新型炭材料2023，Vol.38Issue(3)：522-533,12.DOI:10.1016/S1872-5805(23)60733-4
优化炭表面氧官能团增强锌离子电容器的电容性能
Optimizing oxygen substituents of a carbon cathode for improved capacitive behavior in ethanol-based zinc-ion capacitors
摘要
Abstract
Zinc ion capacitors(ZICs)have been widely studied in recent years due to their high energy density,excellent rate cap-ability,long cycling life and low cost.The incorporation of oxygen functional groups(OFGs)on the surface of the carbon-based cathodes is an effective strategy for improving the capacitive performance of aqueous ZICs.However,whether their presence helps improve the capacitance of ethanol(EtOH)-based ZICs has not been investigated.In this work,a combination of nitric acid oxidation and thermal treatment was used to regulate the OFGs on the activated surface of the carbon cathode.The optimized sample had a high specific capacitance of 195 F g-1 at 1 A g-1 using ZnCl2/EtOH as the electrolyte,i.e.,a 56％increase compared to an unmodi-fied cathode(125 F g-1).ZICs also shown excellent stability for more than 16 000 cycles at 3 A g-1,while maintaining 100％ cou-lombic efficiency.This significantly improved performance is attributed to the presence of OFGs,especially carboxyl and ester groups,which provide abundant electrochemical active sites for redox reaction with the zinc ions.This study reports a significant im-provement in the specific capacitance of carbon cathodes for commercial EtOH-based ZIC systems.关键词
锌离子电容器/氧官能团/乙醇/活性炭/比电容Key words
Zinc-ion capacitors/Oxygen functional groups/Ethanol/Activated carbon/Specific capacitance分类
化学化工引用本文复制引用
袁平,肖浩鸣,李均益,罗俊辉,罗先游,陈大明,李德,陈永..优化炭表面氧官能团增强锌离子电容器的电容性能[J].新型炭材料,2023,38(3):522-533,12.基金项目
This work was financially supported by National Natural Science Foundation of China(52062012),Guangdong Province Key Discipline Construction Project(2021ZDJS102),the Innovation Team of Uni-versities of Guangdong Province(2022KCXTD030,2020KCXTD011),the Special Fund for Science and Technology Innovation Cultivation of Guangdong University Students(pdjh2023b0549)and the Student Academic Fund of Foshan University(xsjj202206kjb02).国家自然科学基金(52062012) （52062012）
广东省重点学科建设项目(2021ZDJS102) （2021ZDJS102）
广东省高校创新团队(2022KCXTD030、2020KCXTD011) （2022KCXTD030、2020KCXTD011）
广东大学生科技创新培育专项资金(pdjh2023b0549) （pdjh2023b0549）
佛山科学技术学院学术基金(xsjj202206kjb02). （xsjj202206kjb02）
