Abstract New nanocomposites, containing nickel oxide nanoparticles (NiONPs) and Nile blue@reduced graphene oxide (NB/rGO), were synthesized. Nile blue was decorated on the surface of rGO by covalent bonds (using diazonium reaction). Then, NiONPs was immobilized on the surface of the functionalized rGO. The electrocatalytic and electrochemical behaviors of NiO@rGO and NiO@Nile/rGO nanocomposites for HER were investigated using cyclic voltammetry and electrochemical impedance spectroscopy in acidic and alkaline media. From them, NiO@rGO has shown long-term stability for HER in acidic solution at room temperature. The electrocatalytic activity of NiO@rGO (vs. NiO@Nile/rGO) for HER was greatly improved and its behavior was close to the behavior of platinum. In the next stage of our study, due to the importance of oxygen as an energy source, the production of oxygen molecules through electrochemical oxidation of water at NiO@rGO and NiO@Nile/rGO were studied too. For this purpose, the electrochemical behaviors of the nanocomposites for oxygen evolution reaction were investigated using cyclic voltammetry and electrochemical impedance spectroscopy in acidic and alkaline media. The results of them confirmed that NiO@Nile/rGO acts as an excellent electrocatalyst with good long-term stability for oxygen evolution reaction in 0.5 mol L−1 KOH solution at room temperature. Therefore, NiO@rGO and NiO@Nile/rGO can be used as powerful cathode and anode, respectively in an electrochemical cell for water splitting.

中文翻译：

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NiO 纳米粒子装饰在尼罗蓝修饰的还原氧化石墨烯，一种新型强大的水分解电催化剂

摘要 合成了含有氧化镍纳米粒子 (NiONPs) 和尼罗蓝@还原氧化石墨烯 (NB/rGO) 的新型纳米复合材料。尼罗蓝通过共价键（使用重氮反应）装饰在 rGO 的表面。然后，将 NiONPs 固定在功能化的 rGO 表面。使用循环伏安法和电化学阻抗谱研究了 NiO@rGO 和 NiO@Nile/rGO 纳米复合材料在酸性和碱性介质中的电催化和电化学行为。从它们中，NiO@rGO 在室温下在酸性溶液中显示出对 HER 的长期稳定性。NiO@rGO（vs. NiO@Nile/rGO）对HER的电催化活性大大提高，其行为接近铂的行为。在我们研究的下一阶段，由于氧气作为能源的重要性，还研究了在 NiO@rGO 和 NiO@Nile/rGO 上通过电化学氧化水产生氧分子。为此，使用循环伏安法和电化学阻抗谱在酸性和碱性介质中研究了纳米复合材料的析氧反应电化学行为。他们的结果证实，NiO@Nile/rGO 是一种优异的电催化剂，在室温下在 0.5 mol L-1 KOH 溶液中析氧反应具有良好的长期稳定性。因此，NiO@rGO 和 NiO@Nile/rGO 可分别用作用于水分解的电化学电池中的强大阴极和阳极。使用循环伏安法和电化学阻抗谱在酸性和碱性介质中研究了纳米复合材料的析氧反应的电化学行为。他们的结果证实，NiO@Nile/rGO 是一种优异的电催化剂，在室温下在 0.5 mol L-1 KOH 溶液中析氧反应具有良好的长期稳定性。因此，NiO@rGO 和 NiO@Nile/rGO 可分别用作用于水分解的电化学电池中的强大阴极和阳极。使用循环伏安法和电化学阻抗谱在酸性和碱性介质中研究了纳米复合材料的析氧反应的电化学行为。他们的结果证实，NiO@Nile/rGO 是一种优异的电催化剂，在室温下在 0.5 mol L-1 KOH 溶液中析氧反应具有良好的长期稳定性。因此，NiO@rGO 和 NiO@Nile/rGO 可分别用作用于水分解的电化学电池中的强大阴极和阳极。室温下 5 mol L-1 KOH 溶液。因此，NiO@rGO 和 NiO@Nile/rGO 可分别用作用于水分解的电化学电池中的强大阴极和阳极。室温下 5 mol L-1 KOH 溶液。因此，NiO@rGO 和 NiO@Nile/rGO 可分别用作用于水分解的电化学电池中的强大阴极和阳极。