In present study, we report hydrothermal synthesis of reduced graphene oxide (RGO) supported NiMoO₄-nanorods (NRs) nanocomposites (NiMoO₄-NRs@RGO nanocomposites) for electro-catalysis of water to oxygen evolution and reduction reactions (OER/ORR). The prepared nanocomposites were characterized by x-ray diffraction (XRD), Raman, Fourier transform infrared (FTIR), high resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FESEM), energy dispersive and x-ray photoelectron spectroscopy (XPS) techniques. The electrochemical performances of NiMoO₄-NRs@RGO nanocomposites were examined in 0.5 M KOH (alkaline electrolyte) using cyclic voltammetry (CV), linear sweep voltammetry (LSV), Tafel and chronoamperometry (CA) electrochemical techniques at room temperature. The onset over-potentials of NiMoO₄-NRs@RGO nanocomposite for ORR and OER were found to be of ~75 and ~185 mV, respectively, while the Tafel slopes for OER and ORR were observed to be ~54 and ~245 mV/dec respectively. The involved electrons (i.e. 4e⁻) in redox reactions were calculated using rotating disc electrode experiments. Based on admirable electro-catalytic performance of NiMoO₄-NRs@RGO nanocomposites with low energy loss, suggesting it as cost effective and efficient OER/ORR electro-catalysts compared to noble metal electro-catalysts.

在本研究中，我们报告了水热合成还原型氧化石墨烯（RGO）负载的NiMoO _4-纳诺德（NRs）纳米复合材料（NiMoO ₄ -NRs @ RGO纳米复合材料），用于水的电催化氧生成和还原反应（OER / ORR） 。制备的纳米复合材料通过X射线衍射（XRD），拉曼光谱，傅立叶变换红外（FTIR），高分辨率透射电子显微镜（HRTEM），场发射扫描电子显微镜（FESEM），能量色散和X射线光电子能谱（ XPS）技术。NiMoO ₄的电化学性能在室温下，使用循环伏安法（CV），线性扫描伏安法（LSV），Tafel和计时电流法（CA）电化学技术，在0.5 M KOH（碱性电解质）中检查-NRs @ RGO纳米复合材料。NiMoO ₄ -NRs @ RGO纳米复合材料对ORR和OER的起始过电势分别为〜75和〜185 mV，而对OER和ORR的Tafel斜率则分别为〜54和〜245 mV / dec分别。所涉及的电子（即4E ^- ）在氧化还原反应使用旋转圆盘电极实验计算。基于具有低能量损失的NiMoO ₄ -NRs @ RGO纳米复合材料令人赞叹的电催化性能，表明与贵金属电催化剂相比，它是具有成本效益和高效的OER / ORR电催化剂。