Nickel

Solvent extraction design consideration for the Tati Activox® plant

ROBLES, E., CRONJE, I.

The Activox® process, developed by Norilsk Process Technology, presents a hydrometallurgical solution for the treatment of diverse metal sulphide concentrates. This paper outlines the development and implementation of the Tati Activox® Project (TA®P), which began in 1998 and has progressed from laboratory scale testing in Australia to the successful operation of a demonstration plant in Botswana.

Solvent extraction test work to evaluate a Versatic 10/Nicksyn™ synergistic system for nickel-calcium separation

René du Preez, Marthie Kotze

This paper discusses the development and optimization of a synergistic solvent extraction system utilizing Versatic 10 and Nicksyn™ to improve the separation of nickel from calcium and magnesium in the hydrometallurgical processing at Tati Nickel in Botswana. The objective was to enhance nickel recovery while minimizing the co-loading of calcium, which can lead to gypsum formation in the extractio

The evolution of crevice corrosion damage on the Ni–Cr–Mo–W alloy-22 determined by confocal laser scanning microscopy

P. Jakupi, J.J. Noël

Crevice corrosion of alloy-22 was studied galvanostatically (10–200lA) at 120°C–176°C in 5 M NaCl. Corrosion damage was analyzed by confocal laser scanning microscopy to obtain penetration profiles. Three-dimensional images demonstrate that damage morphologies varied with applied current. At low applied currents (670 lA), propagation predominantly leads to penetration into the alloy, whereas at hi

EFFICIENCY OF INHIBITORS OF CHLORIDE-INDUCED CREVICE CORROSION OF A Ni-Cr-Mo ALLOY

Mauricio Rincón Ortíz, Martín A. Rodríguez

Alloy 22 was considered as a candidate for the engineered barrier of the USA repository and it is still considered among the candidates in the scoping work for the Argentine repository system. Chloride ion is the only species present in groundwater that is able to promote crevice corrosion, if severe conditions such as high temperatures and a tight crevice are present. Other species present in gro

Investigating the Role of Mo and Cr during the Activation and Passivation of Ni-Based Alloys in Acidic Chloride Solution

Jeffrey D. Henderson, Xuejie Li

The elemental dissolution behaviour of commercially available Ni-based alloys was investigated in the context of surface activation, spontaneous passivation, and electrochemically-assisted passivation in hydrochloric acid solution using atomic emission spectroelectrochemistry (AESEC). Following surface activation, the spontaneous passivation of each alloy was found to proceed by the accumulation o

Effect of environmental variables and main alloying elements on the repassivation potential of Ni–Cr–Mo–(W) alloys 59 and 686

Edgar C. Hornus, Martín A. Rodríguez

Chloride-induced crevice corrosion (E_R,CREV) of alloys UNS N06059 and UNS N06686 was studied at different temperatures in 0.1, 1 and 10 M chloride solutions. Crevice corrosion occurred several degrees below the reported critical crevice temperatures obtained through standard immersion tests. The repassivation potential of the tested alloys as a function of temperature and chloride concentration w

On the Role of Dilution on Selective Hyd

Mostafa Aghazadeh Ghomi, Javad Moghaddam

This paper introduces and discusses some potential effects of dilution in aqueous precipitation processes. The response of a sulfate solution comprising of 0.3 mol L-1 Zn and 0.015 mol L-1 Ni diluted with NaOH solution has been simulated. Considerable changes in separation pH, separation potential, and precipitating minerals have appeared after dilution. An increase in separation pH from 6.86 to 7

Enhanced selectivity of hydrolytic preci

Mostafa Aghazadeh-Ghomi, Javad Moghaddam

The selective precipitation of zinc from zinc−nickel sulfate solution with a Zn/Ni molar ratio of 20:1 was studied. Dropwise addition of 0.5 mol/L NaOH solution into the zinc−nickel sulfate solution containing varying concentrations of ethylene diamine tetraacetate (EDTA), a chelating agent, was employed. The equilibrium analysis of the precipitation pathway was performed using the Visual MINTEQ p

Simultaneous Solvent Extraction of Co and Ni from Copper Raffinate Waste Solution

Hanieh Rezaei, Mohammad Reza Aboutalebi

The extraction and stripping of Co, Ni, Mn, and Mg ions from raffinate solution of the Sarcheshmeh copper complex containing Cu (0.14 g/L), Ni (0.15 g/L), Co (0.06 g/L), Fe (10.72 g/L), Zn (2.4 g/L), Mn (4.83 g/L), and Mg (8 g/L) was comprehensively studied using D2EHPA and LIX 984 extractants. To design the solvent extraction experiments, the response surface method (RSM) was employed. The optima

MÉTALLURGIE EXTRACTIVE : NICKEL

AMANDA SAYURI DE SOUZA NAKATA, EDUARDO WILYAM PEREIRA LIMA

Cette étude aborde les différents procédés d'extraction métallurgique du nickel, en mettant l'accent sur les méthodes appliquées dans le contexte brésilien. L'objectif principal est d'explorer et d'analyser les techniques de production de concentrés de nickel à partir de minerais sulfureux, tout en considérant les aspects environnementaux associés. La méthodologie consiste à examiner les processus

Recent Improvements at the BCL Smelter

M.T. Malema, A.C. Legg

BCL Limited operates the only Flash Smelting Furnace on the African continent, located in Selebi-Phikwe, north-eastern Botswana. This paper aims to outline the recent improvements and expansions achieved at the BCL smelter, specifically focusing on the enhancements that have enabled an increase in production capacity from 40,000 to 60,000 tons per annum of high-grade sulphide matte containing nick

Selective Separation and Recovery of Ni, Cu and Cr from Electroplating Sludge via Hydrometallurgical Processes

Suhyeon Lee, In-Hyeok Choi

To produce high-purity nickel sulfate from nickel-bearing sludge generated in electroplating processes, this study evaluated a three-step hydrometallurgical pretreatment and purification process comprising sulfuric acid leaching, cementation, and neutralization–precipitation. In the leaching step, the application of 1–2 M H2SO4 at a 25 w/v% solids content achieved near-quantitative dissolution (≥

2026 Soyoz MCrAlY Hot Corrosion

Sercan Soyöz, Cevat Sarıoğlu

This research was carried out to improve type-I hot corrosion resistance of MCrAIY-type coatings with modifying chromium (Cr) and cobalt (Co) contents under Na2SO4 salt film at 900 °C and re-evaluate the effects of Cr and Co elements on type-I hot corrosion. To evaluate hot corrosion performance, weight change versus time graphs were plotted by tracking changes in sample, total and spallation weig

Selective extraction of nickel cobalt and copper 2026 Separation and Purifi

Wen Li, Junnan Lu

Solvent extraction behaviour of nickel, cobalt and copper from ammonia – glycine alkaline solutions using ketoxime extractant LIX ® 84-IC was systematically investigated. Extraction kinetics, pH-dependent selectivity, equilibrium isotherms and multistage extraction performance were evaluated using single-metal and multi-component simulated pregnant leach solutions (PLS). Kinetic studies revealed t

Loss behavior of Ni and Co during Al and Sc enri 2025 Transactions of Nonfer

Jian-cheng YU, Bao-zhong MA

The loss pathways of Ni and Co during Al and Sc enrichment were analyzed in the HNO3 leach liquor of saprolitic laterite ore. Although over 99% of Al and Sc can be enriched, about 40% of Ni and Co are also lost. The adsorption of Al−Sc precipitate is an important cause of Ni and Co loss. Subsequently, the precipitation behavior of metal ions in different nitrate solutions was studied. The results

2026 Acquah Nickel Cobalt Extraction from Lateritic Ores

Gertrude Acquah, William Skinner

The accelerating transition to low carbon energy systems has intensified the demand for nickel and cobalt from low-grade (<1.5 wt.%) refractory lateritic ores. This study aims to address the challenges and explore opportunities in the extraction of these metals from complex low-grade ores. We employed a combination of selective comminution-classification, mechanical activation through stirred-medi

Selective Co/Ni Separation in Sulfate Media by Continuous Counter‑Current Membrane‑Assisted Solvent Extraction

Kurniawan Kurniawan, Aude Hubaud Heidet

A continuous counter-current membrane-assisted (CCCMA) extractor used wettable membranes (hydrophobic or hydrophilic properties) to separate organic and aqueous phases. In this study, the CCCMA extractor was evaluated as an alternative to conventional gravity-based phase-disengagement mixer-settlers for solvent extraction (SX) of critical metals, targeting cobalt (Co) and nickel (Ni). The performa

Selective Extraction of Nickel and Cobalt from Limonitic Laterite via Optimized Sulfation Roasting–Water Leaching and Solvent Extraction

Maryam Osali, Farid Ahani

Limonitic laterites typically contain low Ni and Co contents and significant impurities, making the development of technical and economically feasible processes challenging. To address this challenge, this study investigates and evaluates an integrated hydrometallurgical process comprising sulfation roasting, water leaching, and solvent extraction (SX) for the selective recovery of Ni and Co from

Optimizing heap leaching of complex sulphide ores Fe Ni 9S8 C 2026 Mineral

Joseph Kolela Nyembwe, Christian Ekberg

Fluidized Bed Selective Oxidation-Sulfation Roasting of Nickel Sulfide Concentrate: Part I. Oxidation Roasting

Dawei Yu, Torstein A. Utigard

Two-stage oxidation-sulfation roasting of nickel sulfide concentrate in fluidized bed was investigated to generate water-soluble metal sulfates as an alternative process to smelting of the sulfide concentrate for the recovery of valuable metals. The first stage, i.e. oxidation roasting, was employed to preferentially oxidize the iron before performing sulfation roasting. A batch fluidized bed roas

High-Performance Recovery of Cobalt and Nickel from the Cathode Materials of NMC Type Li-Ion Battery by Complexation-Assisted Solvent Extraction

Wen-Yu Wang, Hong-Chi Yang

The annual global volume of waste lithium-ion batteries (LIBs) has been increasing over years. Although solvent extraction method seems well developed, the separation factor between cobalt and nickel is still relatively low—only 72 when applying conventional continuous-countercurrent extraction. In this study, we improved the separation factor of cobalt and nickel by complexation-assisted solvent

Aerobic Bioleaching of Six Brazilian Laterite Ores with Acidithiobacillus thiooxidans, Sulfobacillus species and Archaea at Various Conditions

Stefanie A. Hetz, Axel Schippers

Biohydrometallurgical laterite processing was explored at laboratory scale in this study. The extraction of nickel, cobalt, and other metals from six different laterite ores from three Brazilian deposits was tested via bioleaching in 2 L stirred tank reactors under aerobic conditions with acidophilic, sulfur-oxidizing bacteria and archaea. The experiments were run with three different mixed cultur

Utilization of Converter Slag from Nickel Production by Hydrometallurgical Method

Alexander G. Kasikov, Elena A. Shchelokova

The possibility of hydrometallurgical processing of converter slag from nickel production aimed at integrated use of mineral raw materials and environmental protection is shown. The scheme of hydrometallurgical processing of slag using hydrochloric acid is proposed. The method involves leaching the slag with hydrochloric acid in the presence of ferric ions. The high values of iron and nonferrous m

Ferric Sulfate Leaching of Pyrrhotite Tailings between 30 to 55 °C

Nazanin Samadifard, Cheryl E. Devine

Mine tailings present major environmental issues in the mining industry. However, due to the depletion of high-grade sulfide ores for metal recovery, tailings could also be a potential resource for certain valuable metals. The present study investigates the potential to recover nickel from pyrrhotite tailings. Leaching tests were performed in acidic ferric sulfate media with 0.14 wt % solids to ke

Iron Control in Atmospheric Acid Laterite Leaching

Ville Miettinen, Jarno Mäkinen

Iron control in the atmospheric acid leaching (AL) of nickel laterite was evaluated in this study. The aim was to decrease acid consumption and iron dissolution by iron precipitation during nickel leaching. The combined acid leaching and iron precipitation process involves direct acid leaching of the limonite type of laterite followed by a simultaneous iron precipitation and nickel leaching step.

INVESTIGATION INTO THE LEACHING KINETICS AND MECHANISM OF NICKEL EXTRACTION FROM ASBESTOS TAILINGS VIA NITRIC ACID TREATMENT

Omirserik Baigenzhenov, Assel Dagubayeva

This study presents the results of an investigation into the kinetics of nitric acid leaching of nickel from the magnetic fraction of chrysotile asbestos beneficiation waste. The relevance of this work stems from the necessity to involve large-tonnage technogenic formations into processing circuits. It was established that the application of magnetic separation enables preliminary concentration of

Low-Temperature CO2-Enhanced Reductive Bioleaching for Selective Nickel Recovery from Iron-Rich Silicate Tailings, with Concurrent Carbon Sequestration

Kwabena Boafo, Palas Kamlakar Borkar

Recovering nickel from iron-rich mine tailings by bioleaching is held back by the co-dissolution of iron, which gives pregnant leach solutions with high Fe/Ni mass ratios and heavy downstream purification costs. This study shows that running bioleaching at 0 °C under a CO2-enriched atmosphere, with no post-leach iron removal step, lowers the Fe/Ni mass ratio in the leachate from 13.87 at 25 °C to

Evaluation of an unsymmetrical dialkylphosphinic acid INET-3 for cobalt and nickel extraction and separation from sulfate solutions

Jiashuai Fu, Wen Xu

Cobalt and nickel are important strategic resources. Solvent extraction is an efficient way to separate and recover cobalt and nickel from spent batteries like ternary LIBs, NiMH, and Ni-Cd batteries. In this paper, we introduce an unsymmetrical dialkylphosphinic acid INET-3 – which possesses excellent extraction and separation performance for heavy REEs – to cobalt/nickel separation for the first

ROASTING REDUCTION STUDY OF GREEK NICKELIFEROUS LATERITES

Emmanuel N. Zevgolis, Charalabos Zografidis

In the present work, a reduction roasting experimental study of Greek nickeliferous laterite samples with a gaseous reducing mixture – CO:N2- is presented. The effect of parameters such as temperature, ore grain size, and composition of the reducing mixture were examined. It is deduced that the reducibility of intermediate type laterite sample, where iron appears mainly in the form of goethite (α-

The Direct Leaching of Nickel Sulfide Flotation Concentrates – A Historic and State-of-the-Art Review Part I: Piloted Processes and Commercial Operations

Nebeal Faris, Mark I. Pownceby

The extraction of nickel (Ni) from sulfide resources commences with flotation to produce a concentrate which is then smelted to create a nickel-enriched phase called matte, further refined to produce pure Ni products along with by-products such as cobalt (Co), copper (Cu), and precious metals. Despite the technological robustness of the traditional concentrate smelting-matte refining process, it i

Establishment of a Hydrometallurgical Scheme for the Recovery of Copper, Nickel, and Cobalt from Smelter Slag and Its Economic Evaluation

Labone Lorraine Godirilwe, Kazutoshi Haga

In pursuit of carbon neutrality, the demand for metals that are necessary for the development of clean energy technologies is rapidly increasing. Metallurgical waste, such as slag, presents a promising secondary source of these key metals. This research aims to develop an eco-friendly hydrometallurgical process to recover Cu, Ni, and Co from discarded copper/nickel slag. High-pressure acid leachin

Field-Selective Adsorption of Saccharin on Nickel: Mechanistic DFT Insights into Solvation, Protonation, and Coating Morphology

Aylar G. M. Ghashghaei, Mahboubeh Khorrami

The molecular mechanisms by which organic additives such as saccharin control microstructure in nickel electrodeposition remain inadequately understood, particularly the role of the intense interfacial electric field. This study employs density functional theory (DFT) calculations to elucidate the field dependent adsorption behavior of neutral saccharin and its deprotonated anion (saccharinate) on

Characterization of a Nickel Sulfide Concentrate and Its Implications on Pentlandite Beneficiation

Linda D. Ayedzi, Massimiliano Zanin

In anticipation of future demands, a comprehensive understanding of the chemical and mineralogical characteristics of nickel-bearing minerals is a prerequisite to devising effective nickel beneficiation methods. Of particular importance are markers in the mineralogy of the flotation concentrate that inform beneficiation strategies to improve concentrate grades, increasing both the marketability an

2014 Saka Nitric acid leaching of nickel and cobalt laterites

Onur Saka

This thesis study is related to the extraction kinetics of nickel and cobalt from lateritic nickel ores from the Gördes/Manisa region of Turkey. The experimental studies involved the optimization of the extraction process using nitric acid as the leaching agent. Various parameters affecting the extraction efficiency were systematically investigated, and the results indicated significant variabilit

Reaction Sequences in Flash Smelting and Converting Furnaces: An In-depth View

PEKKA TASKINEN, ARI JOKILAAKSO

Flash smelting and flash converting have established themselves as key technologies in the processing of copper and nickel sulfide ores, reflected in the high online availability, yield efficiency, and low energy requirements. This study addresses the operational intricacies linked to furnace design and maintenance, emphasizing the interconnectedness of suspension oxidation, fluxing, fluid dynamic

Factors Affecting the Upgrading of a Nickeliferous Limonitic Laterite Ore by Reduction Roasting, Thermal Growth and Magnetic Separation

Filipe Rodrigues, Christopher A. Pickles

There is considerable interest in the development of new processes to extract the nickel from the oxidic nickeliferous laterite deposits, as the global nickel sulphide resources are rapidly becoming more difficult to access. In comparison to sulphide ores, where the nickel-containing mineral can be readily concentrated by flotation, nickel laterites are not amenable to significant upgrading, due t

Optimal Combination of Calcination and Reduction Conditions as well as Na2SO4 Additive for Carbothermic Reduction of Limonite Ore

Guan-Jhou Chen, Jia-Shyan Shiau

The optimal carbothermic reduction parameters of limonite ore and the influence of calcining temperature on these were investigated. In addition, the impact of the addition of Na2SO4 on limonite ore which had been calcined before reduction at optimal carbothermic conditions was also examined. Various analytical techniques including XRD analysis, BET-specific surface area analysis, bromine methyl a

Pyrometallurgical Methods for Processing Lateritic Nickel Ores and Evaluation of Their Application for Processing Nickel Ores in Kazakhstan: A Review

Yerbol Shabanov, Yerlan Zhumagaliyev

The depletion of global reserves of high-quality sulfide nickel deposits, coupled with the steady growth of nickel demand, has led to increased interest in the processing of oxidized (lateritic) nickel ores, including deposits with significant resource potential in the Republic of Kazakhstan. This paper provides an overview of global nickel ore reserves and their distribution, as well as the major

EXTRACTION OF NICKEL AND COBALT FROM LATERITIC ORES BY NITRIC ACID

Onur Saka

This thesis study is related to the extraction kinetics of nickel and cobalt from lateritic nickel ores from the Gördes/Manisa region of Turkey. The experimental studies involved the optimization of extraction conditions using nitric acid as the leaching agent. The research aimed to evaluate the efficiency of metal extraction and to establish the optimal conditions for the maximum recovery of nick

Processing of Waste Copper Converter Slag Using Organic Acids for Extraction of Copper, Nickel, and Cobalt

Pratima Meshram, Uday Prakash

An innovative, economical, and environmentally sound hydrometallurgical process has been proposed for recovering Cu, Ni, and Co from copper-rich converter slag by organic acids. In the leaching experiments, the effects of organic acid concentrations, pulp density, temperature, and time were investigated. Optimum recovery of 99.1% Cu, 89.2% Ni, 94% Co, and 99.2% Fe was achieved in 9–10 h at 308 K (

PRESSURE LEACHING OF ÇALDAĞ LATERITIC NICKEL ORE

Mehmet Ali Recai Önal

This thesis explores the pressure leaching process for extracting nickel from Çaldağ lateritic nickel ore, aiming to enhance the efficiency and effectiveness of metal recovery. The objective focuses on optimizing the operational parameters such as temperature, pressure, and acidity levels to achieve higher nickel yields. A systematic experimental approach was employed, utilizing a series of labora

Thermodynamics of the Reduction Roasting of Nickeliferous Laterite Ores

R. Elliott, C. A. Pickles

The global nickel sulphide resources are becoming more difficult to mine and, as a result, there is increasing interest in the current and future development of the oxidic nickel laterite deposits. In comparison to the sulphide ores, the nickel laterites cannot be readily upgraded by conventional means, and growing attention is being focused on the development of new methods for processing these o

An Investigation of High-Temperature Precipitation in Powder-Metallurgy, Gamma/Gamma-Prime Nickel-Base Superalloys

S.L. SEMIATIN, S-L. KIM

The high-temperature-precipitation behavior of a typical powder-metallurgy, gamma-gamma-prime, nickel-base superalloy (LSHR) was determined to develop and validate a quantitative fast-acting model. A series of experiments including supersolvus solution treatment followed by continuous cooling at rates typical of those experienced during the manufacturing of full-scale components was conducted for

The Prospect of Recovering Vanadium, Nickel, and Molybdenum from Stone Coal by Using Combined Beneficiation and Metallurgy Technology Based on Mineralogy Features

Miao Wang, Liulu Cai

Black shale ore contains rich strategic metal resources such as vanadium, nickel, and molybdenum, but due to its complex composition, it is currently only used in the vanadium extraction industry. Metals such as nickel and molybdenum have not been effectively recovered, resulting in environmental pollution and resource waste. Using mineralogical features and a combination of beneficiation and meta

Selective cobalt and nickel electrodeposition for lithium-ion battery recycling through integrated electrolyte and interface control

Kwiyong Kim, Darien Raymond

Molecularly-selective metal separations are key to sustainable recycling of Li-ion battery electrodes. However, metals with close reduction potentials present a fundamental challenge for selective electrodeposition, especially for critical elements such as cobalt and nickel. Here, we demonstrate the synergistic combination of electrolyte control and interfacial design to achieve molecular selectiv

Efficient Synchronous Extraction of Nickel, Copper, and Cobalt from Low–Nickel Matte by Sulfation Roasting‒Water Leaching Process

Qiangchao Sun, Hongwei Cheng

This paper investigates an efficient method for extracting nickel (Ni), copper (Cu), and cobalt (Co) from low-nickel matte, addressing the low recovery efficiency typical of traditional pyrometallurgical processes. The objective was to optimize the parameters and mechanisms of sulfation roasting followed by water leaching using sodium sulfate as a sulfating additive. Employing rigorous testing und

Métallurgie Technologie des Batteries Chapitre X : Batteries Nickel-Cadmium (Ni-Cd)

A. B. C, D. E.

Ce chapitre traite de la technologie des batteries nickel-cadmium (Ni-Cd) en mettant l'accent sur le rôle des électrodes et de l'électrolyte dans les processus électrochimiques. L'objectif est de comprendre les mécanismes de charge et de décharge des batteries Ni-Cd, en particulier la fonction de l'électrode positive NiOOH, de l'électrode négative Cd et de l'électrolyte KOH. La méthodologie impliq

REPUBLIQUE DEMOCRATIQUE DU CONGO

n/a

Cet article examine le stockage d'énergie des batteries Li-ion et Ni-MH, ainsi que leurs impacts environnementaux, notamment la toxicité du cadmium. L'objectif est de comparer les méthodes de recyclage des batteries, en mettant l'accent sur la pyrométallurgie et l'hydrométallurgie. La méthodologie inclut l'analyse des demi-réactions de décharge des batteries et des avantages et inconvénients des d

Structural modifications to nickel cermet anodes in fuel cell environments

Douglas G. Ivey, Edward Brightman

Restructuring of Ni in cermet anodes of solid oxide fuel cells (SOFCs) has been studied using both bulk fuel cells and thin foil anodes. The bulk cells were button cells (23 mm in diameter) with cermet anodes (30–70 /H9262m thick) made up of nickel and gadolinium-doped ceria (Ni/CGO). The cells were operated (under current load) at 700◦ C in moist H2 or moist H2 with low levels of H2 S. Scanning e

On the Active Surface State of Nickel-Ceria Solid Oxide Fuel Cell Anodes During Methane Electrooxidation

Vasiliki Papaefthimiou, Maxim Shishkin

Fuel cells are devices that directly convert fuels into electricity, with solid oxide fuel cells (SOFCs) being particularly attractive due to their high efficiency and fuel flexibility. The objective of this study is to provide in situ experimental evidence of the active surface oxidation state and composition of nickel/gadolinium-doped ceria (Ni/GDC) anodes during methane electrooxidation using r

Mathematical modeling of the operation of SOFC Nickel-cermet anodes

D. Presvytes, C. G. Vayenas

A surface diffusion–reaction model is developed and solved to describe the steady-state operation of Nickel-cermet anodes in solid oxide fuel cells. The model accounts for the migration (backspillover) and diffusion of oxygen ions from the solid electrolyte onto the nickel surface and the concomitant reaction with the fuel over a finite reaction zone extending from the three-phase boundaries onto

In situ Reduction and Oxidation of Nickel from Solid Oxide Fuel Cells in a Transmission Electron Microscope

A. Faes, Q. Jeangros

Environmental transmission electron microscopy was utilized to characterize in situ the reduction and oxidation processes of nickel from a Ni/YSZ solid oxide fuel cell anode support within the temperature range of 300-500°C under low hydrogen pressure. The findings indicate that reduction initiates at the NiO/YSZ interface and progresses to the center of the NiO grain, with higher temperatures per

Electrochemical performance of nanocrystalline nickel/gadolinia-doped ceria thin film anodes for solid oxide fuel cells

Ulrich P. Muecke, Kojiro Akiba

Nickel oxide/Ce0.8Gd0.2O1.9 −x (NiO/CGO) films were deposited by spray pyrolysis and pulsed laser deposition on polished CGO electrolyte pellets to analyze their electrochemical performance as anodes in solid oxide fuel cells (SOFCs). The objective was to evaluate the relationship between microstructure and performance of Ni/CGO thin film anodes. The thickness of the as-deposited films ranged from

Design of Active Sites on Nickel in the Anode of Intermediate-Temperature Solid Oxide Fuel Cells using Trace Amount of Platinum Oxides

Andrii Rednyk, Toshiyuki Mori

Solid oxide fuel cells (SOFCs) provide efficient energy conversion but face challenges related to their operating temperature and internal resistance. This study investigates the design of new active sites on nickel surfaces in the anode of intermediate-temperature solid oxide fuel cells (IT-SOFCs) through the deposition of trace amounts of platinum oxide (PtOx), followed by activation in a hydrog

Catalytic activity of bimetallic nickel alloys for solid-oxide fuel cell anode reactions from density-functional theory

Wei An, Brett I. Dunlap

We present density-functional theory calculations of the chemisorption of atomic species O, S, C, H and reaction intermediates OH, SH, and CH n (n = 1, 2, and 3) on M/Ni alloy model catalysts (M = Bi, Mo, Fe, Co, and Cu). The activity of the Ni alloy catalysts for solid-oxide fuel cell (SOFC) anode oxidation reactions is predicted, based on a simple descriptor, i.e., the binding energy of oxygen.

Nickel Electrodeposition on Silver for the Development of Solid Oxide Fuel Cell Anodes and Catalytic Membranes

Zadariana Jamil, Enrique Ruiz-Trejo

Nickel was electrodeposited on porous Ag/GDC (silver/Ce0.9Gd0.1O2-x) scaffolds and dense Ag/GDC composites for the fabrication of solid oxide fuel cell (SOFC) electrodes and catalytic membranes respectively. The objective of this study was to control the distribution and amount of nickel deposition on the Ag/GDC surfaces. A systematic cyclic voltammetry study was performed to understand the influe

Anode fabrication for solid oxide fuel cells: Electroless and electrodeposition of nickel and silver into doped ceria scaffolds

Zadariana Jamil, Enrique Ruiz-Trejo

A novel fabrication method using electroless and electrodeposited Ni/Ag/GDC for SOFC anodes is presented. First a porous Ce0.9Gd0.1O2/C0 x (GDC) scaffold was deposited on a YSZ electrolyte by screen printing and sintering. The scaffold was then metallized with silver using Tollens' reaction, followed by electrodeposition of nickel from a Watt's bath. The electrodes (Ni/Ag/GDC) were tested in both

Zn-Ni ALLOY COATINGS FROM ALKALINE BATH CONTAINING TRIETHANOLAMINE. INFLUENCE OF ADDITIVES.

Liana Maria Muresan, Julien Eymard

The study investigates the electrodeposition of Zn-Ni alloys from an alkaline bath using triethanolamine as a complexing agent for Ni2+ ions. Various brightening agents including polyethylene glycol (PEG), coumarin, piperonal, and vanillin were tested to evaluate their effects on the codeposition process and the corrosion resistance of the resulting coatings. The findings indicate that the electro

Electrodeposition of Zn–Ni coatings as Cd replacement for corrosion protection of high strength steel

A. Conde, M.A. Arenas

Electrodeposition of Zn–Ni coatings performed in acidic baths are not suitable for high strength steels due to their high susceptibility to hydrogen embrittlement. In this work, Zn–Ni coatings were deposited on a high strength steel (4340) upon stirring conditions from an alkaline bath. A complete characterisation of the coatings (corrosion, morphology and composition) has been accomplished, corre

Pulse plating of nickel: influence of electrochemical parameters and composition of electrolyte

M. Halmdienst, W. E. G. Hansal

In this paper, the influence of electrochemical parameters and the composition of the electrolyte on the properties of nickel deposits in pulse plating is discussed. The objective was to investigate how organic additives affect the characteristics and electrochemical behavior of a nickel sulphamate bath, derived from fundamental electrochemical experiments. The methodology involved conducting plat