摘要
采用复合电沉积法制备了AC(活性炭)/Ni-Co复合电极。XRD和SEM测试结果表明,AC微粒的复合未改变Ni-Co合金电极的物相结构,但使镀层的表面粗糙度和真实表面积增大。通过稳态阴极极化曲线和电化学交流阻抗技术考察了不同电极在1 mol.L-1NaOH溶液中的催化析氢性能,结果表明,镀液中AC含量为3 g.L-1时所制备的AC/Ni-Co复合电极较Ni电极和Ni-Co合金电极具有更高的催化析氢活性,电流密度为30 mA.cm-2时,析氢反应极化电位分别比Ni电极和Ni-Co合金电极正移230 mV和140 mV,表观交换电流密度分别是Ni电极和Ni-Co合金电极的42倍和9倍,复合电极催化析氢性能的提高主要归因于电极真实表面积的增大。
The AC/Ni-Co composite electrode was prepared by means of composite-electrodeposition. The surface morphology and microstructure of the electrode coating were observed by XRD and SEM. The results show that the composition of AC does not change the crystal structure of the Ni-Co alloy electrode, but the surface roughness and real surface area of the coatings increase. Catalytic abilities for hydrogen evolution of different electrodes in 1 mol·L^-1 NaOH solution were evaluated on the basis of electrochemical steady-state polarization curves and alternating current impedance spectrum technology. The results show that the AC/Ni-Co composite electrode （the amount of AC is 3 g·L^-1 in bath ） is catalytically more active than the Ni and Ni-Co alloy electrode. The polarization potential for hydrogen evolution of the composite electrode is 230 mV lower than that of the Ni electrode and is 140 mV lower than that of the Ni-Co alloy electrode at the current density of 0.03 A·cm^-2. The apparent exchange current density of the composite electrode is 30 times as much as that of Ni electrode, and 6 times that of the Ni-Co alloy electrode. The increasing catalytic activity for hydrogen evolution of the AC/Ni-Co composite electrode is mainly due to the increase in the real surface area of the electrode.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2006年第3期77-81,共5页
Acta Materiae Compositae Sinica
基金
国家自然科学基金资助项目(50271046)
国家教育部博士点基金项目(20030056034)
关键词
AC/Ni—Co
复合材料
电催化
析氢反应
AC/Ni-Co
composite materials
electrocatalytic
hydrogen evolution reaction
