hide
Free keywords:
-
Abstract:
Electrochemical two-electron oxygen reduction reaction (2 e(-) ORR) to produce hydrogen peroxide (H2O2) is a promising alternative to the energetically intensive anthraquinone process. However, there remain challenges in designing 2 e(-) ORR catalysts that meet the application criteria. Here, we successfully adopt a microwave-assisted mechanochemical-thermal approach to synthesize hexagonal phase SnO2 (h-SnO2) nanoribbons with largely exposed edge structures. In 0.1 M Na2SO4 electrolyte, the h-SnO2 catalysts achieve the excellent H2O2 selectivity of 99.99 %. Moreover, when employed as the catalyst in flow cell devices, they exhibit a high yield of 3885.26 mmol g(-1) h(-1). The enhanced catalytic performance is attributed to the special crystal structure and morphology, resulting in abundantly exposed edge active sites to convert O-2 to H2O2, which is confirmed by density functional theory calculations.
