Zhang Jingguo, Zhou Youzhi, Zhang Shaoming, Li Shuo, Hu Qiang, Wang Ligen, Wang Limin, Ma Fei
Beijing General Research Institute For Nonferrous Metals, Beijing, 100088, China.
GRIPM Advanced Materials Co.,Ltd, Beijing, 101407, China.
Sci Rep. 2018 Oct 10;8(1):15071. doi: 10.1038/s41598-018-33205-4.
Composite porous foam NiZn alloy electrodes with nano pore structure were prepared by the combination of eletrodeposition, heat treatment and HCl etching. The morphology of the electrodes was examined by scanning electron microscopy (SEM). And the component of the electrodes was analyzed by Energy Dispersive Spectrum (EDS). The specific surface area and pore size of the electrode were investigated by nitrogen adsorption. The phase constituents were analyzed by X ray diffraction (XRD), and the electrocatalytic characteristics for hydrogen evolution reaction of the electrodes in 30% (mass fraction) KOH solution were investigated by cathode polarization curve. The experimental results showed that the pores were formed on surface of the foam NiZn alloy electrodes after heat treatment at 600 °C, and with the etching by 10% HCl, nano layered structure was formed on the surface of the porous skeleton. Compared with the nickel foam, the surface area of the NiZn foam alloy electrode became larger, and the nano pore structure had good catalytic activity. At current density of 200 mA·dm, the hydrogen evolution overpotential of the NiZn foam alloy electrodes were reduced by 222 mV and 276 mV, respectively, through heat treatment of 600 °C and etching in 10% HCl solution, which indicated that the hydrogen evolution overpotential was effectively reduced because of the composite nano porous structure, while the activity of hydrogen evolution of the electrodes was obviously improved.
通过电沉积、热处理和盐酸蚀刻相结合的方法制备了具有纳米孔结构的复合多孔泡沫镍锌合金电极。采用扫描电子显微镜（SEM）对电极的形貌进行了观察。并通过能谱（EDS）分析了电极的成分。通过氮气吸附研究了电极的比表面积和孔径。采用X射线衍射（XRD）分析了相组成，并通过阴极极化曲线研究了电极在30%（质量分数）KOH溶液中析氢反应的电催化特性。实验结果表明，泡沫镍锌合金电极在600℃热处理后表面形成了孔隙，经10%HCl蚀刻后，在多孔骨架表面形成了纳米层状结构。与泡沫镍相比，镍锌泡沫合金电极的表面积增大，纳米孔结构具有良好的催化活性。在电流密度为200 mA·dm时，经600℃热处理和10%HCl溶液蚀刻后，镍锌泡沫合金电极的析氢过电位分别降低了222 mV和276 mV，这表明复合纳米多孔结构有效地降低了析氢过电位，同时电极的析氢活性明显提高。
