Improved Electrochemical Kinetic Performances of La-Mg-Ni-based Hydrogen Storage Alloy Modified by Ni-Polypyrrole Complex Surface Treatment

doi:10.1007/s40242-019-9169-3

Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (6): 1052-1057.doi: 10.1007/s40242-019-9169-3

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Improved Electrochemical Kinetic Performances of La-Mg-Ni-based Hydrogen Storage Alloy Modified by Ni-Polypyrrole Complex Surface Treatment

YANG Shuqin, WANG Yunchai, LI Yuan, SONG Laizhou

Department of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, P. R. China

Received:2019-06-19 Revised:2019-10-08 Online:2019-12-01 Published:2019-11-29
Contact: YANG Shuqin, SONG Laizhou E-mail:shuqinyang@ysu.edu.cn;songlz@ysu.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.51571173, 51701175, 51771164).

Abstract

Abstract: In order to improve the electrochemical kinetic performances of La-Mg-Ni-based alloy, complex surface modification of Ni with excellent catalytic activity and conducting polymer polypyrrole(PPy) was performed via electroless plating method. FESEM images revealed that the complex Ni-PPy treatment resulted in more micropores at the alloy surface, with Ni particles and cotton fiber-shape PPy microspheres attached. Both the larger surface area induced by the micropore and the higher catalytic activity and conductivity on account of the dispersed Ni particles/PPy microspheres promoted the electrode reaction, thereby increasing the discharge capacity of the modified alloy electrode. Electrochemical impedance spectroscopy(EIS) and linear polarization results showed that the Ni-PPy treatment decreased the charge-transfer resistance and increased the exchange current density greatly, far more than the single-component Ni or PPy treatment. Consequently, a notable improvement in high rate dischargeability(HRD) was observed, and at a high discharge current density of 1800 mA/g, the HRD of the modified electrode increased by 10.4% compared with that of the bare electrode.

Key words: Ni/MH battery, La-Mg-Ni-based alloy, Complex surface treatment, Ni-PPy, Electrochemical kinetic characteristic

YANG Shuqin, WANG Yunchai, LI Yuan, SONG Laizhou. Improved Electrochemical Kinetic Performances of La-Mg-Ni-based Hydrogen Storage Alloy Modified by Ni-Polypyrrole Complex Surface Treatment[J]. Chemical Research in Chinese Universities, 2019, 35(6): 1052-1057.

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Improved Electrochemical Kinetic Performances of La-Mg-Ni-based Hydrogen Storage Alloy Modified by Ni-Polypyrrole Complex Surface Treatment

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