| 超声波处理对球形β-Ni(OH)2结构及电化学性能的影响 |
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| 引用本文： | 周环波,周震涛.超声波处理对球形β-Ni(OH)2结构及电化学性能的影响[J].中国化学,2006,24(1):37-44. |
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| 作者姓名： | 周环波 周震涛 |
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| 作者单位： | [1]College of Material Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China [2]Department of Chemistry, Xiaogan University, Xiaogan, Hubei 432100, China |
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| 基金项目： | Received January 12, 2005; revised June 15, 2005; accepted September121,2005. |
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| 摘 要： | A method of ultrasonic treatment （UST） was first used to modify the structure and electrochemical performance of nickel hydroxide for the active material of nickel series alkaline batteries. The experimental results showed that UST was an effective method to improve the electrochemical performance of β-Ni（OH）2 such as specific discharge capacity, discharge potential, electrochemical reversibility and oxygen evolution over-potential. The results of electrochemical impedance spectroscopy, powder X-ray diffraction and particle size distribution indicated that the improvement of the performance of β-Ni（OH）2 through UST was attributed to the reduction of the charge-transfer resistance （Rt） and the diffusion impedance （Zw）, which resulted from the decrease of the crystallite and particle size and the increase of interlayer spacing. Diffusion coefficient of proton DH of ultrasonic treated β-Ni（OH）2 gained by CV tests was 1.13 × 10^-11 cm^2/s, and the average discharge specific capacity of ultrasonic treated β-Ni（OH）2 electrode was 301 mAh/g.
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| 关 键 词： | 镍 超音波处理 化学结构 电化学 催化反应 |
| 收稿时间： | 2005-01-12 |
| 修稿时间： | 2005-01-122005-06-15 |
Effects of Ultrasonic Treatment on the Structure and Electrochemical Performances of Spherical β‐Ni(OH)2 |
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| Zhou HuanBo;Zhou ZheTao.Effects of Ultrasonic Treatment on the Structure and Electrochemical Performances of Spherical β‐Ni(OH)2[J].Chinese Journal of Chemistry,2006,24(1):37-44. |
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| Authors: | Zhou HuanBo;Zhou ZheTao |
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| Abstract: | A method of ultrasonic treatment (UST) was first used to modify the structure and electrochemical performance of nickel hydroxide for the active material of nickel series alkaline batteries. The experimental results showed that UST was an effective method to improve the electrochemical performance of β‐Ni(OH)2such as specific discharge capacity, discharge potential, electrochemical reversibility and oxygen evolution over‐potential. The results of electrochemical impedance spectroscopy, powder X‐ray diffraction and particle size distribution indicated that the improvement of the performance of β‐Ni(OH)2 through UST was attributed to the reduction of the charge‐transfer resistance (Rt) and the diffusion impedance (Zw), which resulted from the decrease of the crystallite and particle size and the increase of interlayer spacing. Diffusion coefficient of proton DH of ultrasonic treated β‐Ni(OH)2gained by CV tests was 1.13×10?11cm2/s, and the average discharge specific capacity of ultrasonic treated β‐Ni(OH)2 electrode was 301 mAh/g. |
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| Keywords: | nickel hydroxide ultrasonic treatment electrochemical performance crystallite and particle size |
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