【摘要】 用化学腐蚀方法制备出3D多孔自支撑型Mn₅₀Fe_12.5Co_12.5Ni_12.5Cr_12.5高熵合金。电化学测试结果表明，将这种高熵合金放入1 mol/L KOH的碱性溶液中，电流密度为10 mA·cm^-2时过电位为281 mV,Tafel斜率为63 mV/dec,表明其电催化性能优于商业RuO₂的性能。在电流密度为50 mA·cm^-2的条件下连续工作50 h，工作电压没有明显的升高，表明这种富锰高熵电催化电极材料具有优异的析氧稳定性。电化学阻抗谱表明，这种自支撑型结构的块体高熵合金催化剂具有出色的导电性，与负载型催化剂相比其电子转移能力显著提高。更多还原

【Abstract】 A novel three-dimensional porous self-supporting electrode material for electrochemical catalytic oxygen evolution were prepared by chemical etching method from a bulk high-entropy alloy Mn₅₀Fe_12.5Co_12.5Ni_12.5Cr_12.5.The electrochemical test results show that the overpotential of the prepared electrode material is only 281 mV at the current of 10 mA·cm^-2 and the Tafel slope is 63 mV/dec in an alkaline solution of 1 mol/L KOH,which is better than that of commercial RuO₂.At the same time,the working voltage does not increase significantly after continuous operation for 50 h at the current density of 50 mA·cm^-2,which reflects the excellent stability during electrocatalytic oxygen evolution process of the Mn-rich high-entropy porous alloy as electrocatalytic electrode material.The Nyquist plots show that the free-standing structure of the bulk HEA catalyst has outstanding electron transfer ability compared with the ordinary supported catalyst.更多还原