Non Platinum group metal (PGM) catalyst received huge attention for the electrochemical water splitting to produce hydrogen. Among different non PGM groups nickel (Ni), nickel oxide (NiO), nickel molybdenum oxide (Ni-MoO_x) show very good activity towards hydrogen evolution reaction (HER). In this work, Ni and Ni-MoO₂ nanostructured particles were impregnated on the reduced graphene oxide (RGO) sheets and utilized for hydrogen evolution reaction (HER) in highly alkaline medium (1 M KOH). Electrochemical studies have been done by linear sweep voltammetry (LSV) which concludes that there is decrease in overpotential of about 124 mV at 10 mA cm⁻² as we switch from Ni/RGO to Ni-MoO₂/RGO. To understand reaction mechanism, temperature dependent HER have also performed within the temperature range of 293–333 K respectively. Electrochemical impedance spectroscopy (EIS), Arrhenius activation energy calculations concluded enhanced catalytic activity of Ni-MoO₂/RGO. Temperature-controlled experimental data clearly confirm that addition of molybdenum leads to reduction in energy barrier for hydrogen evolution in Ni-MoO₂/RGO.

非铂族金属（PGM）催化剂因电化学水分解产生氢而备受关注。在不同的非PGM基团中，镍（Ni），氧化镍（NiO），氧化钼镍（Ni-MoO _x）对氢析出反应（HER）表现出非常好的活性。在这项工作中，将Ni和Ni-MoO ₂纳米结构颗粒浸渍在还原的氧化石墨烯（RGO）片材上，并用于在高碱性介质（1 M KOH）中的氢释放反应（HER）。通过线性扫描伏安法（LSV）进行了电化学研究，得出的结论是，当我们从Ni / RGO切换到Ni-MoO ₂时，在10 mA cm ^-2时过电势降低约124 mV/ RGO。为了解反应机理，温度依赖性HER分别在293–333 K的温度范围内进行。电化学阻抗谱（EIS）， Arrhenius活化能计算得出结论，增强了Ni-MoO₂/ RGO的催化活性。温度控制的实验数据清楚地证实，添加钼会导致Ni-MoO₂/ RGO中析氢的能垒降低。