Photoelectrocatalytic reduction of carbon dioxide in aqueous suspensions of semiconductor powders

Inoue, Tooru; Fujishima, Akira; Konishi, Satoshi; Honda, Kenichi

doi:10.1038/277637a0

Cited by 2,682 publications

(1,667 citation statements)

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“…Inoue et al subsequently examined the photoelectrocatalyic reduction of CO 2 in aqueous suspensions of semiconductor powders. 29 Six semiconductors were evaluated and HCOOH, HCHO, and CH 3 OH were the main organic products observed. Henglein achieved an impressive quantum efficiency of 80% for the photocatalytic reduction of CO 2 to HCOOH by ZnS colloids, with the concomitant oxidation of sulfite to sulfate.…”

Section: Semiconductor Photocatalytic Activation and Fixation Of Comentioning

confidence: 99%

Artificial photosynthesis: semiconductor photocatalytic fixation of CO2 to afford higher organic compounds

2011

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Section: Semiconductor Photocatalytic Activation and Fixation Of Comentioning

confidence: 99%

Artificial photosynthesis: semiconductor photocatalytic fixation of CO2 to afford higher organic compounds

2011

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“…1,2 Bandgap excitation by UV light led to the formation of methane and methanol as products. Most semiconductor studies were conducted with aqueous suspensions of colloidal particles of TiO 2 , ZnS, ZnSe, CdSe, etc., often surface-modified to enhance efficiency, selectivity, or wavelength response.…”

Section: Introductionmentioning

confidence: 99%

“…Most semiconductor studies were conducted with aqueous suspensions of colloidal particles of TiO 2 , ZnS, ZnSe, CdSe, etc., often surface-modified to enhance efficiency, selectivity, or wavelength response. 3,4 Reduction is initiated by transfer of photogenerated conduction band electrons to surface-adsorbed CO 2 or carbonate. Excitation wavelengths are limited to the UV region for those materials that are stable under use (metal oxides).…”

Section: Introductionmentioning

confidence: 99%

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CO₂ Splitting by H₂O to CO and O₂ under UV Light in TiMCM-41 Silicate Sieve

2004

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The 266 nm light-induced reaction of CO 2 and H 2 O gas mixtures (including isotopic modifications 13 CO 2 , C 18 O 2 , and D 2 O) in framework TiMCM-41 silicate sieve was monitored by in-situ FT-IR spectroscopy at room temperature. Carbon monoxide gas was observed as the sole product by infrared, and the growth was found to depend linearly on the photolysis laser power. H 2 O was confirmed as stoichiometric electron donor. The work establishes CO as the single photon, 2-electron transfer product of CO 2 photoreduction by H 2 O at framework Ti centers for the first time. O 2 was detected as co-product by mass spectrometric analysis of the photolysis gas mixture. These results are explained by single UV photon-induced splitting of CO 2 by H 2 O to CO and surface OH radical.

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“…Semiconductor photocatalytic reactions, such as water splitting, [1][2][3][4][5][6][7][8] dehydrogenation of alcohols, 9-13 mineralization of organic compounds in water, [14][15][16][17] organic syntheses, [18][19][20][21][22] and reductive fixation of carbon dioxide, [23][24][25][26][27][28][29] are of great importance for both fundamental studies and practical applications. Among the various semiconductor photocatalysts, titanium(IV) oxide (TiO 2 ) is one of the most popular and promising materials because it is stable in various solvents under photoirradiation, it is available commercially, and it can induce various types of redox reactions.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Some Physical Properties of Titanium Dioxide Particles and Their Photocatalytic Activity for Some Probe Reactions in Aqueous Systems

et al. 2002

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Nanocrystalline anatase titanium(IV) oxide (TiO 2 ) particles were synthesized by hydrothermal crystallization in organic media (HyCOM) followed by calcination at various temperatures up to 1273 K, and they were characterized by analysis of surface adsorption of the substrates, as well as by X-ray diffraction (XRD) and Brunauer-Emmet-Teller (BET) surface area measurements. These HyCOM TiO 2 samples were used for three kinds of photocatalytic reactions: mineralization of acetic acid (AcOH) in aerated aqueous suspensions, dehydrogenation of 2-propanol (2-PrOH) by in situ platinized powders, and silver-metal deposition from silver ions (Ag + ) in deaerated aqueous suspensions of bare TiO 2 samples. Dependence of the photocatalytic activities on calcination temperature (T c ) and on the amount of adsorbed substrates in each reaction and correlations with the physical properties of HyCOM TiO 2 were examined. In the case of mineralization of AcOH, the activitiy of each sample was almost proportional to the amount of surface-adsorbed AcOH in the dark, and the uncalcined (as-prepared) HyCOM TiO 2 showed the highest activity, which was monotonically reduced with T c , that is, with decrease in the amount of surface-adsorbed AcOH. On the other hand, in the case of silver-metal deposition, the photocatalytic activity was enhanced by calcination at higher temperature, despite the simultaneous decrease in the amount of surface-adsorbed Ag + in the dark. Overall, the effects of calcination on the photocatalytic activities for several reaction systems strongly suggested that photocatalytic activity depends on two significant factors, adsorbability and recombination probability, corresponding to the specific surface area and crystallinity, respectively, and that the balance of these two factors determines the T c dependence.

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Photoelectrocatalytic reduction of carbon dioxide in aqueous suspensions of semiconductor powders

Cited by 2,682 publications

References 11 publications

Artificial photosynthesis: semiconductor photocatalytic fixation of CO2 to afford higher organic compounds

Artificial photosynthesis: semiconductor photocatalytic fixation of CO2 to afford higher organic compounds

CO₂ Splitting by H₂O to CO and O₂ under UV Light in TiMCM-41 Silicate Sieve

Correlation between Some Physical Properties of Titanium Dioxide Particles and Their Photocatalytic Activity for Some Probe Reactions in Aqueous Systems

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Photoelectrocatalytic reduction of carbon dioxide in aqueous suspensions of semiconductor powders

Cited by 2,682 publications

References 11 publications

Artificial photosynthesis: semiconductor photocatalytic fixation of CO2 to afford higher organic compounds

Artificial photosynthesis: semiconductor photocatalytic fixation of CO2 to afford higher organic compounds

CO2 Splitting by H2O to CO and O2 under UV Light in TiMCM-41 Silicate Sieve

Correlation between Some Physical Properties of Titanium Dioxide Particles and Their Photocatalytic Activity for Some Probe Reactions in Aqueous Systems

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CO₂ Splitting by H₂O to CO and O₂ under UV Light in TiMCM-41 Silicate Sieve