Electrodeposition of Cu on NiCo2O4 nanoarrays for efficient electrochemical nitrate reduction to ammonia

Abstract

For electrochemical nitrate reduction to ammonia, non-noble metal-based catalysts with excellent performance are highly desirable. Herein, a Cu–NiCo₂O₄ electrocatalyst was constructed by facile electrodeposition of Cu on NiCo₂O₄. When performed in alkaline solution, Cu–NiCo₂O₄ achieved a high NH₃ yield of 3.56 mmol h⁻¹ cm⁻² and NH₃ faradaic efficiency of 95.2% at −0.2 V vs. RHE.