Journal
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
Volume 27, Issue 3, Pages 391-400Publisher
SPRINGER
DOI: 10.1007/s12613-019-1880-z
Keywords
hydrogen storage alloys; surface modification; graphene oxide; electrochemical properties; kinetics
Categories
Funding
- National Natural Science Foundation of China [21303157, 51771164]
- Natural Science Foundation of Hebei Province [E2019203161]
- Scientific Research Projects in Colleges and Universities in Hebei Province [QN2016002]
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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 threedimensional 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 center dot 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.
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