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 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·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.

中文翻译：

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还原氧化石墨烯修饰的Nd-Mg-Ni合金电极具有改善的电化学动力学

摘要

为了改善Nd-Mg-Ni合金电极的电化学动力学，通过化学还原工艺用高导电性还原氧化石墨烯（rGO）修饰了合金表面。结果表明，rGO薄板均匀地涂覆在合金表面上，产生三维网络层。涂层表面含有许多亲水性官能团，从而使合金在碱性水溶液中的润湿性更好。反过来，这增加了电极和电解质之间的界面处的电活性物质的浓度，改善了电化学动力学和电极的速率放电。1500 mA·g ^-1时的高倍率放电能力修改后从53.2％增加到83.9％。另外，在长时间的循环过程之后，改性层保持稳定并在合金表面引入致密的金属氧化物层。因此，保护​​层防止了放电容量的迅速降低和循环稳定性的提高。