期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 31, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201802088
关键词
first-principles calculations; graphene; quinones; redox actives; supercapacitors
类别
资金
- National Key Basic Research Program of China [2014CB932400]
- National Natural Science Foundation of China [U1401243]
- National Nature Science Foundation of China [51232005]
- Australian Research Council [ARC DP170100436]
- Shenzhen Technical Plan Project [JCYJ20150529164918735, CYJ20170412170911187, QJSCX20160226191136]
- Guangdong Technical Plan Project [2015TX01N011]
Redox active organic quinones are potentially low cost, sustainable, and high-energy pseudocapacitive materials due to their fast and reversible redox reactivity. However, their electrically insulating nature prevents any practical application. Herein, for the first time, sodium anthraquinone-2-sulfonate (AQS) is examined as an organic redox-active compound and highly conductive graphene nanosheets are incorporated to enhance the electronic conductivity. The -SO3- functional group of AQS offers excellent hydrophilicity, which promotes the molecular level binding of AQS with reduced graphene oxide (rGO) and leads to a 3D interconnected xerogel (AQS@rGO). The composite exhibits a high specific capacitance of 567.1 F g(-1) at 1 A g(-1) with a stable capacity retention of 89.1% over 10 000 cycles at 10 A g(-1). More importantly, the optimized composite maintains a high capacitance of 315.1 F g(-1) even at 30 A g(-1) due to the high pseudocapacitance of AQS and the capacitive contribution of rGO. First-principles calculations further elucidate that AQS offers strong adhesion to rGO sheets with the formation of a space-charge layer, which is favorable for the pseudocapacitance of AQS. This work opens a new avenue for developing high-performance supercapacitors though rational combination of redox organic molecules with highly conductive graphene.
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