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Shin, Hyung-Joon
Nanoscale Materials Science Lab (NMSL)
Research Interests
  • Scanning tunneling microscopy, surface science, interface science, nanomaterials

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A high-performance supercapacitor based on polyaniline-nanoporous gold

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Title
A high-performance supercapacitor based on polyaniline-nanoporous gold
Author
Lee, Keon-UByon, Ji YoungShin, Hyung-JoonKim, Sang Hoon
Keywords
Nanoporous goldSupercapacitorPolyanilinePerchloric acid
Issue Date
201903
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.779, no., pp.74 - 80
Abstract
We prepared and investigated the performance of a supercapacitor prepared by coating polyaniline(PANI) layer on nanoporous gold(NPG) support. NPG was prepared by dealloying Au-Mg alloys with diluted acetic acid that was a simple and environmentally benign process. PANI was electro-deposited on NPG by chrono-potentiometry in perchloric acid. By optimizing the electro-polymerization process, we could prepare uniform and compact PANI layers with 5–10 nm thickness in and out of the whole NPG surface. We also improved the stability of PANI by using smaller dopant anions for electro-polymerization. Our PANI/NPG supercapacitors had a large areal capacitance of 6.54 mF/cm2, maximum energy density of 9.11 mWh/cm2 at power density of 1.56 W/cm2, fast charge/discharge rates up to 100 mV/s, and better stability than PANI/NPG supercapacitors prepared by sulfuric acid.
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DOI
10.1016/j.jallcom.2018.11.022
ISSN
0925-8388
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