Ion dynamics into different pore size distributions in supercapacitors under compression

作     者：João Pedro Aguiar dos Santos Cesar J.B.Pagan Rafael Vicentini Reinaldo F.Teófilo Renato Beraldo Leonardo M.Da Silva Hudson Zanin Jo?o Pedro Aguiar dos Santos;Cesar J.B.Pagan;Rafael Vicentini;Reinaldo F.Teófilo;Renato Beraldo;Leonardo M.Da Silva;Hudson Zanin

作者机构：Brazilian Renewable EnergiesCenter for Innovation on New EnergiesSchool of Electrical and Computer EngineeringUniversity of CampinasAv.Albert Einstein 40CampinasSP13083-852Brazil School of Electrical and Computer EngineeringUniversity of CampinasSP 13083-852Brazil Multivariate Chemical Data Analysis LaboratoryDepartment of ChemistryUniversidade Federal de Viçosa36570-900 ViçosaMGBrazil Department of ChemistryLaboratory of Fundamental and Applied ElectrochemistryFederal University of Jequitinhonha and Mucuri's ValleyRodovia MGT 367km 5835000 Alto da Jacuba39100-000DiamantinaMGBrazil 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2023年第80卷第5期

页      面：110-119,I0004页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0714[理学-统计学（可授理学、经济学学位）] 0701[理学-数学] 

基　　金：the financial support from the Brazilian funding agencies CNPq(301486/2016-6) FAPESP(2014/02163-7,2017/11958-1,2018/20756-6) the support from Shell。 

主　　题：Mechanic compression Pore size distribution lon dynamics Activated carbon Supercapacitors 

摘      要：Compressing supercapacitor(SCs)electrode is essential for improving the energy storage characteristics and minimizing ions’distance travel,faradaic reactions,and overall ohmic resistance.Studies comprising the ion dynamics in SC electrodes under compression are still rare.So,the ionic dynamics of five aqueous electrolytes in electrodes under compression were studied in this work for tracking electrochemical and structural changes under mechanical stress.A superionic state is formed when the electrode is compressed until the micropores match the dimensions with the electrolyte’s hydrated ion sizes,which increases the capacitance.If excessive compression is applied,the accessible pore regions decrease,and the capacitance drops.Hence,as the studied hydrated ions have different dimensions,the match between ion/pore sizes differs.To the LiOH and NaClO4electrolytes,increasing the pressure from 60 to 120 and 100 PSI raised the capacitance from 13.5 to 35.2 F g^(-1)and 30.9 to 39.0 F g^(-1),respectively.So,the KOH electrolyte with the lowest and LiCl with the biggest combination of hydrated ion size have their point of maximum capacitance(39.5 and 36.7F g^(-1))achieved at 140 and 80 PSI,respectively.To LiCl and KCl electrolytes,overcompression causes a drop in capacitance higher than 23%.