将无定型MnO2在1mol/L NaOH水溶液中150℃水热处理12 h后,得到了具有线团形貌的层状二氧化锰.利用XRD、SEM和低温N2吸-脱附等手段对样品的形貌和结构进行了表征.采用循环伏安、恒流充放电以及交流阻抗技术对样品的电化学性质进行了研究.研究结果表明,在三电极体系中,线团状MnO2在0～1.0 V(vs.SCE)的电压范围内具有较好的电容性质,其质量比电容为154 F/g.利用线团状MnO2为正极,石墨烯为负极以及1 mol/L Na2SO4水溶液为电解液组装了不对称型的电化学电容器.电化学测试表明,该电容器可在0～1.8V的电压范围内可逆循环,其能量密度为21.6 W·h/kg,远远高于基于线团状MnO2(4.86W·h/kg)和石墨烯(4.3W·h/kg)的对称型电容器.
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