Wang Shuai, Zhao Rui, Zheng Tian, Fang Yuan, Wang Wenjian, Xue Weidong
School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China.
School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China.
J Colloid Interface Sci. 2022 Jul 15;618:34-43. doi: 10.1016/j.jcis.2022.03.067. Epub 2022 Mar 17.
Metal boride has been verified as the highly efficient catalyst for oxygen evolution reaction. However, the design and synthesis of self-supporting metal borides remain a big challenge. Herein, metal-organic framework-derived metal boride electrode is in-situ formed on 3D framework via controllable boronation strategy, which is of great significance to the construction of self-supporting metal borides. This strategy not only produces the metal boride materials but also achieves the metal borides based self-supporting electrode with multiple structures. The as-fabricated CoFe-PBA-B exhibits a low overpotential of 255 mV at the current density of 10 mA cm and a low Tafel slope of 51 mV dec due to the enhanced active sites of multiple structures and effective electronic interaction between metal atoms and boron atom. In addition, CoFe-PBA-B shows good stability with negligible weaken in current density for 40 h. This work provides new boulevard for the design and synthesis of self-supporting metal borides for electrochemical OER.
金属硼化物已被证实是用于析氧反应的高效催化剂。然而，自支撑金属硼化物的设计与合成仍然是一个巨大的挑战。在此，通过可控硼化策略在三维框架上原位形成金属有机框架衍生的金属硼化物电极，这对自支撑金属硼化物的构建具有重要意义。该策略不仅能制备金属硼化物材料，还能实现具有多种结构的基于金属硼化物的自支撑电极。所制备的CoFe-PBA-B在电流密度为10 mA cm时具有255 mV的低过电位和51 mV dec的低塔菲尔斜率，这归因于多种结构增强的活性位点以及金属原子与硼原子之间有效的电子相互作用。此外，CoFe-PBA-B表现出良好的稳定性，在40小时内电流密度几乎没有减弱。这项工作为用于电化学析氧反应的自支撑金属硼化物的设计与合成提供了新途径。
