Photo(Electro)Chemical Oxidation of Water by the Persulfate Ion Over Aqueous Suspensions of Strontium Titanate SrTiO<sub>3</sub> Containing Lanthanum Chromite LaCrO<sub>3</sub>

Thewissen, D. H. M. W.; Timmer, K.; Eeuwhorst-Reinten, M.; Tinnemans, A. H. A.; Mackor, A.

doi:10.1002/ijch.198200033

Cited by 8 publications

(6 citation statements)

References 22 publications

(1 reference statement)

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“…177 Valence band holes oxidize sulfide to sulfur. 2 h + + S 2 --S (2) Subsequently, we found [3], and this has been confirmed [3], that in the presence of sulfite Reaction 2 is followed by Reaction 3.…”

supporting

confidence: 77%

Photoreduction of Thiosulfate in Semiconductor Dispersions

Borgarello

Desilvestro

Grätzel

et al. 1983

Helvetica Chimica Acta

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SummaryConduction band electrons produced by band gap excitation of Ti0,-particles reduce efficiently thiosulfate to sulfide and sulfite.2 e$ (Ti02)+ S20$----+ S2-+ SO:-This reaction is confirmed by electrochemical investigations with polycrystalline Ti02-electrodes. The valence band process in alkaline Ti02-dispersions involves oxidation of S20$-to tetrathionate which quantitatively dismutates into sulfite and thiosulfate, the net reaction being: 2h+(Ti02)+ 0.5 S 2 0 z -+ 1.5 H 2 0 ---+ SO=-+ 3 H+ This photodriven disproportionation of thiosulfate into sulfide and sulfite: hv 1.5 H2O+ 1.5 S203--2 SO:-+S2-+3 H + should be of great interest for systems that photochemically split hydrogen sulfide into hydrogen and sulfur.Introduction. -We have shown in a previous investigation [ 11 that illuminations of aqueous CdS/Ru02-suspensions by visible light leads to efficient cleavage of hydrogen sulfide into H2 and S. The mechanism involves band gap excitation of the CdS particle followed by reaction of conduction band electrons with water produce to H2.

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supporting

confidence: 77%

Photoreduction of Thiosulfate in Semiconductor Dispersions

Borgarello

Desilvestro

Grätzel

et al. 1983

Helvetica Chimica Acta

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“…On the contrary, if the recombination process is relatively slow, accumulatior~ of charge onto the surface will be possible, where this charge will then react with adsorbed species. A similar subbandgap effect has been previously repOrted to occur in SiC (14).…”

Section: Cbsupporting

confidence: 74%

“…Adsorption of sufide may cause poisoning of the catalytically active sites at the surface, or may even lead to chemical reactions with the material. In a previous paper on hydrogen formation from alkaline sulfide substrates over CdS powders, we have reported that addition of sulfite makes the process more efficient because in the anodic reaction thiosulfate is formed (15). In the present case, addition of sulfite has clearly a negative influence on the hydrogen evolution.…”

Section: Cbmentioning

confidence: 43%

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Photoelectrochemical Properties of α ‐ and β ‐ ZnP2 Electrodes and Powders

Thewissen¹,

Tinnemans²,

Zouwen-Assink³

et al. 1984

J. Electrochem. Soc.

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The basic photoelectrochemical behavior of tetragonal p‐type α‐ZnP2 has been investigated for the first time. The photoinduced current as a function of applied voltage and the spectral distribution of the photoresponse were measured in alkaline solutions (pH 13). Photosensitivity up to 580 nm in the visible range of the spectrum has been observed. From a linear Mott‐Schottky relation, an approximate value of the flatband potential false(VFB=−0.7±0.05 VSCEfalse) at pH 13 for monoclinic β‐ZnP2 has been determined. As a function of pH, VFB shows Nernstian behavior. For tetragonal α‐ZnP2 , VFB could not be determined. The onset of the cathodic photocurrent ( ≈−0.4 VSCE at pH 13) indicates, however, a somewhat more positive VFB for α‐ZnP2 . Upon illumination with visible light, hydrogen evolution from alkaline EDTA solutions containing ZnP2 powders loaded with a catalyst is very efficient. For α‐ZnP2 loaded with 0.5 weight percent of RuO2 , a formal quantum efficiency of 12% is found at 470 nm.

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“…[8] for The number concentration of particles Np can be calculated from the amount of precipitate, the apparent densities of the CdS panicles, and the number, volume mean diameter dv (Eq. [2 ]). The apparent densities were determined experimentally (Table I) or estimated by inter-or extrapolation of data found at different S but in the same type of precipitation medium.…”

Section: Crystallite Size Particle Size and Void Fractionmentioning

confidence: 99%