Ni-Cr-Cu三元合金电极制备及其析氢性能研究

Preparation of Ni-Cr-Cu alloy membrane electrode and its hydrogen evolution performance

摘要:

本文以废旧紫铜片为基体，Ni粉、Cr粉为覆膜材料，通过活化反应烧结法制备了Ni-Cr-Cu三元合金电极材料。采用X射线衍射分析(XRD)、场发射电镜(SEM)、X射线能谱分析(EDS)等对电极的物相、形貌结构、元素分布、以及析氢产物进行表征；通过循环伏安、线性极化、交流阻抗等方法测试了合金电极材料的电催化析氢性能。结果表明Ni-Cr-Cu三元合金薄膜电极具有优异的析氢性能，调节Cr元素的含量可提高其析氢催化活性，在室温条件下，Ni30wt%Cr-Cu三元合金电极材料在6mol/L KOH的溶液中析氢性能较好，其析氢过电位仅有-0.13V (vs SCE)，交换电流密度为10mA/cm2时对应的极化电位为-0.145V (vs SCE)；经开路电位测试36000 s后，电极材料的开路电位（η）从0.05V变化为0.02V，仅降低0.03 V，表明析氢电极化学稳定性良好。

Abstract:

Ni-Cr-Cu ternary alloys electrode materials were prepared by activation reaction sintering method with tinplate, Ni powder and Cr powder as raw materials. The phase, constitute morphology and element component of the electrode were characterized by XRD, SEM, EDS. The electrocatalytic hydrogen evolution performance of alloy electrode materials was investigated by cyclic voltammetry curve, linear polarization curve, potentiodynamic polarization curve, electrochemical impedance spectrum. The results show that the Ni-Cr-Cu ternary alloy film electrode has excellent hydrogen evolution performance, and the content of Cr can improve the hydrogen evolution catalytic activity. At room temperature, Ni30wt%Cr-Cu ternary alloy electrode material is 6mol/L. The catalytic activity of hydrogen evolution in KOH solution is the strongest, the hydrogen evolution overpotential is only -0.13 V (vs SCE), the potential is -0.145 V (vs SCE) as the exchange current density of 10mA/cm2, and the open circuit potential (η) of the electrode material is from 0.05 to 0.02 V after 36000 s, which only increased by 0.03 V, indicating that the hydrogen evolution electrode has good chemical stability.