High-performance supercapacitor electrodes based on NiMoO 4 nanorods
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High-performance supercapacitor electrodes based on NiMoO4 nanorods Yong Zhang1,a) , Cui-rong Chang2, Hai-li Gao2,b), Shi-wen Wang2, Ji Yan2, Ke-zheng Gao2, Xiao-dong Jia2, He-wei Luo2, Hua Fang2, Ai-qin Zhang2, Li-zhen Wang2 1 Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, People’s Republic of China; and Henan Provincial Key Laboratory of Surface & Interface Science, Zhengzhou University of Light Industry, Zhengzhou 450002, China 2 Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, People’s Republic of China a) Address all correspondence to this author. e-mail: [email protected] b) e-mail: [email protected]
Received: 14 March 2019; accepted: 18 April 2019
Novel NiMoO4-integrated electrode materials were successfully prepared by solvothermal method using Na2MoO42H2O and NiSO46H2O as main raw materials, water, and ethanol as solvents. The morphology, phase, and structure of the as-prepared materials were characterized by SEM, XRD, Raman, and FT-IR. The electrochemical properties of the materials in supercapacitors were investigated by cyclic voltammetry, constant current charge–discharge, and electrochemical impedance spectroscopy techniques. The effects of volume ratio of water to ethanol (W/E) in solvent on the properties of the product were studied. The results show that the pure phase monoclinic crystal NiMoO4 product can be obtained when the W/E is 2:1. The diameter and length are 0.1–0.3 lm and approximately 3 lm, respectively. As an active material for supercapacitor, the NiMoO4 nanorods material delivered a discharge specific capacitance of 672, 498, and 396 F/g at a current density of 4, 7, and 10 A/g, respectively. The discharge specific capacitance slightly decreased from 815 to 588 F/g with a retention of 72% after 1000 cycles at a current density of 1 A/g. With these superior capacitance properties, the novel NiMoO4 integrated electrode materials could be considered as promising material for supercapacitors.
Introduction In recent years, because of the novel physical and chemical properties, metal molybdate materials have extensive potential applications in many fields such as photoelectronic properties [1], humidity sensors [2], photocatalysis [3], supercapacitors [4], and lithium ion batteries [5]. Among them, supercapacitors are widely used in electric vehicles, mobile electronic devices, and high-power electronic products because of their high power density, ultrafast charge and discharge, and good cycle life [6, 7, 8]. In pseudocapacitor electrode materials, many transition metal oxides, especially binary metallic oxides, such as NiCo2O4 [9], CoMoO4 [10], and MnMoO4 [11], are expected to be the ideal electrode materials for supercapacitors because of their higher oxidation state, larger conductivity, and wider electrochemical window range [12]. Among these bimetal oxide electrode materials, NiMoO4 electrode materials have great potential applications in supercapacitors, because th
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