双金属磷化物和杂原子共修饰碳材料的制备及电催化性能

Preparation and Electrocatalytic Performance of Carbon Material Co-doped by Bimetal Phosphide and Heteroatom

以高含氮量的苯胺五聚体二羧酸为配体,在预氧化的泡沫镍上通过溶剂热反应合成了Fe,Co金属有机框架材料Fe/Co-MOF,再以Fe/Co-MOF为金属源和碳源,经磷化后制备出一种新型的双金属(Fe,Co)和杂原子(N,P)共掺杂的碳材料Fe/Co/P-NPs.通过扫描电子显微镜和高分辨透射电子显微镜表征发现,Fe/Co/P-NPs由纳米粒子和纳米片组成,并且形成Fe2P和Co2P两种晶体.电化学测试结果表明,Fe/Co/P-NPs在析氢、析氧及水电解中表现出了优异的多功能催化活性.在1 mol/L KOH中,Fe/Co/P-NPs在10和100 mA/cm^2电流密度时的析氧过电位分别为270和300 mV,均小于其它对比材料,优于负载在泡沫镍上的RuO2.作为水电解双功能催化剂,Fe/Co/P-NPs仅需1.48 V的电位即可获得10 mA/cm^2的电流密度.

A kind of aniline pentamer with high nitrogen content was used as ligand to prepare Fe/Co-MOF loading on nickel foam through solvothermal method.Fe 2P,Co2P,N and P modified carbon material(Fe/Co/P-NPs)was obtained by phosphating reaction with Fe/Co-MOF as metal and carbon sources.Scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS)and X-ray diffraction analysis(XRD)were employed to characterize the morphology and structure of the materials.The electrocatalytic activity and stability of the materials were characterized by cyclic voltammetry(CV)and linear sweep voltammetry(LSV).It is found that Fe/Co/P-NPs display good catalytic activity in oxygen evolution reaction,with over potentials of 270 and 300 mV to deliver 10 mA/cm^2 and 100 mA/cm^2 current density,respectively,proving the better activity than that of RuO2.Importantly,it requires 1.48 V to reach the current density of 10 mA/cm^2 and shows good stability in alkaline solution.