气相还原法制备石墨烯泡沫电极板及其电容性质研究

Preparation of Graphene Sponge Electrode by Gas Phase Reduction and Its Capacitor Properties

石墨烯泡沫因其优异性质被用作超级电容器的极板材料。本文用气相还原法制备石墨烯泡沫极板,尺寸、形状可控并形成较稳定的三维多孔结构。通过电化学测试对石墨烯泡沫极板电容的性质进行分析。结果表明,该法克服了传统石墨烯电极易团聚、不均匀的缺点,在循环伏安测试中表现出良好的可逆性。计时电流图表明电容在充放电过程中电流稳定,转换时损耗较小。交流阻抗、开路电位和时间阻抗测试结果也证明石墨烯泡沫具有较好的性质。

Graphene finds applications in ultracapacitor due to the outstanding properties. Graphene sponge electrode by gas phase reduction was prepared,during the size and shape of electrode were well controlled and the 3D- strucutre of porous sponge was formed. Through the electrochemical measurements,the good properties of graphene sponge electrode were analyzed. The results indicated that the protocol here overcame the aggregation of graphene sheets and the heterogeneous nature. The good reversibility of graphene sponge electrode was reflected by cyclic voltammetry curve. The chronoamperometry result indicated that the current of graphene sponge capacitor was stable during the charge / discharge process and the energy loss was low. AC impedance,open circuit potential and time impedance results also confirmed the good properties of graphene sponge electrode.