Amorphous CoB nanoarray as a high-efficiency electrocatalyst for nitrite reduction to ammonia

Amorphous CoB nanoarray is a high-efficiency catalyst for electrocatalytic NO 2 − -to-NH 3 conversion, capable of attaining a large NH 3 yield of 233.1 μmol h −1 cm −2 and a high faradaic efficiency of 95.2% at −0.7 V in 0.1 M Na 2 SO 4 with 400 ppm NO 2 − .