ChemInform Abstract: Visible Light Water Splitting Using Dye-Sensitized Oxide Semiconductors

Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Accounts of Chemical Research (Impact Factor: 22.32). 11/2009; 42(12):1966-73. DOI: 10.1021/ar9002398
Source: PubMed


Researchers are intensively investigating photochemical water splitting as a means of converting solar to chemical energy in the form of fuels. Hydrogen is a key solar fuel because it can be used directly in combustion engines or fuel cells, or combined catalytically with CO2 to make carbon containing fuels. Different approaches to solar water splitting include semiconductor particles as photocatalysts and photoelectrodes, molecular donor-acceptor systems linked to catalysts for hydrogen and oxygen evolution, and photovoltaic cells coupled directly or indirectly to electrocatalysts.

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    • "Photosensitization of TiO 2 by dyes is another promising method to shift its optical response from the ultraviolet to the visible light region, which has been widely used in dye-sensitized solar cells [15] [16] [17] [18]. Recently, some studies have focused on the further expansion of ruthenium bipyridyl complexes sensitized TiO 2 for visiblelight-induced hydrogen production with Pt nanopaticles as the cocatalyst [19] [20] [21] [22] [23]. However, these systems were limited by the expensive cost of noble metals, and it is necessary to develop noble-metal-free dye-sensitized hydrogen evolution systems based on earth-abundant transition metals. "
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    ABSTRACT: Titanium dioxide is an excellent photocatalyst for photocatalytic hydrogen production but its application is limited by its poor visible light harvesting capability. In this work, a visible-light-responsive photocatalytic hydrogen production system was developed using Zn(II)-5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin (ZnTCPP) sensitized MoS2/TiO2 (ZnTCPP-MoS2/TiO2) as photocatalysts. The as-prepared composite photocatalysts have apparent adsorption in visible light region, making them active for visible-light-induced hydrogen evolution. Even without noble metals, ZnTCPP-MoS2/TiO2 photocatalyst loaded with 1.00 wt% MoS2 shows the highest H2 production rate of 10.2 μmol h−1, and the turnover number (TON) with respect to ZnTCPP dye reaches 261 after visible light irradiation for 12 h. The highest H2 production rate of ZnTCPP-MoS2/TiO2 is much higher than that of ZnTCPP-Pt/TiO2, suggesting that MoS2 can act as a more effective cocatalyst than the commonly used platinum. This study presents a noble-metal-free and visible-light-responsive TiO2-based photocatalyst for solar-to-hydrogen conversion.
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    • "The latter makes TiO 2 without visible light (í µí¼† > 400 nm) activity, resulting in a poor solar energy utilization. As a consequence, intense research activities have been devoted to the development of visible light active TiO 2 with high photocatalytic efficiency, such as surface photosensitization, element doping, semiconductor combination, and structural control [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28]. "
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    ABSTRACT: Two-dimensional TiO2 nanosheet films with visible light trapping nanostructures were successfully fabricated by alkali hydrothermal reaction using Ti sheet as precursor. Metallic Au nanoparticles (NPs) were then deposited on the surface of TiO2 film through a microwave-assisted reduction process. The investigations reveal that the localized surface plasmon resonance (LSPR) of Au NPs is greatly enhanced by the overlapped light harvesting nanostructures between TiO2 film and Au NPs, resulting in an enhanced LSPR-absorption with two peaks at 389 nm and 540 nm. The photocatalytic performance of the samples was evaluated by degradation of methylene blue (MB) as a model pollutant. The experimental results indicate that the photocatalytic performance of TiO2 is greatly promoted by a synergetic effect between the overlapped light harvesting nanostructures and the improved charge carrier separation processes. The MB degradation over the optimal sample is much faster than that of pure TiO2 film by a factor of 3.0 and 5.7 under UV light and UV + visible light irradiation, respectively. This study provides a simple strategy to develop film-shaped plasmonic photocatalysts with high efficiency.
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    • "). The most widely used dyes were metal complexes (Youngblood et al. 2009). Maruthamuthu et al. achieved overall water splitting for H 2 and O 2 production simultaneously using [Ru(dcbyp) 2 (dpq )] 2? -sensitized Pt/TiO 2 (Dhanalakshmi et al. 2001). "
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