A hierarchical monolithic cobalt-single-atom electrode for efficient hydrogen peroxide production in acid

Abstract

The oxygen reduction reaction (ORR) through a 2e⁻ pathway offers a feasible solution for hydrogen peroxide (H₂O₂) production and on-site application. However, most present catalysts are powders and exhibit low activity and selectivity. Herein, we report a monolithic cobalt-single-atom electrode for synthesis of H₂O₂. The electrode has a H₂O₂ selectivity of above 80% from 0.3 V to 0.7 V vs. RHE in 0.1 M HClO₄. A flow cell with this electrode as the cathode is demonstrated and yields H₂O₂ at a rate of 606 mmol g_cat⁻¹ h⁻¹ at −1.6 V.