The electrosynthesis of cyclohexanone oxime (CHO) from NO is significant but suffers from low Faradaic efficiency (FE) due to the severe competitive NO*-NO* coupling at high NO concentrations. Here, a facet-regulation strategy is proposed to accelerate the NO hydrogenation process and inhibit NO*-NO* coupling. As a result, the Ag nanocubes with 100 surfaces exhibit an 86. 5% FE, a 4. 45 mmol h-1 cm-2 yield rate, and a 358 mA cm-2 CHO partial current density, outperforming Ag nanohexahedrons with exposed 111 surfaces. Experimental and theoretical research has shown that stronger NO and H2O adsorption and lower thermodynamic and kinetic barriers of hydrogenation of NO* to NHO* over the 100 surface promote hydrogenation of NO* to NHO*, the key step that determines the CHO or NO*-NO* coupling products. Thus, NO*-NO* coupling is restrained, and a high CHO FE is achieved on Ag with a 100 surface.
Liu et al. (Mon,) studied this question.