Abstract Nickel selenide and its nanocomposites (Nickel selenide-graphene; NiSe2/G, nitrogen and boron doped graphene designated as NiSe2/NG & NiSe2/BG respectively) were prepared using hydrothermal route and these materials were further exploited for its activity towards energy storage. The prepared materials were investigated with various analytical and morphological analysis like X-ray diffractometer and FESEM analysis. Further the prepared materials were probed for its electrochemical characteristics with various tools like voltammetric and controlled potentiostatic test to calculate the capacitance, energy and power density of the fabricated electrode. The electrochemical behavior of nickel selenide graphene nanocomposites were tested in KOH electrolyte. It was found that NiSe2/NG showed a high specific capacitance of 99.03 Fg−1 with 0.55 W kg−1 and 51.43 Wh kg−1 power and energy density respectively. A detailed study has been carried out to know the role of graphene and doped graphene towards capacitance. Hence, results proved that doping of graphene showed a synergistic effect thus proving a good electrode for storage applications.

中文翻译：

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石墨烯在 NiSe2/石墨烯复合材料中的作用 - 电化学超级电容器的合成和测试

摘要 利用水热法制备了硒化镍及其纳米复合材料（硒化镍-石墨烯；NiSe2/G，氮和硼掺杂的石墨烯分别命名为 NiSe2/NG 和 NiSe2/BG），并进一步利用这些材料的储能活性。用各种分析和形态分析如 X 射线衍射仪和 FESEM 分析对制备的材料进行了研究。此外，使用伏安法和受控恒电位试验等各种工具探测制备的材料的电化学特性，以计算所制备电极的电容、能量和功率密度。在 KOH 电解液中测试了硒化镍石墨烯纳米复合材料的电化学行为。发现 NiSe2/NG 显示出 99.03 Fg-1 的高比电容，0. 分别为 55 W kg-1 和 51.43 Wh kg-1 功率和能量密度。已经进行了详细的研究以了解石墨烯和掺杂石墨烯对电容的作用。因此，结果证明石墨烯的掺杂显示出协同效应，从而证明是用于存储应用的良好电极。