Design of hierarchical, three‐dimensional free‐standing single‐atom electrode for H2O2 production in acidic media. Issue 2 (21st February 2020) - Zhang, Jincheng
Abstract: Electrochemical reduction of molecular O2 to hydrogen peroxide (H2 O2 ) offers a promising solution for water purification and environmental remediation. Here, we design a hierarchical free‐standing single‐Co‐atom (with Co–N4 coordination) electrode for oxygen reduction reaction (ORR) via a two‐electron pathway to make H2 O2 in acidic media. The current density of the single‐Co‐atom electrode reached 51 mA/cm 2 at 0.1 V vs reversible hydrogen electrode, lasting for more than 10 hours of continuous operation with H2 O2 selectivity greater than 80%. Toward practical application, the single‐Co‐atom electrode was directly used to assemble an electrochemical cell to produce H2 O2 at a rate of 676 mol/kgcat /h with a cell voltage of about 1.6 V. Abstract : Hierarchical, three‐dimensional free‐standing single‐Co‐atom electrode shows high activity, selectivity, and stability for H2 O2 production in acidic media, and was directly used to assemble an electrochemical cell to produce H2 O2 at a rate of 676 mol/kgcat /h with a cell voltage of about 1.6 V.