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Role of oxide support in electrocatalytic nitrate reduction on Cu

O. Quinn Carvalho, Sophia R.S. Jones

2020enelectrocatalysisnitrate reductionoxide supportcopperenvironmental engineering

Abstract

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The electrochemical nitrate reduction reaction (NO3RR) holds promise for distributed water treatment and renewable chemical synthesis, with Cu emerging as an effective monometallic electrocatalyst in both acidic and alkaline environments. However, the activity is constrained by the reduction of adsorbed nitrate to nitrite. This study investigates the role of oxygen-vacancy forming metal-oxide supports in enhancing the NO3RR by comparing the electrochemical activity of Cu on cerium dioxide (Cu/CeO2‑δ) and fluorine-doped tin dioxide (Cu/FTO) against a Cu foil benchmark. Conducted in phosphate-buffered neutral media, the experiments reveal that nitrate and adsorbed hydrogen compete for surface sites, affecting the NO3RR performance. Notably, the Cu/CeO2‑δ configuration shows a less-cathodic overpotential than Cu/FTO, attributed to stronger nitrate adsorption, which parallels thermal nitrate reduction behavior. Furthermore, the use of CeO2‑δ as an electrocatalyst support slightly favors the formation of more oxidized products due to increased nitrate affinity or dynamic processes involving the formation and healing of oxygen vacancies (𝑣𝑂••). These findings highlight that supporting catalysts on metal oxides can enhance electrocatalytic activity by promoting the adsorption of anionic reactants on cathodic surfaces.

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Cite This Work

@article{a2ebbfd7-31bf-4c57-aac9-b83f15065299,
  title={Role of oxide support in electrocatalytic nitrate reduction on Cu},
  author={O. Quinn Carvalho and Sophia R.S. Jones},
  year={2020},
  language={en}
}
TY  - JOUR
TI  - Role of oxide support in electrocatalytic nitrate reduction on Cu
AU  - O. Quinn Carvalho
AU  - Sophia R.S. Jones
PY  - 2020
LA  - en
ER  -

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