Compacting Electric Double Layer Enables Carbon Electrode with Ultrahigh Zn Ion Storage Capability. (22nd November 2022)

• Record Type: Journal Article
• Authors: Shi, Xin; Xie, Jinhao; Yang, Fan; Wang, Fuxin; Zheng, Dezhou; Cao, Xianshuo; Yu, Yanxia; Liu, Qi; Lu, Xihong
• Is Part Of: Angewandte Chemie. Volume 134:Number 51(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-11-22
• Subjects: Amino Functional Groups -- Aqueous Zn Ion Hybrid Supercapacitor -- Carbon Electrode -- Electric Double Layer -- Surface Charge Modulation; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202214773
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Carbon‐based cathodes for aqueous zinc ion hybrid supercapacitors (ZHSCs) typically undergo low Zn ion storage capability due to their electric double layer capacitance (EDLC) energy storage mechanism that is restricted by specific surface area and thickness of electric double layer (EDL). Here, we report a universal surface charge modulation strategy to effectively enhance the capacitance of carbon materials by decreasing the thickness of EDL. Amino groups with lone pair electrons were chosen to increase the surface charge density and enhanced the interaction between carbon electrode and Zn ions, thus effectively compacting the EDL. Consequently, amino functionalized porous carbon based ZHSCs can deliver an ultrahigh capacity of 255.2 mAh g −1 along with excellent cycling stability (95.5 % capacity retention after 50 000 cycles) in 1 M ZnCl2 electrolyte. This study demonstrates the feasibility of EDL modified carbon as Zn 2+ storage cathode and great prospect for constructing high performance ZHSCs. Abstract : The electrical double layer (EDL) of carbon electrode can be compacted via surface charge modulation strategy to boost Zn ion storage capability. Zn//amino functionalized carbon Zn ion hybrid supercapacitor can deliver an ultrahigh capacity of 255.2 mAh g −1 as well as excellent cycling stability.