Abstract Nickel selenide nanoparticles uniformly supported on graphene nanosheets to form NiSe2/rGO composites were prepared via one-step mixing solvothermal method. The NiSe2/rGO composite possesses a high specific capacity of 137.7 mA h g−1 (1A g−1) and displays an excellent rate property. Moreover, there are NiSe2/rGO-20 as electrode materials assembling asymmetric supercapacitors, which manifests high energy density (33.13 Wh kg−1) at a power density (850 W kg−1) and the capacity can maintain of 80 % after 10,000 cycles. Therefore, NiSe2/rGO composite can be a potential candidate for high-efficiency asymmetric supercapacitors.

中文翻译：

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在石墨烯表面混合溶剂热合成硒化镍用于高效不对称超级电容器

摘要 采用一步混合溶剂热法制备了均匀负载在石墨烯纳米片上的硒化镍纳米粒子以形成 NiSe2/rGO 复合材料。NiSe2/rGO 复合材料具有 137.7 mA hg-1 (1A g-1) 的高比容量并显示出优异的倍率特性。此外，还有NiSe2/rGO-20作为电极材料组装不对称超级电容器，在功率密度（850 W kg-1）下表现出高能量密度（33.13 Wh kg-1），并且在10,000次循环后容量可以保持80％ . 因此，NiSe2/rGO 复合材料可以成为高效不对称超级电容器的潜在候选者。