High-performance NH₃ production <i>via</i> NO electroreduction over a NiO nanosheet array

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.