CoP3和CoSP3自支撑纳米线阵列的电催化析氢性能

Self-standing CoP3 and CoSP3 nanowire arrays for efficient electrocatalytic hydrogen evolution reaction

为开发廉价高效的电解水析氢催化材料,采用水热和气氛热处理法在碳纤维纸(carbon fiber paper,CFP)表面制备出了均匀生长的CoP3和CoSP 3纳米线阵列(CoP3 NWs/CFP和CoSP3 NWs/CFP)。应用X射线衍射(X-ray diffraction,XRD)和扫描电子显微镜(scanning electron microscope,SEM)分析其物相和微观形貌,并测试其在酸性溶液中的析氢催化性能,从电化学阻抗谱(electrochemical impedance spectroscopy,EIS)和电化学活性面积(electrochemically active surface area,ECSA)两方面分析了CoSP3NWs/CFP具有优异催化性能的原因。结果表明,CoSP 3具有比CoP3更高的本征催化活性,CoSP3 NWs/CFP仅需要89 mV和129 mV的过电位即能驱动10 mA/cm 2和100 mA/cm^2的析氢电流密度,其Tafel斜率值为40.3 mV/dec,并展现出良好的析氢稳定性。

The development of low-cost and efficient electrocatalysts for hydrogen evolution reaction is of great significance.In this paper,CoP3 and CoSP3 nanowire arrays were successfully grown on carbon fiber paper(CFP)via hydrothermal and atmospheric heat treatment method.X-ray diffraction(XRD)and scanning electron microscope(SEM)were used to analyze the phases and morphology of the as-obtained samples,respectively.The catalytic performance for hydrogen evolution reaction in acidic solution was tested.And the excellent performance of CoSP3 NWs/CFP was supported by the electrochemical impedance spectroscopy(EIS)and electrochemically active surface area(ECSA)reults.It suggests that CoSP3 has higher intrinsic catalytic activity than CoP3.For CoSP3 NWs/CFP,to drive current densities of 10 mA/cm^2 and 100 mA/cm^2,overpotential of 89 mV and 129 mV will be only needed,respevtively,with a low Tafel slope of 40.3 mV/dec.Besides,CoSP3 NWs/CFP also exhibited good stability at the same time.