Jiang Min, Li Jun, Li Junming, Zhao Yu, Pan Lijia, Cao Qingqi, Wang Dunhui, Du Youwei
National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University, Nanjing 210093, China.
Nanoscale. 2019 May 16;11(19):9654-9660. doi: 10.1039/c8nr10521a.
Highly efficient non-noble metal oxygen evolution reaction (OER) catalysts are urgently needed for the practical application of electrochemical energy technology. Herein, we report two-dimensional (2D) bimetallic phosphide (Co1-xFexP) ultrathin nanosheets as new OER catalysts. The two-dimensional (2D) morphology of the nanosheets and the synergistic effect between different transition-metal elements made contributions to the OER catalysis. By optimizing the doping ratio of the Fe atoms, the Co0.8Fe0.2P nanosheets showed the best OER performance with a small overpotential of 270 mV versus a rotating hydrogen electrode at a current density of 10 mA cm-2 and low Tafel slope of 50 mV dec-1 in an alkaline electrolyte. Moderate iron doping improved the degree of oxidation at the surface of CoP nanosheets and preserved the conductive and chemically stabilizing host, thereby enhancing the OER activity. Our findings could aid the rational design of novel non-layered 2D nanomaterial OER catalysts.
电化学能源技术的实际应用迫切需要高效的非贵金属析氧反应（OER）催化剂。在此，我们报道了二维（2D）双金属磷化物（Co1-xFexP）超薄纳米片作为新型OER催化剂。纳米片的二维（2D）形态以及不同过渡金属元素之间的协同效应有助于OER催化。通过优化Fe原子的掺杂比例，Co0.8Fe0.2P纳米片在碱性电解液中，在电流密度为10 mA cm-2时相对于旋转氢电极具有270 mV的小过电位和50 mV dec-1的低塔菲尔斜率，表现出最佳的OER性能。适度的铁掺杂提高了CoP纳米片表面的氧化程度，并保留了导电且化学稳定的主体，从而增强了OER活性。我们的研究结果有助于合理设计新型非层状二维纳米材料OER催化剂。
