Ambient electrochemical NH3 synthesis from N2 and water enabled by ZrO2 nanoparticles

Industrially, artifical N-2 fixation to NH3 mainly relies on the Haber-Bosch process which is operated in a harsh environment with large energy consumption and heavy serious greenhouse gas emission. Electrochemical N-2 reduction offers a carbon-neutral and energy-saving method for NH3 synthesis under ambient conditions. Herein, we demonstrate the first use of ZrO2 nanoparticles as an earth-abundant electrocatalyst for NH3 synthesis from N-2 and water under ambient conditions. In 0.1 M HCl, the electrocatalyst presents a large NH3 yield rate of 24.74 mu g h(-1) mg(cat.)(-1) with a faradaic efficiency of 5.0% at -0.45 V vs. the reversible hydrogen electrode. It also demonstrates high electrochemical stability and excellent selectivity for NH3 generation.