摘要
采用电化学共沉积法在泡沫镍基体上制备了掺杂Co(OH)2的纳米级Ni(OH)2电极。采用XRD、SEM、EDS等分析表征了电极材料的晶体结构、成分和形貌;采用恒流充放电、循环伏安及交流阻抗等方法测试了其电化学性能。结果表明,电化学共沉积法可以制备定量掺杂Co(OH)2的α-Ni(OH)2,该电极材料具有三维纳米花状结构;适当掺杂Co(OH)2的α-Ni(OH)2可以显著提高电极的比容量和循环性能,还提高了放电电位和氧气析出过电位,同时提高了其质子扩散系数和降低了扩散阻抗。
Nanostructural nickel hydroxide electrode doped with cobalt hydroxide was prepared by directly depositing nickel hydroxide on the surface of foam nickel using electrochemical deposition technology.The characterization of the nickel hydroxide electrode was studied by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,energy-dispersive spectrometry（EDS）,and constant-current charge-discharge,cyclic voltammetry（CV） and AC impedance（IMP）.The results show that α-type nickel hydroxide doped with quantitative cobalt hydroxide can be prepared by electrochemical co-deposition method,the samples are composed of many uniform 3D flowerlike nanostructures formed by dozens of flakelike nanopetals or nanowires,moderate cobalt hydroxide additive can significantly improve specific capacitance and cycle performance of α-type nickel hydroxide electrode.The study also found that nickel hydroxide electrode with cobalt hydroxide has higher discharge potential and the overpotential of oxygen precipitation,and also has higher proton diffusion coefficient and lower diffusion impedance.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2011年第5期11-16,共6页
Transactions of Materials and Heat Treatment
基金
北京市教委资助项目
关键词
氢氧化镍
超级电容器
掺杂
质子扩散系数
nickel hydroxide
super capacitor
doping
proton diffusion coefficient
