High-performance NH3 production via NO electroreduction over a NiO nanosheet array

Abstract

Electrocatalytic NO reduction controls NO emission and produces NH₃ under ambient conditions. Herein, a NiO nanosheet array on titanium mesh is proposed as a highly active and selective electrocatalyst for NO reduction, attaining a faradaic efficiency of up to 90% with a NH₃ yield of 2130 μg h⁻¹ cm⁻². Its aqueous Zn–NO battery can generate electricity with a power density of 0.88 mW cm⁻² and simultaneously offer an NH₃ yield of 228 μg h⁻¹ cm⁻². The NO electroreduction mechanism on NiO is revealed using theoretical calculations.