硼掺杂石墨烯气凝胶的制备及在超级电容器中电化学性能研究

Synthesis of boron-doped graphene aerogel and its electrochemical application for supercapacitors

以氧化石墨烯(GO)为碳源,以硼酸为硼源,利用简单的一步水热合成法制备了稳定高性能的硼掺杂石墨烯气凝胶(BGA)。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、红外光谱(FT-IR)、热重分析(TGA)等技术手段表征了B-GA的表面形貌和化学状态,并且在三电极体系下测试了B-GA的电化学性能。实验结果显示,通过水热法成功地将硼元素掺入石墨烯的晶格内并使其表现出优异的热稳定性。B-GA在1 A/g的电流密度下的比电容高达267.1 F/g,这证实了B-GA作为超级电容器电极材料在储能领域的应用潜力。

The three-dimensional porous graphene aerogel is a novel material with excellent electrical conductivity,high mechanical strength,good thermal stability and outstanding electrochemical performance,which makes it widely be used in electrode materials of supercapacitors.A stable and high-performance boron-doped graphene aerogel(B-GA)was prepared by simple one-step hydrothermal synthesis with graphene oxide(GO)as carbon source and boric acid as boron source.The surface morphology and chemical state of B-GA were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),Fourier transform infrared spectrum(FT-IR),and thermogravimetric analysis(TGA),and the electrochemical properties of B-GA were tested under the threeelectrode system.The experimental results show that boron elements were successfully doped into the lattice of graphene by hydrothermal method and exhibited excellent thermal stability.The specific capacitance of B-GA at the current density of 1 A/g reaches 267.1 F/g,which also confirmed the potential of B-GA as a supercapacitor electrode in the field of energy storage.