Ultra‐low single‐atom Pt on g‐C₃N₄ for electrochemical hydrogen peroxide production

Abstract Platinum‐based materials show excellent electrocatalytic performance and have good potential for use in fuel cells. However, the high cost and scarce reserves have restricted their wide application. Therefore, it is a challenging task to reduce the amount of Pt as well as ensure good catalytic performance. Herein, anchoring of Pt single atoms (0.21 wt‰) with ultra‐low content on g‐C₃N₄ nanosheets (Pt_0.21/CN) has been successfully achieved. The obtained Pt_0.21/CN catalyst shows excellent two‐electron oxygen reduction (2e⁻ ORR) capability for hydrogen peroxide (H₂O₂). Compared with CN, its H₂O₂ selectivity increased from 80% to 98% in 0.1 M KOH, surpassing those in most of the reported studies. Besides, the H₂O₂ production rate of Pt_0.21/CN is 767 mmol g_cat⁻¹ h⁻¹, which is 11.1 times that of CN. This work may pave the way toward the development of an effective method for the design of noble‐metal electrocatalysts with low metal loading and high catalytic activity.