Electrochemical production of hydrogen peroxide by non-noble metal-doped g-CN under a neutral electrolyte.

Electrochemical oxygen reduction (ORR) for the production of clean hydrogen peroxide (HO) is an effective alternative to industrial anthraquinone methods. The development of highly active, stable, and 2e ORR oxygen reduction electrocatalysts while suppressing the competing 4e ORR pathway is currently the main challenge. Herein, bimetallic doping was successfully achieved based on graphitic carbon nitride (g-CN) with the simultaneous introduction of K and Co, whereby 2D porous K-Co/CNNs nanosheets were obtained. The introduction of Co promoted the selectivity for HO, while the introduction of K not only promoted the formation of 2D nanosheets of g-CN, but also inhibited the ablation of HO by K-Co/CNNs. Electrochemical studies showed that the selectivity of HO in K-Co/CNNs under neutral electrolyte was as high as 97%. After 24 h, the HO accumulation of K-Co/CNNs was as high as 31.7 g L. K-Co/CNNs improved the stability of HO by inhibiting the ablation of HO, making it a good 2e ORR catalyst and providing a new research idea for the subsequent preparation of HO.