File Download

There are no files associated with this item.

  • Find it @ UNIST can give you direct access to the published full text of this article. (UNISTARs only)
Related Researcher

정후영

Jeong, Hu Young
UCRF Electron Microscopy group
Read More

Views & Downloads

Detailed Information

Cited time in webofscience Cited time in scopus
Metadata Downloads

Edge-selectively antimony-doped graphene nanoplatelets as an outstanding counter electrode with an unusual electrochemical stability for dye-sensitized solar cells employing cobalt electrolytes

Author(s)
Kim, Hong MoJeon, In-YupChoi, In TaekKang, Sung, HoShin Sun-HeeJeong, Hu YoungJu, Myung-JongBaek, Jong-BeomKim, Hwan Kyu
Issued Date
2016-06
DOI
10.1039/C6TA00789A
URI
https://scholarworks.unist.ac.kr/handle/201301/19811
Fulltext
http://pubs.rsc.org/en/content/articlelanding/2016/ta/c6ta00789a#!divAbstract
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.4, no.23, pp.9029 - 9037
Abstract
A dye-sensitized solar cell (DSSC), one of the present photovoltaic technologies, has always been associated with some problems that make them unsatisfactory for practical use. Among them, developing low-cost, durable, and highly active electrocatalysts such as platinum (Pt) alternatives is one of the urgent issues for practical and/or large-scale commercial applications. In this study, as one of the feasible Pt alternatives, edge-selectively antimony-doped graphene nanoplatelets (SbGnPs) were prepared by a simple eco-friendly mechanochemical reaction between pristine graphite and Sb powder for the use of a counter electrode (CE) in dye-sensitized solar cells, for the first time. The selective doping of metalloid Sb at the edges of graphene nanoplatelets (GnPs) and their structure were confirmed by various analytical techniques including atomic-resolution transmission electron microscopy (AR-TEM). The resultant SbGnPs exhibited a much lower charge-transfer resistance (Rct) compared to that of Pt as electrocatalysts toward a Co(bpy)32+/3+ (bpy = 2,2′-bipyridine) redox couple, displaying ‘zero loss stability’ of electrocatalytic activity for the Co(bpy)33+ reduction reaction even after 1000 potential cycles. DSSCs employing Co(bpy)32+/3+ were systematically evaluated in a comparison with the N-doped graphene nanoplatelet (NGnP) CE as a reference. The SbGnP-CE-based DSSC employing an SGT-021 sensitizer based on a D-π-A structured zinc(II)-porphyrin showed better power conversion efficiency (12.08%) than the Pt (11.26%) or the NGnPs (11.53%). The outstanding electrocatalytic activity of the SbGnPs with an unusual electrochemical stability suggests that they could be a possible candidate as the best alternative to a Pt-CE for DSSCs in conjunction with cobalt electrolytes.
Publisher
ROYAL SOC CHEMISTRYROYAL SOC CHEMISTRY
ISSN
2050-7488
Keyword
OXYGEN REDUCTION REACTIONMETAL-FREE ELECTROCATALYSTSLITHIUM ION BATTERIESENERGY-CONVERSIONFREE CATHODESPLATINUMRESISTANCECATALYSTFILMSOXIDE

qrcode

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.