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Compact and low los...
Compact and low loss electrochemical capacitors using a graphite / carbon nanotube hybrid material for miniaturized systems
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- Li, Qi, 1990 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Sun, S. (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Shanghai University,Fingerprint Cards
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- Smith, Anderson David, 1985 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Lundgren, Per, 1968 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Fu, Yifeng, 1984 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Su, Peng, 1983 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Xu, Tao (author)
- Southeast University
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- Ye, Lilei (author)
- SHT Smart High-Tech AB
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- Sun, Litao (author)
- Southeast University
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- Liu, Johan, 1960 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Shanghai University
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- Enoksson, Peter, 1957 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- Elsevier BV, 2019
- 2019
- English.
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In: Journal of Power Sources. - : Elsevier BV. - 0378-7753. ; 412, s. 374-383
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Abstract
Subject headings
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- With the establishment of the internet of things (IoT) and the rapid development of advanced microsystems, there is a growing demand to develop electrochemical capacitors (ECs) to replace bulky electrolytic capacitors on circuit boards for AC line filtering, and as a storage unit in energy autonomous systems. For this purpose, ECs must be capable of handling sufficiently high signal frequencies, display minimum energy loss through self-discharge and leakage current as well as maintaining an adequate capacitance. Here, we demonstrate ECs based on mechanically flexible, covalently bonded graphite/vertically aligned carbon nanotubes (graphite/VACNTs) hybrid materials. The ECs employing a KOH electrolyte exhibit a phase angle of −84.8°, an areal capacitance of 1.38 mF cm−2 and a volumetric capacitance (device level) of 345 mF cm−3 at 120 Hz, which is among the highest values for carbon based high frequency ECs. Additionally, the performance as a storage EC for miniaturized systems is evaluated. We demonstrate capacitive charging/discharging at μA current with a gel electrolyte, and sub-μA leakage current reached within 50 s, and 100 nA level equilibrium leakage within 100 s at 2.0 V floating with an ionic liquid electrolyte.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Annan teknik -- Övrig annan teknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies -- Other Engineering and Technologies not elsewhere specified (hsv//eng)
- NATURVETENSKAP -- Kemi -- Annan kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Keyword
- Energy storage
- Internet of things
- AC line filter
- Supercapacitors
- Hybrid material
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Li, Qi, 1990
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Sun, S.
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Smith, Anderson ...
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Lundgren, Per, 1 ...
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Fu, Yifeng, 1984
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Su, Peng, 1983
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show more...
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Xu, Tao
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Ye, Lilei
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Sun, Litao
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Liu, Johan, 1960
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Enoksson, Peter, ...
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show less...
- About the subject
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Other Engineerin ...
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and Other Engineerin ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Other Chemistry ...
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Electrical Engin ...
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and Other Electrical ...
- Articles in the publication
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Journal of Power ...
- By the university
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Chalmers University of Technology