TY - JOUR
T1 - Compacting Electric Double Layer Enables Carbon Electrode with Ultrahigh Zn Ion Storage Capability
AU - Shi, Xin
AU - Xie, Jinhao
AU - Yang, Fan
AU - Wang, Fuxin
AU - Zheng, Dezhou
AU - Cao, Xianshuo
AU - Yu, Yanxia
AU - Liu, Qi
AU - Lu, Xihong
PY - 2022/12/19
Y1 - 2022/12/19
N2 - 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 Zn2+ storage cathode and great prospect for constructing high performance ZHSCs.
AB - 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 Zn2+ storage cathode and great prospect for constructing high performance ZHSCs.
KW - Amino Functional Groups
KW - Aqueous Zn Ion Hybrid Supercapacitor
KW - Carbon Electrode
KW - Electric Double Layer
KW - Surface Charge Modulation
UR - http://www.scopus.com/inward/record.url?scp=85143204791&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85143204791&origin=recordpage
U2 - 10.1002/anie.202214773
DO - 10.1002/anie.202214773
M3 - RGC 21 - Publication in refereed journal
C2 - 36300583
SN - 1433-7851
VL - 61
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 51
M1 - e202214773
ER -