Electrodeposited Ni‐Mo‐P nanoparticles on TiO2 nanoribbon array for electrocatalytic ammonia synthesis by reducing nitrite

Electrocatalytic reduction of six-electron nitrite (NO2−) to NH3 is a very promising avenue for the effective removal of widespread nitrite from groundwater and the generation of high-value-added products. Herein, we investigated Ni–Mo–P nanoparticles decorated TiO2 nanoribbon arrays as an efficient NO2−RR catalyst. Tested in 0.1 M NaOH with 0.1 M NO2−, a high NH3 yield of 16124.8 μg h−1 cm−2 and an ultrahigh faradaic efficiency of 95.6% at −0.6V can be achieved. The excellent catalytic performance of Ni–Mo–P/TiO2 can be attributed to the synergistic effect of Ni–Mo–P and TiO2 heterojunction, together with abundant active sites. In addition, the Zn–NO2− battery with Ni–Mo–P/TiO2 as the anode exhibits excellent battery performance, its power density can reach 6.0 mW cm−2, and a large amount of NH3 can be produced while generating electricity.