| Electrochemical behavior of single-walled carbon nanotube supercapacitors under compressive stress. | |
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MedLine Citation:
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PMID: 20828214 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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The effect of compressive stress on the electrochemical behavior of flexible supercapacitors assembled with single-walled carbon nanotube (SWNT) film electrodes and 1 M aqueous electrolytes with different anions and cations were thoroughly investigated. The under-pressed capacitive and resistive features of the supercapacitors were studied by means of cyclic voltammetry measurements and electrochemical impedance analysis. The results demonstrated that the specific capacitance increased first and saturated in corresponding decreases of the series resistance, the charge-transfer resistance, and the Warburg diffusion resistance under an increased pressure from 0 to 1723.96 kPa. Wettability as well as ion-size effect of different aqueous electrolytes played important roles to determine the pressure dependence behavior of the suerpcapacitors under an applied pressure. An improved high-frequency capacitive response with 1172 Hz knee frequency, which is significantly higher compared to reported values, was observed under the compressive pressure of 1723.96 kPa, indicating an improving and excellent high-power capability of the supercapacitors under the pressure. The experimental results and the thorough analysis described in this work not only provide fundamental insight of pressure effects on supercapacitors but also give an important guideline for future design of next generation flexible/stretchable supercapacitors for industrial and consumer applications. |
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Authors:
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Xin Li; Jiepeng Rong; Bingqing Wei |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: ACS nano Volume: 4 ISSN: 1936-086X ISO Abbreviation: ACS Nano Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-10-26 Completed Date: 2011-02-02 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101313589 Medline TA: ACS Nano Country: United States |
Other Details:
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Languages: eng Pagination: 6039-49 Citation Subset: - |
Affiliation:
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Department of Mechanical Engineering, University of Delaware, Newark, Delaware 19716, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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