Stoichiometric photocatalytic decomposition of pure water in Pt/TiO2 aqueous suspension system

Tabata, Soichi; Nishida, Hisataka; Masaki, Yasuhiro; Tabata, Kenji

doi:10.1007/bf00808339

Cited by 142 publications

(65 citation statements)

References 8 publications

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“…This limited photoactivity is in sharp contrast with the results obtained with TiO 2 for water splitting, which even in the absence of sacrificial agent shows a rate of hydrogen production of 373 μmol/g h [32]. Furthermore, under sunlight irradiation, the CO 2 conversion to CO is not higher than 3 μmol/g h [7].…”

Section: Artificial Photosynthesis For Co 2 Reductioncontrasting

confidence: 63%

Current Challenges of CO2 Photocatalytic Reduction Over Semiconductors Using Sunlight

O’Shea

Serrano

Coronado

2015

From Molecules to Materials

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The possibility of producing fuels and chemicals from CO 2 using semiconductors and sunlight holds the promise of storing abundant, despite diluted, solar power in the form of energy-rich chemicals. In principle, this process can operate under very soft conditions, and this may facilitate a distributed production of solar fuels. However, photocatalytic reduction of CO 2 over semiconductors has proved to be a very challenging process, and the yields currently attained are rather limited. Accordingly, a number of drawbacks should be overcome if this process is expected to become a feasible alternative for generation of sustainable fuels and chemicals in the midterm. First, the conversion rate of CO 2 should be boosted to reach values in the order of millimoles per hour and gram of semiconductor. In addition, several relevant engineering challenges should be conveniently solved before this technology becomes viable. In this chapter, we evaluate thoroughly the most recent advances on the understanding of this photocatalytic process, and at the same time, we try to define the most relevant aspects that scientific research should address in the near future.

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Section: Artificial Photosynthesis For Co 2 Reductioncontrasting

confidence: 63%

Current Challenges of CO2 Photocatalytic Reduction Over Semiconductors Using Sunlight

O’Shea

Serrano

Coronado

2015

From Molecules to Materials

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“…The physical properties of HyCOM TiO 2 powders, for example, surface area, particle size, and adsorbability of substrates, can be controlled over a wide range by changing the postcalcination temperature (T c ) up to 1273 K. The effects of calcination on the photocatalytic activities for several photocatalytic reactions were studied, and it was found that the CH 3 CH(OH)CH 3 ) CH 3 COCH 3 + H 2 (4) …”

Section: Discussionmentioning

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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“…In the past decade, some researchers have succeeded in overcoming the problem of photocatalytic overall water splitting on Pt-loaded photocatalysts by improving reaction conditions and photocatalysts [17][18][19]. Sato et al showed in their pioneering work on Pt-loaded photocatalytic systems that Pt-loaded TiO 2 (Pt-TiO 2 ) coated with NaOH could decompose water vapor [17].…”

Section: Introductionmentioning

confidence: 99%

“…an aqueous Pt-TiO 2 suspension was irradiated from the top of a reaction cell but not from the bottom or side of the cell [18]. They claimed that the further the photoirradiated particles are from the water level, the faster is the backward reaction of H 2 and O 2 suppressing the overall rate, and top-irradiation reduces the distance, resulting in higher efficiency.…”

Section: Introductionmentioning

confidence: 99%

Preparation of platinized strontium titanate covered with hollow silica and its activity for overall water splitting in a novel phase-boundary photocatalytic system

et al. 2006

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Platinum-loaded strontium titanate (Pt-SrTiO 3 ) (core) -silica (shell) powder was prepared by double-layer winding of a carbon and a silica layer on Pt-SrTiO 3 followed by heat treatment to remove the carbon layer. Scanning electron microscope (SEM) observation and analyses of the BET surface area suggested that the powder has a void space between Pt-SrTiO 3 (core) and silica (shell). When the surface of the powder was partially modified with a fluoroalkylsilylation agent, thus-obtained material assembled at a gas-water interface and acted as a photocatalyst for overall water splitting to produce hydrogen (H 2 ) and oxygen (O 2 ). Probably due to the suppression of a backward reaction, production of water from H 2 and O 2 , on the platinum, the overall efficiency of this system was higher than that of the conventional suspension system. Moreover, while the Pt-SrTiO 3 powders directly covered with fluoroalkylethylsilyl groups showed low photostability, i.e., prolonged irradiation precipitated some of the surface-modified particles in water owing to photocatalytic decomposition of surface fluoroalkylethylsilyl groups, this material could retain its location at the phase boundary.

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Stoichiometric photocatalytic decomposition of pure water in Pt/TiO2 aqueous suspension system

Cited by 142 publications

References 8 publications

Current Challenges of CO2 Photocatalytic Reduction Over Semiconductors Using Sunlight

Current Challenges of CO2 Photocatalytic Reduction Over Semiconductors Using Sunlight

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

Preparation of platinized strontium titanate covered with hollow silica and its activity for overall water splitting in a novel phase-boundary photocatalytic system

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