Mild Construction of "Midas Touch" Metal–Organic Framework‐Based Catalytic Electrodes for Highly Efficient Overall Seawater Splitting. Issue 47 (26th October 2022)

• Record Type: Journal Article
• Authors: Fan, Jinli; Fu, Chengyu; Liang, Rikai; Lv, Haiyang; Fang, Chaosong; Guo, Yanhui; Hao, Weiju
• Is Part Of: Small. Volume 18:Issue 47(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-26
• Subjects: alkaline simulated seawater -- interspersion effect -- metal–organic frameworks -- mild electroless plating -- transition metal borides; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202203588
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: 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 (η10 = 57 mV, η500 = 266 mV) and oxygen evolution reaction (η10 = 209 mV, η500 = 423 mV) in alkaline simulated seawater, and is durable for 2500 h at 500 mA cm −2 . The OWS performance is obviously enhanced by employing the prepared electrode, which only requires 1.49 V to achieve 10 mA cm −2 and is durable for over 360 h at industrial‐grade current densities in alkaline high‐salt, real seawater, rainwater, and urea electrolytes. Abstract : Metal–organic framework‐based self‐supporting bifunctional electrodes interspersed with cellular cobalt–boron catalysts on flexible carbon cloth substrate are developed via mild electroless plating toward overall water splitting for large‐scale green hydrogen production in alkaline simulated seawater. They possess high catalytic performance and outstanding durability, which can electrolyze continuously for over 2500 h at 500 mA cm −2 .