Enhanced Catalytic Performance in Two-Electron Oxygen Reduction Reaction via ZnSnO₃Perovskite

Effective design of high-performance electrocatalysts for the green synthesis of hydrogen peroxide (H₂O₂) by a two-electron oxygen reduction reaction (2e-ORR) method is of vital importance in various applications, but it is still a great challenge for the electrocatalysis community after all of these years. In this work, a novel ZnSnO₃perovskite is prepared as a highly selective and stable catalyst for the electrosynthesis of H₂O₂via 2e-ORR. Profiting from its perovskite-type structure, it presents excellent electrochemical activity toward 2e-ORR in an alkaline electrolyte, and correlated H₂O₂selectivity can reach 76%. Additionally, the H₂O₂selectivity of ZnSnO₃perovskite in 2e-ORR can be steadily maintained for 6 h in a durability test, and the production of H₂O₂synthesis achieves a total amount of 78 mmol·g_cat^-1·h^-1at 0.1 V. Impressively, ZnSnO₃perovskite delivers a preferable turnover frequency (TOF) of 1.31 × 10^-3s^-1compared to the commercial Pt/C catalyst (0.05 × 10^-3s^-1) under the same conditions, demonstrating the great applicable potential of ZnSnO₃perovskite as an active non-noble metal oxide electrocatalyst for 2e-ORR. From the view of catalytic essence, the high electrochemical performance of ZnSnO₃perovskite in 2e-ORR originates from the suitable adsorption capacity on its surface for the adsorption of important *OOH intermediates according to the theoretical calculations. Therefore, ZnSnO₃perovskite as the efficient 2e-ORR catalyst is a promising candidate for the green synthesis of hydrogen peroxide.