Electrochemically synthesized H2O2 at industrial-level current densities enabled by in situ fabricated few-layer boron nanosheets

Yuhan Wu, Yuying Zhao, Qixin Yuan, Hao Sun, Ao Wang, Kang Sun, Geoffrey I. N. Waterhouse, Ziyun Wang (), Jingjie Wu (), Jianchun Jiang () and Mengmeng Fan ()
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Yuhan Wu: Nanjing Forestry University
Yuying Zhao: Chinese Academy of Forestry
Qixin Yuan: Nanjing Forestry University
Hao Sun: Chinese Academy of Forestry
Ao Wang: Chinese Academy of Forestry
Kang Sun: Chinese Academy of Forestry
Geoffrey I. N. Waterhouse: The University of Auckland
Ziyun Wang: The University of Auckland
Jingjie Wu: University of Cincinnati
Jianchun Jiang: Chinese Academy of Forestry
Mengmeng Fan: Nanjing Forestry University

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract Carbon nanomaterials show outstanding promise as electrocatalysts for hydrogen peroxide (H2O2) synthesis via the two-electron oxygen reduction reaction. However, carbon-based electrocatalysts that are capable of generating H2O2 at industrial-level current densities (>300 mA cm−2) with high selectivity and long-term stability remain to be discovered. Herein, few-layer boron nanosheets are in-situ introduced into a porous carbon matrix, creating a metal-free electrocatalyst (Bn-C) with H2O2 production rates of industrial relevance in neutral or alkaline media. Bn-C maintained > 95% Faradaic efficiency during a 140-hour test at 300 mA cm−2 and 0.1 V vs. RHE, and delivered a mass activity of 25.1 mol gcatalyst−1 h−1 in 1.0 M Na2SO4 using a flow cell. Theoretical simulations and experimental studies demonstrate that the superior catalytic performance originates from B atoms with adsorbed O atoms in the boron nanosheets. Bn-C outperforms all metal-based and metal-free carbon catalysts reported to date for H2O2 synthesis at industrial-level current densities.

Date: 2024
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DOI: 10.1038/s41467-024-55071-7

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