TY - JOUR
T1 - Recent Advances of Asymmetric Supercapacitors
AU - Wu, Nannan
AU - Bai, Xue
AU - Pan, Duo
AU - Dong, Binbin
AU - Wei, Renbo
AU - Naik, Nithesh
AU - Patil, Rahul Rangrao
AU - Guo, Zhanhu
N1 - Funding Information:
The authors acknowledge the support from Shandong University of Science and Technology research fund (01040125215). This article is part of the Hall of Fame articles series, which highlights the work of top and interface and surface scientists. Advanced Materials Interfaces
Publisher Copyright:
© 2020 Wiley-VCH GmbH
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2021/1/8
Y1 - 2021/1/8
N2 - Asymmetric supercapacitors (ASCs) have attracted significant attentions worldwide owing to their wider voltage window compared with symmetric supercapacitors (SCs). Through combinations of two electrodes with different charge storage mechanisms or different redox reactions, extended operating voltage window can be realized for ASCs. In this article, first the ASCs are classified into two types based on different charge storage mechanisms: electric double-layer capacitive (EDLC)//pseudocapacitive-type ASCs and EDLC//battery-type hybrid SCs. For the EDLC/pseudocapacitive-type ASC, carbon materials are adopted as anode and transition metal oxides including MnO2, RuO2, etc., are utilized as cathodes. For EDLC//battery-type hybrid SCs, carbon materials as anode are combined with metal oxide/hydroxide such as NiO, and Ni(OH)2, etc., as cathode. Recently, Li-ion-based ASCs composed of carbon materials and Li-ion battery-type electrode materials with a Li-containing organic electrolyte show great potentials to be promising alternatives. Some metal oxides/nitrides including InO2, Bi2O3, Fe3O4, Fe2O3, and VN can work in a negative potential range. By coupling another battery/pseudocapacitive electrode, all redox-type ASCs are assembled and their electrochemical performances are widely studied. Then, based on the above categories recent advances of ASCs are summarized. Finally, the challenges and prospects for the development of ASCs are pointed out from perspectives of this study.
AB - Asymmetric supercapacitors (ASCs) have attracted significant attentions worldwide owing to their wider voltage window compared with symmetric supercapacitors (SCs). Through combinations of two electrodes with different charge storage mechanisms or different redox reactions, extended operating voltage window can be realized for ASCs. In this article, first the ASCs are classified into two types based on different charge storage mechanisms: electric double-layer capacitive (EDLC)//pseudocapacitive-type ASCs and EDLC//battery-type hybrid SCs. For the EDLC/pseudocapacitive-type ASC, carbon materials are adopted as anode and transition metal oxides including MnO2, RuO2, etc., are utilized as cathodes. For EDLC//battery-type hybrid SCs, carbon materials as anode are combined with metal oxide/hydroxide such as NiO, and Ni(OH)2, etc., as cathode. Recently, Li-ion-based ASCs composed of carbon materials and Li-ion battery-type electrode materials with a Li-containing organic electrolyte show great potentials to be promising alternatives. Some metal oxides/nitrides including InO2, Bi2O3, Fe3O4, Fe2O3, and VN can work in a negative potential range. By coupling another battery/pseudocapacitive electrode, all redox-type ASCs are assembled and their electrochemical performances are widely studied. Then, based on the above categories recent advances of ASCs are summarized. Finally, the challenges and prospects for the development of ASCs are pointed out from perspectives of this study.
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U2 - 10.1002/admi.202001710
DO - 10.1002/admi.202001710
M3 - Review article
AN - SCOPUS:85096876231
SN - 2196-7350
JO - Advanced Materials Interfaces
JF - Advanced Materials Interfaces
ER -