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Citation: REN Jun-Xia, ZHOU Zhen, YAN Jie. Effects of Yttrium-Doping on High-temperature Electrochemical Performances of Nickel Hydroxide Electrodes[J]. Acta Physico-Chimica Sinica, ;2007, 23(05): 738-742. doi: 10.3866/PKU.WHXB20070522 shu

Effects of Yttrium-Doping on High-temperature Electrochemical Performances of Nickel Hydroxide Electrodes

1.
Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, P. R. China

Received Date: 14 November 2006
Available Online: 21 April 2007

Y-doped β-Ni(OH)2 and α-Ni(OH)2 materials were synthesized, and the influences of Y on the structure, morphology and high-temperature electrochemical characteristics of the two kinds of materials were studied through XRD, TEM, CV, and charging/discharging tests. The results indicated that yttrium improved high-temperature electrochemical performances of β-Ni(OH)2 and α-Ni(OH)2 materials by the same mechanism that the charge efficiency was enhanced through the increase of oxygen evolution overpotentials. However, further efforts are still necessary to improve the phase stability of α-Ni(OH)2 at high temperatures.
- Nickel-metal hydride battery; Nickel hydroxide electrode; High-temperature performance; Charge efficiency; Rare earth element
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