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DOI	10.1039/c7ee02584j
	Indole-based conjugated macromolecules as a redox-mediated electrolyte for an ultrahigh power supercapacitor
	Xiong T.; Lee W.S.V.; Chen L.; Tan T.L.; Huang X.; Xue J.
发表日期	2017
ISSN	17545692
起始页码	2441
结束页码	2449
卷号	10 期号:11
英文摘要	Balancing energy density and power density has been a critical challenge since the inception of supercapacitors. Introducing redox-active additives in the supporting electrolyte has been shown to increase the energy density, however the power density and cycling stability are severely hampered in the process. Herein, an extensively conjugated indole-based macromolecule consisting of 5,6-dihydroxyindole/5,6-quinoneindole motifs, prepared by electrochemical polymerization of dopamine under acidic conditions, was employed as a redox-active additive. By utilizing the conjugation effect, the HOMO-LUMO gap (HLG) of the extensively conjugated indole-based macromolecule was reduced to ca. 2.08 eV, which enhanced the electronic transfer kinetics, in turn improving the power density and reversibility of redox reactions. When coupled with a porous honeycomb-like carbon (PHC) electrode, the assembled supercapacitor delivered an excellent rate performance with a high specific capacitance of 205 F g-1 at 1000 A g-1. This work reports one of the highest power densities recorded at 153 kW kg-1 for redox-mediated electrolyte systems with a respectable energy density of 8.8 W h kg-1. In addition to an excellent cycling stability of 97.1% capacitance retention after 20000 charge/discharge cycles, the conjugation degree has to be considered when engineering the redox-active electrolyte so as to improve the power density and stability. © The Royal Society of Chemistry 2017.
英文关键词	Additives; Capacitance; Carbon; Electrolytes; Electrolytic capacitors; Macromolecules; Polycyclic aromatic hydrocarbons; Supercapacitor; Capacitance retention; Charge/discharge cycle; Conjugation effects; Critical challenges; Electrolyte systems; Electronic transfers; High specific capacitances; Supporting electrolyte; Redox reactions; additive; chemical compound; electrochemical method; electrolyte; electron; equipment; performance assessment; polymerization; reaction kinetics; redox conditions
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190381
作者单位	National University of Singapore, Department of Materials Science and Engineering, Singapore, 117573, Singapore; Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore, 117546, Singapore; Department of Chemistry, Tianjin University, Tianjin, 300072, China; Institute of High Performance Computing, A STAR, 1 Fusionopolis Way #16-16 Connexis, Singapore, 138632, Singapore
推荐引用方式 GB/T 7714	Xiong T.,Lee W.S.V.,Chen L.,et al. Indole-based conjugated macromolecules as a redox-mediated electrolyte for an ultrahigh power supercapacitor[J],2017,10(11).
APA	Xiong T.,Lee W.S.V.,Chen L.,Tan T.L.,Huang X.,&Xue J..(2017).Indole-based conjugated macromolecules as a redox-mediated electrolyte for an ultrahigh power supercapacitor.Energy & Environmental Science,10(11).
MLA	Xiong T.,et al."Indole-based conjugated macromolecules as a redox-mediated electrolyte for an ultrahigh power supercapacitor".Energy & Environmental Science 10.11(2017).