三维孔状石墨烯气凝胶是一种理想的超级电容器电极材料。以氧化石墨烯为碳源,SiO2为硅源,使用一步水热法合成了高孔隙率的硅掺杂石墨烯气凝胶(Si-GA)。通过扫描电子显微镜、X射线衍射仪和傅里叶变换红外光谱等多种表征方法,完整地揭示了Si-GA的形貌、晶体结构和化学组分。采用热重分析仪对样品进行热稳定性测试。结果表明,Si-GA在浓度1mol/L的KOH电解液中表现出超高的比电容(348.5F/g,1A/g)和优异的循环稳定性,这也说明Si-GA作为高性能超级电容器电极在能源领域具有广阔的应用前景。
3D porous graphene aerogels have become an ideal supercapacitor electrode material.Therefore,a stable and high-performance silicon-doped graphene aerogel (Si-GA) was prepared by simple one-step hydrothermal synthesis,in which graphene oxide (GO) and silicon dioxide(SiO2) were adopted as carbon source and silicon source.The morphology,crystal structure and chemical composition of Si-GA were characterized by scanning electron microscope (SEM),X-ray diffraction (XRD) and Fourier transform infrared spectrum (FT-IR),and the thermal decomposition of the sample was performed by thermal gravimetric analyzer (TGA).The experiment demonstrated that the as-made Si-GA revealed excellent capacitive behavior (348.5F/g at 1A/g) and long-term cycling stability in 1.0mol/L KOH electrolyte,which indicated the good potential of Si-GA as supercapacitors electrode for high-performance energy storage devices.
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