Preparation of supercapacitor carbon by ionic liquid dissolution and its electrochemical properties

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Feb.2023, Vol.46 No.2: 246-253

DOI: 10.3969/j.issn.1003-5060.2023.02.016

Authors

XING Xianjun $ ^{1,2,3} $, LI Shan $ ^{2} $, WANG Wenquan $ ^{2} $, SONG Yuqiang $ ^{2} $, ZHANG Xianwen $ ^{4} $

(1. Institute of Advanced Energy Technology and Equipment, Hefei University of Technology, Hefei 230009, China; 2. School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China; 3. Anhui Institute of Metrology, Hefei 230051, China; 4. School of Automobile and Traffic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: The high cellulose waste paper was treated with selective surface dissolution (SSD) in inorganic ionic liquid, the colloidal precursor with swelling characteristics was obtained, and the pyrolysis at different temperatures was conducted to prepare biomass porous carbon. The specific surface area of the biomass porous carbon prepared at 800 ℃ was 1 276.3 m²/g. The electrochemical test results showed that it had high specific capacitance (271 F/g) and the capacitance was maintained at 90.3% after 1 000 cycles. In order to further improve the electrochemical performance of supercapacitor, 15 g $ \left(\mathrm{NH}_{4}\right)_{2}\mathrm{Fe}\left(\mathrm{SO}_{4}\right)_{2} \cdot 6\mathrm{H}_{2}\mathrm{O} $ was added into 1 mol/L $ H_{2}SO_{4} $ electrolyte, and the specific capacitance of supercapacitor was significantly improved. When the current density was 10 A/g, the specific capacitance of supercapacitor was 439 F/g, which was twice that of the original capacitor (221 F/g). The research results can provide reference for the preparation of porous carbon supercapacitors.

Keywords: ionic liquid; selective surface dissolution(SSD); porous carbon; supercapacitor; electrochemical property

作者信息

邢献军 $ ^{1,2,3} $，李珊 $ ^{2} $，王文泉 $ ^{2} $，宋雨蔷 $ ^{2} $，张贤文 $ ^{4} $

（1. 合肥工业大学先进能源技术与装备研究院，安徽合肥 230009；2. 合肥工业大学化学与化工学院，安徽合肥 230009；3. 安徽省计量科学研究院，安徽合肥 230051；4. 合肥工业大学汽车与交通工程学院，安徽合肥 230009）

摘要和关键词

摘要: 文章以高纤维素废纸屑为原料, 利用无机离子液体进行选择性表面溶解处理, 得到具有润胀特性的胶状前驱体, 在不同温度条件下热解制备生物质多孔碳。800 ℃下生物质多孔碳比表面积为 $ 1276.3 \, m^{2}/g $，电化学测试结果表明，其具有较高的比电容 (271 F/g)，经过 1000 次循环，电容保持率为 90.3%。为了进一步提升超级电容器的电化学性能，在 $ 1 \, mol/L \, H_{2}SO_{4} $ 电解液中加入 $ 15 \, \text{g} \, (\text{NH}_{4})_{2}\text{Fe}(\text{SO}_{4})_{2} \cdot 6\text{H}_{2}\text{O} $，超级电容器的比电容得到显著提升，电流密度为 10 A/g 时，比电容为 439 F/g，为原电容器 (221 F/g) 的 2 倍。研究结果可为生物质多孔碳超级电容器制备提供参考。

关键词: 离子液体；选择性表面溶解法；多孔碳；超级电容器；电化学性能

Funding

安徽省科技重大专项资助项目（202003c08020013）

合肥工业大学学报(自然科学版)

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