层状MnO_(2)/Co-C复合材料的常温制备及其电催化析氧性能研究

Preparation of Layered MnO_(2)/Co-C Composite at Room Temperature and Its Electrocatalytic Oxygen Evolution Performance

采用ZIF-67衍生多孔碳框架(Co-C)为碳载体,在常温下自发还原高锰酸钾制备了层状MnO_(2)/Co-C复合材料,并研究了MnO_(2)/Co-C的电催化析氧反应(OER)性能。结果表明,Co-C碳框架内部的Co_(3)O_(4)纳米颗粒对于MnO_(2)纳米片的常温生长具有催化促进作用;在碱性电解质(1 mol·L^(-1)KOH溶液)中,MnO_(2)/Co-C表现出较好的电催化OER性能,在10 mA·cm^(-2)电流密度下的过电位为427 mV,Tafel斜率为163 mV·dec^(-1),具有良好的电化学稳定性。

Taking ZIF-67-derived porous carbon framework(Co-C)as a carbon carrier,we prepared a layered MnO_(2)/Co-C composite by spontaneous reduction of potassium manganese at room temperature.Moreover,we studied the electrocatalytic oxygen evolution reaction(OER)performance of MnO_(2)/Co-C.The results show that the Co_(3)O_(4)nanoparticles in the Co-C carbon framework can promote the growth of MnO_(2)nanosheets at room temperature.In alkaline electrolyte(1 mol·L^(-1)KOH solution),MnO_(2)/Co-C shows good electrocatalytic OER performance with the overpotential of 427 mV and the Tafel slope of 163 mV·dec^(-1)at the current density of 10 mA·cm^(-2).In addition,MnO_(2)/Co-C has good electrochemical stability.