文献类型：期刊文献

英文题名：Ultra-micropore confinement effect in physical activated carbon sphere enables low-temperature electrical double-layer capacitance

作者：Liu, Baishan[1];Wu, Ziling[1];Hu, Jingwei[1];Yu, Huimei[2];Zhang, Yongzheng[1];Wang, Yanli[1];Zhan, Liang[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Green Chem Engn & Ind Catalysis, Key Lab Specially Funct Polymer Mat & Related Tech, State Key Lab Chem Engn,Minist Educ, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2025

卷号：307

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20250717865973);WOS:【SCI-EXPANDED(收录号:WOS:001427456200001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (No. 22075081, 52372045) , the Fundamental Research Funds for the Central Universities (JKD01231701) , China Postdoctoral Science Foundation (No. 2023M731084) . Y. Z. thanks the Shanghai Super Postdoctoral Incentive Program. The authors thank the Research Center of Analysis and Test of East China University of Science and Technology for the assistance with the characterization.

语种：英文

外文关键词：Activated carbon; Physical activation; Electrical double-layer capacitor; Ultra-micropore confinement effect; Low-temperature performance

摘要：Activated carbon with a high specific surface area used as electrical double-layer capacitor electrodes is commonly produced by chemical activation, while chemical activation processes are frequently associated with high pollution and costs. Herein, polystyrene-divinylbenzene-based activated carbon spheres (ACS) with large specific surface area were prepared through physical activation, in which the hierarchical porous structure provides a more favorable route for electrolyte ions penetration and transport. As a result, the supercapacitors utilizing ACS electrodes exhibit higher capacitance (108.5F/g at 1 A/g) and better rate performance. The assembled EDLCs not only stabilize for 30,000 cycles with capacity retention of 92.4% but also possess a superior rate performance even at 0 degrees C. In situ electrochemical quartz crystal microbalance reveals that eliminating the ultra-micropore confinement effect can boost ions storage. This study not only shows an understanding of the charge storage mechanism of EDLCs but also provides a novel possibility for the practical application.