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Supramolecular-induced confining methylene blue in three-dimensional reduced graphene oxide for high-performance supercapacitors
被引:34
作者:
Zhou, Xiaoping
[1
,3
]
Meng, Tao
[4
]
Yi, Fenyun
[1
,2
]
Shu, Dong
[1
,2
]
Han, Dongmei
[4
]
Zhu, Zhenhua
[1
]
Gao, Aimei
[1
,2
]
Liu, Cong
[1
]
Li, Xia
[1
]
Yang, Kemeng
[1
]
Yi, Hong
[1
]
机构:
[1] South China Normal Univ, Sch Chem, Guangzhou 510006, Peoples R China
[2] Minist Educ, Engn Res Ctr Mat & Technol Electrochem Energy Sto, Guangzhou 510006, Peoples R China
[3] Lingnan Normal Univ, Sch Chem & Chem Engn, Zhanjiang 524048, Peoples R China
[4] Sun Yat Sen Univ, Sch Chem, Key Lab Low Carbon Chem & Energy Conservat Guangd, Guangzhou 510275, Guangdong, Peoples R China
基金:
中国国家自然科学基金;
关键词:
Pseudocapacitor;
Reduced graphene oxide;
Methylene blue;
Confining;
Supramolecular;
GAS-FOAMING METHOD;
DOPED GRAPHENE;
ELECTROCHEMICAL CAPACITORS;
TEMPLATE SYNTHESIS;
CARBON NANOSHEETS;
SCALABLE STRATEGY;
REDOX ADDITIVES;
ELECTRODE;
COMPOSITES;
ADSORPTION;
D O I:
10.1016/j.jpowsour.2020.228554
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
Adding redox-active species into the electrolyte can supply extra capacitance to the carbon-based super capacitors. However, the devices may suffer from serious self-discharge caused by the shuttling and intermixing of charged active species between the electrodes. Confining these active species in a solid-state electrode material is an effective strategy to avoid this. Inspired by this, we fabricate a three-dimensional reduced graphene oxide confined methylene blue composite via a supramolecular strategy, combined with a hydrothermal reduction and a freeze-drying process. Benefited from the porous and conductive structure of the product, the fast-reversible electrochemical reaction of methylene blue, and the spatial confinement effect of the methylene blue confined in reduced graphene oxide, the as-prepared product exhibits a high-rate capability (311 and 262 F g(-1) at 1 and 20 A g(-1), respectively) and an excellent cycle stability (96% capacitance retention after 10000 cycles) in a three electrode system. Moreover, a solid-state symmetric supercapacitor device based on the as-prepared product delivers the maximum energy density of 8.2 Wh kg(-1) and outstanding cycle stability. This supramolecularinduced confining active species in reduced graphene oxide strategy provides insight into the fabrication of other high-performance graphene-based pseudocapacitors.
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页数:11
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