High-efficiency ammonia synthesis via electrochemical nitrate reduction over Co3O4 nanoarrays by B doping

B acts as an effective dopant to boost the catalytic activity of Co 3 O 4 for the nitrate reduction reaction towards NH 3 synthesis. Such B-Co 3 O 4 /TM achieves a high faradaic efficiency of 94.7% and a large NH 3 yield rate of 407.3 μmol h −1 cm −2 .