Electrochemical properties of Mg3MnNi2-x% polymethyl methacrylate-multiwalled carbon nanotubes (PMMA-MWCNTs) (x = 25, 50, 75, 100)
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In this work, we report a novel core–shell-like structure of uniform coating PMMA-MWCNTs composite film on the surface of the Mg3MnNi2 alloy particles prepared by hydriding combustion synthesis. The structures and electrochemical performances of Mg3MnNi2 alloy with different PMMA-MWCNTs coating content have been studied in detail. Results show that the PMMA-MWCNTs composite film has no effect on the phase composition of Mg3MnNi2 alloy and the composite film has been successfully coated on the surface of Mg3MnNi2 alloy with a thickness of about 30 nm. In addition, MWCNTs are dispersed in the PMMA layer successfully, improving the electrochemical catalytic activity and working as a conductive path and a hydrogen diffusion channel as well. It is found that the coating of proper amount of PMMA-MWCNTs film can enhance obviously the cycling stability of the alloy electrode. The Mg3MnNi2-75% PMMA-MWCNTs sample exhibits the best overall electrochemical properties, with the best cycling stability, the optimal high-rate dischargeability, the maximum exchange current density and the minimum charge-transfer resistance (Rct).
This work was supported by the National Natural Science Foundation of China (51471087, 51571112), Natural Science Foundation of the Jiangsu Higher Education Institutions of China (13KJA430003, BK20151405, BK20161004) and the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions.
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Conflict of interest
The authors declare that they have no conflict of interest.
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