水热合成还原氧化石墨烯复合氧化镍超级电容器电极材料（英文）

Hydrothermal Synthesis of Reduced Graphene Oxide/Nickel Oxide Composite as Electrode Materials for Supercapacitor

通过水热条件下合成氧化镍前驱物基础上同步还原氧化石墨烯,随后在空气中退火后制备了氧化镍复合还原氧化石墨烯电极材料。电化学性能测试表明,复合体系中,还原氧化石墨烯为体系中电子传导提供了良好的导电网络,因此,在电流密度0.5A/g下,其比电容值达到了360F/g高于单一氧化镍电极材料的310F/g;同时,在对复合材料的循环寿命特性的测试结果表明,由于还原氧化石墨烯提供了氧化镍电化学过程中所需的体积弛豫空间,复合电极材料的循环寿命也得到了明显的改善。由此可见,通过采用上述简单有效的制备方案可以获得性能更为优异的超级电容器电极材料,为相关电极材料的制备提供了必要的实验基础。

Nickel oxide(Ni O) and reduced graphene oxide(RGO) composite was synthesized by a hydrothermal method followed by calcination in air. Ni O/RGO nanosheets were directly functionalized as supercapacitor electrodes for potential energy storage applications. The results show that the specific capacitance of Ni O and RGO/Ni O reach 310 F/g and 360 F/g, respectively, at a current density of 0.5 A/g. The RGO/Ni O composite shows slightly improved electrochemical performance in comparison with pure Ni O, which is attributed to the fact that RGO increases electron transfer rate and provides the volume relaxation space for Ni O volume change during the electrochemical process.