Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 23    No. 2    February 2013

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Structure and electrochemical performance of Cu singly doped and Cu/Al co-doped nano-nickel hydroxide
Jie BAO, Yan-juan ZHU, Yi-huan ZHUANG, Qing-sheng XU, Ru-dong ZHAO, Yong-lin LIU, Hao-liang ZHONG

School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China

Abstract:Nanometer Cu singly doped and Cu/Al co-doped nickel hydroxides were synthesized by ultrasonic-assisted precipitation method. Their crystal structure, particle size, morphology, tap density and electrochemical performance were investigated. The results show that the samples have α-phase structure with narrow particle size distribution. Cu singly doped nano-Ni(OH)2 contains irregular particles, while Cu/Al co-doped nano-Ni(OH)2 displays a quasi-spherical shape and has a relatively higher tap density. Composite electrodes were prepared by mixing 8% (mass fraction) nanometer samples with commercial micro-size spherical nickel. The charge/discharge test and cyclic voltammetry results indicate that the electrochemical performance of Cu/Al co-doped nano-Ni(OH)2 is better than that of Cu singly doped nano-Ni(OH)2, the former’s discharge capacity reaches 330 mA·h/g at 0.2C, 12 mA·h/g and 91 mA·h/g larger than that of Cu singly doped sample and pure spherical nickel electrode, respectively. Moreover, the proton diffusion coefficient of Cu/Al co-doped sample is 52.3% larger than that of Cu singly doped sample.

 

Key words: nano-Ni(OH)2; ultrasonic-assisted precipitation; doping; electrochemical performance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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