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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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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.

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Authors and Affiliations

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

    Shuqin Yang, Yunchai Wang, Yuan Li & Laizhou Song

Authors
  1. Shuqin Yang
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  2. Yunchai Wang
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  3. Yuan Li
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  4. Laizhou Song
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Corresponding authors

Correspondence to Shuqin Yang or Laizhou Song.

Additional information

Supported by the National Natural Science Foundation of China (Nos. 51571173, 51701175, 51771164).

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40242_2019_9169_MOESM1_ESM.pdf

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

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Yang, S., Wang, Y., Li, Y. et al. Improved Electrochemical Kinetic Performances of La-Mg-Ni-based Hydrogen Storage Alloy Modified by Ni-Polypyrrole Complex Surface Treatment. Chem. Res. Chin. Univ. 35, 1052–1057 (2019). https://doi.org/10.1007/s40242-019-9169-3

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  • DOI: https://doi.org/10.1007/s40242-019-9169-3

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