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Investigation on micromorphology and electrochemical kinetics of La–Mg–Ni-based alloy chemically modified by nanopolypyrrole

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Abstract

In order to improve the electrochemical kinetics of La–Mg–Ni-based alloy, the chemical modification of polypyrrole (PPy) doped with sodium sulfate (Na2SO4) has been applied on the surface of the La0.80 Mg0.20Ni2.70Mn0.10Co0.55Al0.10 alloy particles. SEM, TEM, and FT-IR results indicate that the spongy nano-PPy successfully forms on the surface of the alloy particles and that the PPy nanoparticles distribute uniformly. Owing to the nano-PPy, which possesses excellent electrochemical redox reversibility, electrocatalytic activity, and high conductivity, electrochemical kinetics of the alloy electrode is remarkably ameliorated. The high-rate dischargeability (HRD) of the treated alloy electrode at 1800 mA g−1 reaches two times of that for the bare alloy, meanwhile the discharge voltages increase obviously. The charge transfer resistance (R ct) of treated alloy electrode markedly decreases; the limiting current density (I L) and the hydrogen diffusion coefficient (D) increase.

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Acknowledgments

This work (research) was financially supported by the National Natural Science Foundation of China (Nos. 51171165 and 21303157), the Natural Science Foundation of Hebei Province (Nos. B2012203027, B2012203104, and B2014203114), the China Postdoctoral Science Foundation Project (2013 M541201) and the Research Fund for the Doctoral Program of Higher Education of China (20131333120008).

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Author notes

  1. Wenzhuo Shen

    Present address: School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China

Authors and Affiliations

  1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, People’s Republic of China

    Shumin Han

  2. Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, 066004, People’s Republic of China

    Yunchai Wang, Yuan Li, Wenzhuo Shen, Yaru Pei, Jingjing Liu, Shuqin Yang & Shumin Han

  3. Desert Vista High School, Phoenix, AZ, 85048, USA

    Jerry Yinghui Che

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  1. Yunchai Wang
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Correspondence to Shumin Han.

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Wang, Y., Li, Y., Shen, W. et al. Investigation on micromorphology and electrochemical kinetics of La–Mg–Ni-based alloy chemically modified by nanopolypyrrole. J Solid State Electrochem 19, 1419–1425 (2015). https://doi.org/10.1007/s10008-015-2755-5

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  • DOI: https://doi.org/10.1007/s10008-015-2755-5

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