High-efficiency electrocatalytic nitrite reduction toward ammonia synthesis on CoP@TiO(2) nanoribbon array

Electrochemical reduction of nitrite (NO(2)(−)) can satisfy the necessity for NO(2)(−) contaminant removal and deliver a sustainable pathway for ammonia (NH(3)) generation. Its practical application yet requires highly efficient electrocatalysts to boost NH(3) yield and Faradaic efficiency (FE). In this study, CoP nanoparticle-decorated TiO(2) nanoribbon array on Ti plate (CoP@TiO(2)/TP) is verified as a high-efficiency electrocatalyst for the selective reduction of NO(2)(−) to NH(3). When measured in 0.1 M NaOH with NO(2)(−), the freestanding CoP@TiO(2)/TP electrode delivers a large NH(3) yield of 849.57 μmol h(−1) cm(−2) and a high FE of 97.01% with good stability. Remarkably, the subsequently fabricated Zn–NO(2)(−) battery achieves a high power density of 1.24 mW cm(−2) while delivering a NH(3) yield of 714.40 μg h(−1) cm(−2).