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TiN Nanoparticles on CNT-Graphene Hybrid Support as Noble-Metal-Free Counter Electrode for Quantum-Dot-Sensitized Solar Cells

Title
TiN Nanoparticles on CNT-Graphene Hybrid Support as Noble-Metal-Free Counter Electrode for Quantum-Dot-Sensitized Solar Cells
Authors
Youn, DHSeol, MKim, JYJang, JWChoi, YYong, KLee, JS
POSTECH Authors
Yong, K
Date Issued
2013-02
Publisher
WILEY-V C H VERLAG GMBH
Abstract
The development of an efficient noble-metal-free counter electrode is crucial for possible applications of quantum-dot-sensitized solar cells (QDSSCs). Herein, we present TiN nanoparticles on a carbon nanotube (CNT)-graphene hybrid support as a noble-metal-free counter electrode for QDSSCs employing a polysulfide electrolyte. The resulting TiN/CNT-graphene possesses an extremely high surface roughness, a good metal-support interaction, and less aggregation relative to unsupported TiN
it also has superior solar power conversion efficiency (4.13%) when applying a metal mask, which is much higher than that of the state-of-the-art Au electrode (3.35%). Based on electrochemical impedance spectroscopy measurements, the enhancement is ascribed to a synergistic effect between TiN nanoparticles and the CNT-graphene hybrid, the roles of which are to provide active sites for the reduction of polysulfide ions and electron pathways to TiN nanoparticles, respectively. The combination of graphene and CNTs leads to a favorable morphology that prevents stacking of graphene or bundling of CNTs, which maximizes the contact of the support with TiN nanoparticles and improves electron-transfer capability relative to either carbon material alone.
Keywords
electron microscopy; nanoparticles; nanotubes; quantum dots; titanium nitride; HIGHLY EFFICIENT; TITANIUM NITRIDE; CARBON; FILMS; OXIDE; CDS; NANOCRYSTALS; REDUCTION; PBS
URI
https://oasis.postech.ac.kr/handle/2014.oak/13959
DOI
10.1002/CSSC.201200775
ISSN
1864-5631
Article Type
Article
Citation
CHEMSUSCHEM, vol. 6, no. 2, page. 261 - 267, 2013-02
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용기중YONG, KIJUNG
Dept. of Chemical Enginrg
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