Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 4, Issue 1, Pages 189-194Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz301881d
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Funding
- KOSEF NRL program [R0A-2008-000-20068-0]
- KOSEF EPB center [R11-2008-052-02002]
- Global Frontier R&D Program on Center for Multiscale Energy System [2011-0031571]
- KCAP (Sogang Univ.)
- MEST through NRF [NRF-2011-C1AAA001-2011-0030278]
- Grants-in-Aid for Scientific Research [23655009, 22245022] Funding Source: KAKEN
- National Research Foundation of Korea [R0A-2008-000-20068-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The interparticle charge transfer within the agglomerates of TiO2 nanoparticles in slurries markedly enhanced the dye-sensitized production of H-2 under visible light. By purposely decoupling the light absorbing part of Dye/TiO2 from the active catalytic center of Pt/TiO2, the role of bare TiO2 nanoparticles working as a mediator that connects the above two parts in the agglomerates was investigated systematically. The presence of mediator in the agglomerate facilitated the charge separation and the electron transfer from Dye/TiO2 to Pt/TiO2 through multiple grain boundaries and subsequently produced more hydrogen. The dye-sensitized reduction of Cr(VI) to Cr(III) was also enhanced when Dye/TiO2 nanoparticles were agglomerated with bare TiO2 nanoparticles. The charge recombination between the oxidized dye and the injected electron was retarded in the presence of bare TiO2 nanoparticles, and this retarded recombination on Dye/TiO2 was confirmed by using transient laser spectroscopy. This phenomenon can be rationalized in terms of an interparticle Fermi level gradient within the agglomerates, which drives the charge separation.
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