▎ 摘　　要

Hydrogen peroxide (H2O2) is a green chemical oxidant that finds widespread use in the chemical industry. The electrocatalytic oxygen reduction reaction (ORR) is presently attracting a lot of attention as an environmentally friendly synthetic route towards H2O2. However, the efficient reduction of O-2 & nbsp;to produce H2O2 & nbsp;at high current densities (> 100 mA cm(-2)), thereby achieving viable H2O2 & nbsp;yields, remains a challenge. Herein, we demonstrate that vertical graphene arrays grown on carbon paper (denoted herein as VG array) via plasma-enhanced chemical vapor deposition show outstanding activity for ORR to H2O2 & nbsp;in alkaline media at high current densities. The VG array electrode delivered a Faradaic efficiency of 94% and a H2O2 & nbsp;production rate of 61.3 mg h(-1)& nbsp;cm(-2) at 100 mA cm(-2), and similarly impressive performance at 200 mA cm(-2)& nbsp;(81% and 102.8 mg cm-2 h(-1), respectively), outperforming most catalysts reported to date for electrochemical H2O2 & nbsp;synthesis. The remarkable performance of the VG array electrode is ascribed to the interconnected network of graphene nanosheets which ensures a high availability of graphene edge active sites (thus a high H2O2 selectivity) and fast electron transfer during ORR. Further, gas-liquid-solid three-phase interfaces formed between the graphene nanosheets facilitate a steady supply of O-2 & nbsp;from the gas phase when the electrode was applied in a flow cell. Results encourage the application array electrodes in electrochemical H2O2 & nbsp;synthesis, whilst also offering a roadmap to future industrial H2O2 & nbsp;production.