期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 51, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202214773
关键词
Amino Functional Groups; Aqueous Zn Ion Hybrid Supercapacitor; Carbon Electrode; Electric Double Layer; Surface Charge Modulation
资金
- National Natural Science Foundation of China [21902064, U22005222]
- Guangdong Province Innovation and Strong School Project [2020ZDZX2004, 2020KQNCX087]
- Science Foundation for Young Teachers of Wuyi University [2019AL022, 5041700133]
- Joint Science Foundation of Wuyi University and HK and Macao [2019WGALH14]
- National Supercomputing Center in Guangzhou (NSCC-GZ)
This study proposes a universal surface charge modulation strategy to enhance the capacitance of carbon materials by reducing the thickness of the electric double layer (EDL). Amino groups are used to increase the surface charge density and enhance the interaction between carbon electrodes and zinc ions, leading to a compacted EDL. The amino-functionalized porous carbon-based ZHSCs demonstrate a high capacity and excellent cycling stability in 1 M ZnCl2 electrolyte.
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.
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