Solution-processed graphene oxide electrode for supercapacitors fabricated using low temperature thermal reduction

Title
Solution-processed graphene oxide electrode for supercapacitors fabricated using low temperature thermal reduction
Authors
김승철윤가영길혜준유맑음박진우
Keywords
Reduced Graphene Oxide; supercapacitor; XPS; EDLC; Molecular dynamics
Issue Date
2020-11
Publisher
RSC advances
Citation
VOL 10, 22102
Abstract
We present a low temperature and solution-based fabrication process for reduced graphene oxide (rGO) electrodes for electric double layer capacitors (EDLCs). Through the heat treatment at 180 °C between the spin coatings of graphene oxide (GO) solution, an electrode with loosely stacked GO sheets could be obtained, and the GO base coating was partially reduced. The thickness of the electrodes could be freely controlled as these electrodes were prepared without an additive as a spacer. The GO coating layers were then fully reduced to rGO at a relatively low temperature of 300 °C under ambient atmospheric conditions, not in any chemically reducing environment. Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) results showed that the changes in oxygen functional groups of GO occurred through the heat treatments at 180 and 300 °C, which clearly confirmed the reduction from GO to rGO in the proposed fabrication process at the low thermal reduction temperatures. The structural changes before and after the thermal reduction of GO to rGO analyzed using Molecular Dynamic (MD) simulation showed the same trends as those characterized using Raman spectroscopy and XPS. An EDLC composed of the low temperature reduced rGO-based electrodes and poly(vinyl alcohol)/phosphoric acid (PVA/H3PO4) electrolyte gel was shown to have high specific capacitance of about 240 F g?1 together with excellent energy and power densities of about 33.3 W h kg?1 and 833.3 W kg?1, respectively. Furthermore, a series of multiple rGO-based EDLCs was shown to have fast charging and slow discharging properties that allowed them to light up a white light emitting diode (LED) for 30 min.
URI
http://pubs.kist.re.kr/handle/201004/72341
ISSN
2046-2069
Appears in Collections:
KIST Publication > Article
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