School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai, 200093, P. R. China.
Department of Materials Science, Fudan University, Shanghai, 200433, P. R. China.
Small. 2022 Nov;18(47):e2203588. doi: 10.1002/smll.202203588. Epub 2022 Oct 26.
Mild construction of highly efficient and durable practical electrodes for overall water splitting (OWS) at industrial-grade current density is currently a significant challenge. Herein, metal-organic framework (MOF) materials are grown in situ on the surface of carbon cloth (CC) at 25 °C, and quickly "interspersed" by cobalt-boron (Co-B) via electroless plating for 30 min to obtain a highly efficient and stable CoB@MOF@CC self-supporting electrode. Owing to the large specific surface area, abundant active sites, and porous structure, the MOF-based CC modified by bamboo leaf-like ultrathin CoB has remarkable electrochemical catalysis efficiency. The CoB@MOF@CC electrode exhibits excellent performance during the hydrogen evolution reaction (η = 57 mV, η = 266 mV) and oxygen evolution reaction (η = 209 mV, η = 423 mV) in alkaline simulated seawater, and is durable for 2500 h at 500 mA cm . The OWS performance is obviously enhanced by employing the prepared electrode, which only requires 1.49 V to achieve 10 mA cm and is durable for over 360 h at industrial-grade current densities in alkaline high-salt, real seawater, rainwater, and urea electrolytes.
温和构建高效且耐用的实用电极以在工业电流密度下实现全水分解（OWS）是当前的一项重大挑战。在此，在 25°C 下，金属有机骨架（MOF）材料原位生长在碳纤维布（CC）表面，并通过化学镀在 30 分钟内快速“穿插”钴-硼（Co-B），从而获得高效且稳定的 CoB@MOF@CC 自支撑电极。由于具有较大的比表面积、丰富的活性位点和多孔结构，由竹叶状超薄 CoB 修饰的基于 MOF 的 CC 具有显著的电化学催化效率。CoB@MOF@CC 电极在碱性模拟海水中的析氢反应（η = 57 mV，η = 266 mV）和析氧反应（η = 209 mV，η = 423 mV）中表现出优异的性能，在 500 mA cm 下可稳定运行 2500 小时。采用所制备的电极可明显增强 OWS 性能，其仅需 1.49 V 即可达到 10 mA cm，并且在碱性高盐、真实海水、雨水和尿素电解液中在工业电流密度下可持续运行超过 360 小时。
