文献类型：期刊文献

英文题名：Effects of Polyelectrolyte Surface Coating on the Energy Storage Performance in Supercapacitors

作者：Qiu, Genlong[1,2];Qiu, Qiyuan;Qing, Leying[3,4];Zhou, Jingmin[1,2];Xu, Xiaofei[3,4];Zhao, Shuangliang[1,2]

机构：[1]Guangxi Univ, Guangxi Key Lab Petrochem Resource Proc & Proc In, Nanning 530004, Peoples R China;[2]Guangxi Univ, Sch Chem & Chem Engn, Nanning 530004, Peoples R China; City Univ Hong Kong, Dept Phys, Kowloon, Hong Kong 999077, Peoples R China;[3]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：126

期号：19

起止页码：8218

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY C

收录：;EI(收录号：20222212171876);WOS:【SCI-EXPANDED(收录号:WOS:000804933700003)】；

基金：This work is supported by the National Natural Science Foundation of China (Nos. 21978079, 22178072, and U1707602) and the Guangxi Science and Technology Base and Talent Project (AD21220017).

语种：英文

外文关键词：Capacitance - Density functional theory - Electrodes - Plastic coatings - Polyelectrolytes - Storage (materials) - Supercapacitor

摘要：Polymer electrode materials are critical componentsto achieve the excellent energy storage performance (ESP) ofsupercapacitors, while the underlying microscopic mechanism bywhich the polymer structure on the electrode surface affects theenergy storage remains unclear. Herein, we explore the effects of apolyelectrolyte (PE) coating on the ESP of supercapacitors byusing the polymer density functional theory. The ESP isdetermined by the adsorption of free ions at the electrode surface,which is jointly affected by the interactions from both the chargedsurface and the anchored PE chains. Once the PE chains carry likecharges as the electrode, the energy density can be significantlypromoted by two orders of magnitude. However, if the PE chains carry opposite charges to the electrode, the energy density can besuppressed. The effect of PE coating on the capacitance is similar to that on the energy density if the surface voltage isfixed duringthe operation, and otherwise, if the surface charge density isfixed, the effect on the capacitance is opposite to that on the energydensity. This work provides a microscopic understanding of the complex polyelectrolyte coating'seffects on the ESP insupercapacitors.