KOH-treated reduced graphene oxide: 100% selectivity for H2O2 electroproduction

H2O2 is an important chemical widely used in paper, textile, water treatment and other fields, while the current industrial anthraquinone pathway is not sustainable. Herein, a highly efficient electrocatalyst, reduced graphene oxide (rGO(-KOH)), applied for electrochemical H2O2 production was obtained by treating graphene oxide (GO) with KOH aqueous solution. Compared to KBH4-treated reduced graphene oxide (rGO(-KBH4)) made by KBH4 reduction method, rGO(-KOH) has more ether bonds (C-O-C) on the surface and a larger electrochemically active surface area. Benefiting from these advantages, rGO(-KOH) exhibits enhanced selectivity (similar to 100%) and mass activity for the oxygen reduction reaction through a two-electron pathway (ORR-2e) than rGO-KBH4. Meanwhile, rGO(-KOH) also shows the excellent durablity for (ORR-2e) in alkaline media. Thus, rGO(-KOH) may be an ideal electrocatalyst for H2O2 electroproduction. (C) 2019 Elsevier Ltd. All rights reserved.