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Jeong, Hu Young
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Edge-selenated graphene nanoplatelets as durable metal-free catalysts for iodine reduction reaction in dye-sensitized solar cells

Author(s)
Ju, Myung JongJeon, In-YupKim, Hong MoChoi, Ji IlJung, Sun-MinSeo, Jeong-MinChoi, In TaekKang, Sung HoKim, Han SeulNoh, Min JongLee, Jae-JoonJeong, Hu YoungKim, Hwan KyuKim, Yong-HoonBaek, Jong-Beom
Issued Date
2016-06
DOI
10.1126/sciadv.1501459
URI
https://scholarworks.unist.ac.kr/handle/201301/20242
Fulltext
http://advances.sciencemag.org/content/2/6/e1501459
Citation
SCIENCE ADVANCES, v.2, no.6, pp.e1501459
Abstract
Metal-free carbon-based electrocatalysts for dye-sensitized solar cells (DSSCs) are sufficiently active in Co(II)/Co(III) electrolytes but are not satisfactory in the most commonly used iodide/triiodide (I-/I-3(-)) electrolytes. Thus, developing active and stable metal-free electrocatalysts in both electrolytes is one of the most important issues in DSSC research. We report the synthesis of edge-selenated graphene nanoplatelets (SeGnPs) prepared by a simple mechanochemical reaction between graphite and selenium (Se) powders, and their application to the counter electrode (CE) for DSSCs in both I-/I-3(-) and Co(II)/Co(III) electrolytes. The edge-selective doping and the preservation of the pristine graphene basal plane in the SeGnPs were confirmed by various analytical techniques, including atomic-resolution transmission electron microscopy. Tested as the DSSC CE in both Co(bpy)(3)(2+/3+) (bpy = 2,2'-bipyridine) and I-/I-3(-) electrolytes, the SeGnP-CEs exhibited outstanding electrocatalytic performance with ultimately high stability. The SeGnP-CE-based DSSCs displayed a higher photovoltaic performance than did the Pt-CE-based DSSCs in both SM315 sensitizer with Co(bpy)(3)(2+/3+) and N719 sensitizer with I-/I-3(-) electrolytes. Furthermore, the I-3(-) reduction mechanism, which has not been fully understood in carbon-based CE materials to date, was clarified by an electrochemical kinetics study combined with density functional theory and nonequilibrium Green's function calculations.
Publisher
American Association for the Advancement of Science
ISSN
2375-2548
Keyword
FREE COUNTER ELECTRODESLOW-COSTFUNCTIONALIZED GRAPHENEPOROUS CARBONFREE CATHODESGRAPHITEPLATINUMTRANSPARENTPOLYANILINEDIFFUSION

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