Au was electrodeposited potentiostatically at 0.3 V for 5 min on nanoporous Pt nanoparticle-coated F-doped SnO2 (FTO/Pt) substrates. For comparison, Au-electrodeposited FTO (FTO/Au) and Au-uncoated FTO/Pt were prepared. FTO/Au showed large-sized Au clusters dispersed sparsely over FTO, which resulted in lower electrocatalytic activity than FTO/Pt. In contrast, FTO/Pt exhibited poor stability unlike FTO/Au due to poisoning by the adsorption of sulfur species. The Au-electrodeposited FTO/Pt (FTO/Pt/Au) consisted of small Au clusters deposited over the entire area of Pt due to the effective Au nucleation provided by nanoporous metallic Pt. FTO/Pt/Au exhibited enhanced electrocatalytic activity and excellent stability because the small Au particles well-dispersed over the nanoporous metallic Pt network provided numerous electrochemical reaction sites, and the Pt surface was not exposed to the electrolyte. When FTO/Pt/Au was used as the counter electrode (CE) of a quantum dot-sensitized solar cell, the significantly enhanced electrocatalytic activity of the FTO/Pt/Au CE facilitated the reduction reaction of Sn2− + 2e− (CE) → Sn−12− + S2− at the CE/electrolyte interface, resulting in a significantly hindered recombination reaction, Sn2− + 2e− (TiO2 in the photoanode) → Sn-12− + S2−, and significantly improved overall energy conversion efficiency.
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25 August 2014
Research Article|
August 28 2014
Enhanced electrocatalytic activity of the Au-electrodeposited Pt nanoparticles-coated conducting oxide for the quantum dot-sensitized solar cells
Yeung-Pil Yoon;
Yeung-Pil Yoon
1School of Chemical Engineering,
Yeungnam University
, Gyeongsan 712-749, South Korea
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Jae-Hong Kim;
Jae-Hong Kim
1School of Chemical Engineering,
Yeungnam University
, Gyeongsan 712-749, South Korea
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Soon-Hyung Kang;
Soon-Hyung Kang
2Department of Chemistry Education,
Chonnam National University
, Gwangju 500-757, South Korea
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Hyunsoo Kim;
Hyunsoo Kim
3School of Semiconductor and Chemical Engineering,
Chonbuk National University
, Jeonju 561-756, South Korea
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Chel-Jong Choi;
Chel-Jong Choi
3School of Semiconductor and Chemical Engineering,
Chonbuk National University
, Jeonju 561-756, South Korea
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Kyong-Kook Kim;
Kyong-Kook Kim
a)
4Department of Nano-Optical Engineering,
Korea Polytechnic University
, Siheung 429-793, South Korea
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Kwang-Soon Ahn
Kwang-Soon Ahn
b)
1School of Chemical Engineering,
Yeungnam University
, Gyeongsan 712-749, South Korea
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a)
Email: [email protected].
b)
Email: [email protected]. Tel.: +82-53-810-2524. Fax: +82-53-810-4631.
Appl. Phys. Lett. 105, 083116 (2014)
Article history
Received:
July 10 2014
Accepted:
August 09 2014
Citation
Yeung-Pil Yoon, Jae-Hong Kim, Soon-Hyung Kang, Hyunsoo Kim, Chel-Jong Choi, Kyong-Kook Kim, Kwang-Soon Ahn; Enhanced electrocatalytic activity of the Au-electrodeposited Pt nanoparticles-coated conducting oxide for the quantum dot-sensitized solar cells. Appl. Phys. Lett. 25 August 2014; 105 (8): 083116. https://doi.org/10.1063/1.4893669
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