High-efficiency electroreduction of nitrite to ammonia on a Cu@TiO₂ nanobelt array

Electrochemical nitrite (NO₂^-) reduction is a potential and sustainable route to produce high-value ammonia (NH₃), but it requires highly active electrocatalysts. Herein, Cu nanoparticles anchored on a TiO₂ nanobelt array on a titanium plate (Cu@TiO₂/TP) are reported as a high-efficiency electrocatalyst for NO₂^--to-NH₃ conversion. The designed Cu@TiO₂/TP catalyst exhibits outstanding catalytic performance toward the NO₂^-RR, with a high NH₃ yield of 760.5 μmol h^-1 cm^-2 (237.7 μmol h^-1 mg_cat.^-1) and an excellent faradaic efficiency of 95.3% in neutral solution. Meanwhile, it also presents strong electrochemical stability during cyclic tests and long-term electrolysis.