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Effect of HNO3 functionalization on large scale graphene for enhanced tri-iodide reduction in dye-sensitized solar cells

Title
Effect of HNO3 functionalization on large scale graphene for enhanced tri-iodide reduction in dye-sensitized solar cells
Author
강용수
Keywords
FEW-LAYER GRAPHENE; GRAPHITE-INTERCALATION COMPOUNDS; CHEMICAL-VAPOR-DEPOSITION; RAMAN-SPECTROSCOPY; CARBON NANOTUBES; ELECTRONIC-PROPERTIES; FILMS; TRANSPARENT; OXIDE; TRANSISTORS
Issue Date
2012-10
Publisher
Royal Society of Chemistry
Citation
JOURNAL OF MATERIALS CHEMISTRY, 2012, 22(38), p20490-p20497, 8p.
Abstract
Improving the electro-catalytic activity of graphene has recently been the subject of intense research for high efficiency flexible energy storage and conversion devices. We report the synthesis of a large scale graphene film by a CVD method and its electro-catalytic activity by functionalization with HNO3 for a high efficiency electrochemical electrode in DSSCs. We found that HNO3 functionalization on graphene enhances the tri-iodide reduction rate by three times in a dye sensitized solar cell compared to that of pristine graphene. The X-ray photoelectron spectroscopy (XPS) and ultra-violet photoemission spectroscopy (UPS) studies confirm the covalently attached C-OH, C(O)OH and NO3- moieties to carbon atoms through sp(2)-sp(3) hybridization, and this results in the Fermi level shift towards p-type doping. We believe that the covalently attached functional groups cause the enrichment of the electrocatalytically active sites along with facilitating the charge transfer kinetics from graphene counter electrodes to redox couples. The enhanced catalytic effect of functionalized graphene offers insights into new types of electrode development opportunities in graphene based energy storage and conversion devices.
URI
http://pubs.rsc.org/en/content/articlelanding/2012/jm/c2jm32481d/unauth#!divAbstracthttp://repository.hanyang.ac.kr/handle/20.500.11754/69412
ISSN
0959-9428
DOI
10.1039/C2JM32481D
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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