FeCoNiMgB high-entropy boride powder with a fluffy cotton structure and enhanced activity in the oxygen evolution reaction

• DOI: 10.1016/j.jmrt.2024.03.158
• Publication Date: 2024-03-25T17:39:35Z
• Authors: Fang Miao; Peng Cui; Zhiyuan Jing; Wei Wu; Zhibin Zhang; Tao Gu; Zhijie Yan; Xiubing Liang
• Keywords: Overpotential; Oxygen evolution

Exploring efficient, low-cost electrocatalysts is critical for improving the efficiency of water splitting reactions. Noble-metal-based oxides exhibit high activities in oxygen evolution reaction (OER). However, their cost and lack natural resources hinder practical application. Therefore, this study, we successfully synthesized an FeCoNiMgB high-entropy boride powder via a facile chemical reduction method use as OER catalyst alkaline medium. The powder, with ultrathin fluffy cotton structure, exhibited excellent catalytic performance, affording overpotential 268 mV at current density 10 mA/cm2 low Tafel slope 42.9 mV/dec; performance was superior to those FeCoNiB, FeNiMgB, CoNiMgB, FeCoMgB, commercial RuO2. also displayed remarkably stable properties >72 h no clear evidence degradation. Finally, using theoretical calculations, verified terms its adsorption charge transfer energies covalence. stability were equivalent or several nanostructured catalysts, thus, study provided valuable insight into design efficient materials.