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首页> 外文期刊>International Journal of Electrochemical Science >Effects of Electrode Mass-loading on the Electrochemical Properties of Porous MnO2 for Electrochemical Supercapacitor
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Effects of Electrode Mass-loading on the Electrochemical Properties of Porous MnO2 for Electrochemical Supercapacitor

机译：电极质量负荷对电化学超级电容器多孔MnO 2 电化学性能的影响

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摘要

Porous MnO2 nanostructure with large surface area and large pore volume was prepared by a facialchemical method in large scale. The physical properties of the as-prepared MnO2 were characterizedby X-ray diffraction (XRD) analysis, Brunauer-Emmett-Teller (BET) method and scanning electronmicroscope (SEM). The effect of electrode mass-loading on the electrochemical properties of MnO2electrodes was studied by cyclic voltammetry (CV), impedance spectrum test and chronopotentiometrymethods in 1.0M Na2SO4 solution. The results showed that the as-prepared MnO2 exhibited idealcapacitive behavior in a voltage window of 0~1.0V. With increasing of MnO2 mass from 5 to 25 mg-2 -1cm in electrode, the specific capacitance calculated from the CV curves at 2mV s decreased from-1 452 to 205 F g . Impedance spectrum tests indicated that the reduction of specific capacitance wasmainly due to the increase of charge transfer resistance and the slow ion diffusion in the thicker-2 electrode. Ragone plots indicated that the MnO2 electrode with 5mg cm mass-loading possessed good-1 -1 power-energy density characteristics. An energy density of 26.6Wh Kg still remained 24Wh Kg-1 -1 when the power density increased from 50 W Kg to 5 KW Kg . These results indicated that porousMnO2 and thinner mass loading is benefit for applications in electrochemical supercapacitor.
机译：通过表面化学方法大规模制备了具有大表面积和大孔体积的多孔MnO 2纳米结构。通过X射线衍射（XRD）分析，Brunauer-Emmett-Teller（BET）方法和扫描电子显微镜（SEM）表征了制得的MnO2的物理性质。通过循环伏安法（CV），阻抗谱测试和计时电位法在1.0M Na2SO4溶液中研究了电极质量负载对MnO2电极电化学性能的影响。结果表明，所制备的MnO2在0〜1.0V的电压范围内表现出理想的电容行为。随着电极中MnO2的质量从5 mg增加到25 mg-2 -1 cm，从CV曲线在2mV s计算出的比电容从1 452降低到205 F g。阻抗谱测试表明，比电容的减小主要是由于电荷转移电阻的增加和较厚2电极中离子扩散缓慢所致。 Ragone图表明质量负载为5mg cm的MnO2电极具有良好的-1 -1功率-能量密度特性。当功率密度从50 W Kg增加到5 KW Kg时，仍保持24Wh Kg-1 -1的26.6Wh Kg能量密度。这些结果表明多孔MnO 2和较薄的质量负载对于电化学超级电容器中的应用是有益的。

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