Wu Yuhan, Zhao Yuying, Yuan Qixin, Sun Hao, Wang Ao, Sun Kang, Waterhouse Geoffrey I N, Wang Ziyun, Wu Jingjie, Jiang Jianchun, Fan Mengmeng
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210037, China.
Key Lab of Biomass Energy and Material, Jiangsu Province; Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, 210042, China.
Nat Commun. 2024 Dec 30;15(1):10843. doi: 10.1038/s41467-024-55071-7.
Carbon nanomaterials show outstanding promise as electrocatalysts for hydrogen peroxide (HO) synthesis via the two-electron oxygen reduction reaction. However, carbon-based electrocatalysts that are capable of generating HO at industrial-level current densities (>300 mA cm) 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 (B-C) with HO production rates of industrial relevance in neutral or alkaline media. B-C maintained > 95% Faradaic efficiency during a 140-hour test at 300 mA cm and 0.1 V vs. RHE, and delivered a mass activity of 25.1 mol g h in 1.0 M NaSO 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. B-C outperforms all metal-based and metal-free carbon catalysts reported to date for HO synthesis at industrial-level current densities.
碳纳米材料作为通过两电子氧还原反应合成过氧化氢（HO）的电催化剂显示出巨大的潜力。然而，能够在工业级电流密度（>300 mA cm）下以高选择性和长期稳定性生成HO的碳基电催化剂仍有待发现。在此，将少层硼纳米片原位引入多孔碳基质中，制备出一种无金属电催化剂（B-C），其在中性或碱性介质中具有与工业相关的HO生成速率。在相对于可逆氢电极（RHE）为300 mA cm和0.1 V的条件下进行140小时测试期间，B-C保持>95%的法拉第效率，并使用流通池在1.0 M NaSO中实现了25.1 mol g h的质量活性。理论模拟和实验研究表明，优异的催化性能源于硼纳米片中吸附有O原子的B原子。在工业级电流密度下，B-C在HO合成方面优于迄今为止报道的所有金属基和无金属碳催化剂。
