الفهرس 
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Abstract
Supercapacitors have the potential to be used in a variety of fields, including electric vehicles, a lot of research are focusing on unique electrode material to enhance capacitance and stability. Here-in, we have prepared nickel molybdate /activated carbon (AC) nanocomposites by a facile impregnation method which preserve the carbon surface area. In order to study how Nick-el-Molybdenum ratio affects the efficiency of the electrode, different ratios between Ni: Mo were prepared and tested as supercapacitors electrodes namely in the following ratios: 1:1, 1:2, 1:3, 1:4 & 1:5. (The X-ray diffraction, X-ray photoelectron spectroscopy, FESEM, HRTEM, and BET) de-vices were extensively used to analyze the structure of nanocomposites. The structure of the pre-pared nickel molybdates was discovered to be 2D hierarchical nanosheets which functionalized the carbon surface. Among all electrodes, the best molar ratio between Ni: Mo was found to be 1: 3 (NiMo3/AC) reaching (541 F.g-1) of specific capacitance at a current density (1A. g-1), and (67 W. h. Kg−1) of energy density at a power density of (487 W. Kg−1). Furthermore, after 4000 repetitive cycles at a large current density of 4 A.g-1, an amazing capacitance stability of 97.7% was maintained. This remarkable electrochemical activity for NiMo3/AC could be credited towards its 2D hierarchical structure which has a huge surface area (1703 m2‧g−1), high pore volume of (0.925 cm3‧g−1), and large particle sizes distribution.
Keywords: Activated carbon; nickel molybdate; hierarchical structure; nanocomposite; Supercapacitors.