Enhanced electrocatalytic activity of the Au-electrodeposited Pt nanoparticles-coated conducting oxide for the quantum dot-sensitized solar cells

Title
Enhanced electrocatalytic activity of the Au-electrodeposited Pt nanoparticles-coated conducting oxide for the quantum dot-sensitized solar cells
Author(s)
안광순윤영필김재홍Soon-Hyung Kang[Soon-Hyung Kang]Hyunsoo Kim[Hyunsoo Kim]Chel-Jong Choi[Chel-Jong Choi]Kyong-Kook Kim[Kyong-Kook Kim]
Keywords
COUNTER ELECTRODE; SURFACE; CDSE; EFFICIENCY; NANOTUBES; FILM
Issue Date
201408
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.105, no.8
Abstract
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 S-n(2-) + 2e(-) (CE) -> S-n-1(2-) + S2- at the CE/electrolyte interface, resulting in a significantly hindered recombination reaction, S-n(2-) + 2e(-) (TiO2 in the photoanode) -> S-n-1(2-) + S2-, and significantly improved overall energy conversion efficiency. (C) 2014 AIP Publishing LLC.
URI
http://hdl.handle.net/YU.REPOSITORY/31181http://dx.doi.org/10.1063/1.4893669
ISSN
0003-6951
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공과대학 > 화학공학부 > Articles
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