Photocatalytic hydrogen production from solutions of sulfite using platinized cadmium sulfide powder

Matsumura, Michio; Saho, Yukinari; Tsubomura, Hiroshi

doi:10.1021/j100243a005

Cited by 207 publications

(94 citation statements)

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“…As a mean to achieve this goal, semiconductor photocatalysts have been extensively studied. In particular, a variety of visible light-active photocatalyts [2][3][4][5][6] including CdS [7][8][9][10][11][12][13] have been studied. In terms of the band gap magnitude and the position of band edges, CdS is ideally suited for photocatalytic water splitting but it is not effective at all unless suitable electron donors (EDs) are present.…”

Section: Introductionmentioning

confidence: 99%

Effects of the preparation method of the ternary CdS/TiO2/Pt hybrid photocatalysts on visible light-induced hydrogen production

2008

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A variety of combinations of CdS, TiO 2 , and Pt in preparing the hybrid catalysts were studied for hydrogen production under visible light (l > 420 nm) irradiation. The preparation method sensitively influenced the activity of the ternary hybrid catalysts. The formation of the potential gradient at the interface between CdS and TiO 2 is necessary in achieving the efficient charge separation and transfer and how the platinum as a cocatalyst is loaded onto the CdS/TiO 2 hybrid catalysts determines the overall hydrogen production efficiency. The common method of photoplatinization of CdS/TiO 2 hybrid [Pt-(CdS/TiO 2 )] was much less efficient than the present method in which Pt was photodeposited on bare TiO 2 , which was followed by the deposition of CdS [CdS/(Pt-TiO 2 )]. The CdS/(Pt-TiO 2 ) has the hydrogen production rate ranging (6-9) Â 10, which is higher by a factor of 3-30 than that of Pt-(CdS/TiO 2 ). The photocatalytic activity of the ternary hybrid catalysts was extremely sensitive to where the platinum is loaded. The photoactivity of the hybrid catalyst was also assessed in terms of the photocurrent collected by the methyl viologen electron shuttle in the catalyst suspension. CdS/(Pt-TiO 2 ) generated higher photocurrents than Pt-(CdS/TiO 2 ) by a factor of 2-7. The extreme sensitivity of the preparation method to the hydrogen production activity should be taken into account when hybrid photocatalysts are designed and prepared.

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Section: Introductionmentioning

confidence: 99%

Effects of the preparation method of the ternary CdS/TiO2/Pt hybrid photocatalysts on visible light-induced hydrogen production

2008

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“…The results show that the highest H 2 evolution rate was obtained when Na 2 S/Na 2 SO 3 was used as sacrificial reagent. The enhancement of H 2 evolution rate was attributed to improved S oxidation rate assisted by the sacrificial reagents [7].…”

Section: Resultsmentioning

confidence: 98%

Surface modification-a novel way of attaching cocatalysts on CdS semiconductors for photocatalytic hydrogen evolution

Isimjan

Lin

et al. 2014

IOP Conf. Ser.: Mater. Sci. Eng.

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“…10,[15][16][17] Other factors such as the chemical nature and the redox potential of surfactants and sacrificial hole scavengers, and solution pH are relevant factors determining rates of H 2 evolution. [18][19][20] In this letter, we report enhanced hydrogen generation rates over a colloidal CdS-Pt system at high pH. We compare the hydrogen production at four different pH values ranging from 11 to 14, and show a large increase in the hydrogen generation rates at pH higher than 13.…”

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confidence: 76%

Enhanced hydrogen evolution rates at high pH with a colloidal cadmium sulphide–platinum hybrid system

et al. 2014

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We demonstrate enhanced hydrogen generation rates at high pH using colloidal cadmium sulphide nanorods decorated with Pt nanoparticles. We introduce a simplified procedure for the decoration and subsequent hydrogen generation, reducing both the number of working steps and the materials costs. Different Pt precursor concentrations were tested to reveal the optimal conditions for the efficient hydrogen evolution. A sharp increase in hydrogen evolution rates was measured at pH 13 and above, a condition at which the surface charge transfer was efficiently mediated by the formation of hydroxyl radicals and further consumption by the sacrificial triethanolamine hole scavenger.

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Photocatalytic hydrogen production from solutions of sulfite using platinized cadmium sulfide powder

Abstract: Platinized cadmium sulfide powder suspended in a solution of sodium sulfite produces hydrogen efficiently by visible light. Sulfite ions are oxidized to sulfate and dithionate ions.

Cited by 207 publications

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Effects of the preparation method of the ternary CdS/TiO2/Pt hybrid photocatalysts on visible light-induced hydrogen production

Effects of the preparation method of the ternary CdS/TiO2/Pt hybrid photocatalysts on visible light-induced hydrogen production

Surface modification-a novel way of attaching cocatalysts on CdS semiconductors for photocatalytic hydrogen evolution

Enhanced hydrogen evolution rates at high pH with a colloidal cadmium sulphide–platinum hybrid system

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