MnO2/碳纳米球电化学超级电容器电极材料的制备与性能研究

利用水热法合成了纳米棒状的MnO_2/碳纳米球(CNPs)作为电化学超级电容器的电极材料.利用场发射扫描电镜(FESEM)、X射线衍射光谱分析(XRD)对样品的微观形貌、物相进行分析;利用循环伏安法和恒电流充放电测试材料的电化学性能.结果表明:纳米棒状MnO_2/CNPs复合材料具有良好的电化学性能.在0.1 A/g的电流密度,1 mol/L Na_2SO_4电解液中,电极材料的比电容高达305.6 F/g,远高于纯碳球的比电容(49.3 F/g),当电流密度增至5 A/g时,材料的比电容为235 F/g,比电容仍能保持76.9%.

Preparation and property study of MnO2/CNPs as electrode materials of electrochemical supercapacitors

MnO₂ nanorods deposited on carbon nanospheres (MnO₂/CNPs) as electrode materials of electrochemical supercapacitors have been synthesized via a hydrothermal synthesis.The micro morphologies and phases of the as-prepared MnO₂/CNPs were characterized by field emission scanning electro microscopy(FESEM) and X-ray diffraction(XRD).The electrochemical properties of nanomaterials were tested by cyclic voltammetry and galvanostatic charge-discharge.At a current density of 0.1 A/g using 1 mol/L Na₂SO₄ as electrolyte,the as-prepared MnO₂/CNPs exhibit excellent specific capacitance of 305.6 F/g,far larger than carbon nanospheres (49.3 F/g).At a current density of 5 A/g,the specific capacitance of MnO₂/CNPs is 235 F/g,which is 76.9% of the specific capacitance under 1 A/g current density.These results demonstrated that MnO₂/CNPs may show potential application for electrode materials in electrochemical supercapacitors.