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Baek, Jong-Beom
Center for Dimension-Controllable Organic Frameworks
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Metalloid tellurium-doped graphene nanoplatelets as ultimately stable electrocatalysts for cobalt reduction reaction in dye-sensitized solar cells

Author(s)
Jeon, In-YupKim, Hong MoKweon, Do HyungJung, Sun-MinSeo, Jeong-MinShin, Sun-HeeChoi, In TaekEom, Yu KyungKang, Sung HoKim, Hwan KyuJu, Myung-JongBaek, Jong-Beom
Issued Date
2016-12
DOI
10.1016/j.nanoen.2016.09.001
URI
https://scholarworks.unist.ac.kr/handle/201301/21056
Fulltext
http://www.sciencedirect.com/science/article/pii/S2211285516303652
Citation
NANO ENERGY, v.30, pp.867 - 876
Abstract
One feasible alternative to Pt catalyst in dye-sensitized solar cells (DSSCs) is metalloid tellurium (Te)-doped graphene nanoplatelets (TeGnPs). These were prepared by ball-milling graphite in the presence of Te crystals. Introduction of Te at the edges of TeGnPs was confirmed with various analytical techniques including time of flight secondary ion mass spectrometry (TOF-SIMS). The resultant TeGnPs are herein evaluated as counter electrode (CE) materials for the cobalt reduction reaction (CRR) in DSSCs. TeGnP-CE exhibits much lower charge transfer resistance (R ct=0.15Ωcm2) than that (R ct=1.77Ωcm2) of Pt-CE. More importantly, TeGnP-CE displays an extreme electrochemical stability for the Co(bpy)3 2+/3+ (bpy=2,2'-bipyridine) redox couple even after 1000 potential cycles. The SM315-based DSSC fabricated with TeGnP-CE shows a better power conversion efficiency (PCE=11.58%) than that with Pt-CE (11.03%), suggesting that TeGnP-CE could be one of the best alternatives to Pt-CE in DSSCs.
Publisher
Elsevier BV
ISSN
2211-2855
Keyword (Author)
Tellurium (Te)-doped graphene nanoplateletsBall-millingElectrocatalystsCobalt reduction reactionCharge-transfer resistanceDye-sensitized solar cells
Keyword
FREE COUNTER ELECTRODESFUNCTIONALIZED GRAPHENEFREE CATHODESLOW-COSTCARBONPLATINUMCONVERSIONSUPERIORARRAYSEDGES

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