材料科学
气凝胶
超级电容器
比表面积
聚酰亚胺
扫描电子显微镜
正硅酸乙酯
化学工程
碳化
电极
碳纤维
电化学
复合材料
纳米技术
图层(电子)
复合数
化学
有机化学
催化作用
物理化学
工程类
作者
Shi Liu,Jianqi Ji,Yixing Wang,Cenqi Yan,Huaiyong Bai,Jiaqiang Qin,Pei Cheng
出处
期刊:JPhys materials
[IOP Publishing]
日期:2022-12-20
卷期号:6 (1): 015002-015002
被引量:1
标识
DOI:10.1088/2515-7639/acaa59
摘要
Abstract A series of polyimide (PI)/SiO 2 aerogel microspheres were prepared by using polyamide acid salt and hydrolyzed tetraethyl orthosilicate based on the reverse-phase emulsion method. Then, PI/SiO 2 aerogel microspheres were carbonized and etched to obtain carbon aerogel microspheres (CAMs). Scanning electron microscope, transmission electron microscope and nitrogen isothermal adsorption were used to characterize the micro-morphology and pore structure of the microspheres; and electrochemical workstation was used to test the electrochemical performance of the CAMs. The results showed that CAMs with different pore structures and specific surface area were obtained by adjusting the content of SiO 2 . Highest specific surface area of 1166.9 m 2 g −1 and a total pore volume of 1.2369 cm 3 g −1 were achieved at a SiO 2 content of 50%. When used as the electrode materials for supercapacitors, these CAMs demonstrated a maximum specific capacitance of 125.1 F g −1 in a three-electrode system and a maximum capacitance of 53.3% at 30 A g −1 . This article provides a new strategy for the preparation of CAMs with high specific surface area by using linear PI precursor and SiO 2 support skeleton.
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