Nd–Mg–Ni alloy electrodes modified by reduced graphene oxide with improved electrochemical kinetics

Yuan Li; Li-na Cheng; Wen-kang Miao; Chun-xiao Wang; De-zhi Kuang; Shu-min Han

doi:10.1007/s12613-019-1880-z

Volume 27 Issue 3

Mar. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(3): 391-400

Yuan Li, Li-na Cheng, Wen-kang Miao, Chun-xiao Wang, De-zhi Kuang, and Shu-min Han, Nd–Mg–Ni alloy electrodes modified by reduced graphene oxide with improved electrochemical kinetics, Int. J. Miner. Metall. Mater., 27(2020), No. 3, pp. 391-400. https://doi.org/10.1007/s12613-019-1880-z

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Yuan Li, Li-na Cheng, Wen-kang Miao, Chun-xiao Wang, De-zhi Kuang, and Shu-min Han, Nd–Mg–Ni alloy electrodes modified by reduced graphene oxide with improved electrochemical kinetics, Int. J. Miner. Metall. Mater., 27(2020), No. 3, pp. 391-400. https://doi.org/10.1007/s12613-019-1880-z

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Research Article

Nd–Mg–Ni alloy electrodes modified by reduced graphene oxide with improved electrochemical kinetics

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Corresponding author:
Shu-min Han E-mail: hanshm@ysu.edu.cn
Received: 2 May 2019; Revised: 8 June 2019; Accepted: 25 June 2019; Available online: 17 December 2019

Abstract

Abstract

To improve the electrochemical kinetics of Nd–Mg–Ni alloy electrodes, the alloy surface was modified with highly conductive reduced graphene oxide (rGO) via a chemical reduction process. Results indicated that rGO sheets uniformly coated on the alloy surface, yielding a three-dimensional network layer. The coated surfaces contained numerous hydrophilic functional groups, leading to better wettability of the alloy in aqueous alkaline media. This, in turn, increased the concentration of electro-active species at the interface between the electrode and the electrolyte, improving the electrochemical kinetics and the rate discharge of the electrodes. The high rate dischargeability at 1500 mA·g^–1 increased from 53.2% to 83.9% after modification. In addition, the modification layer remained stable and introduced a dense metal oxide layer to the alloy surface after a long cycling process. Therefore, the protective layer prevented the discharge capacity from quickly decreasing and improved cycling stability.
- hydrogen storage alloys;
- surface modification;
- graphene oxide;
- electrochemical properties;
- kinetics

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