Catalytic and photocatalytic effects on photoplatinized macroscopic TiO2 photoanodes in dilute ethanol solutions

Houlihan, J.F.; Pollock, Ryan; Madacsi, D.P.

doi:10.1016/0013-4686(83)85048-8

Cited by 9 publications

(6 citation statements)

References 21 publications

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“…CH302 + 1/2 O2---> HCOOH + OH [16] represents a chemical oxidation as opposed to the electrochemical oxidation given in Eq. [7].…”

Section: Oh + Hcho ~ Ch~o2 [15]mentioning

confidence: 99%

“…The production of HCOOH from either Eq. [14] or [16] would result in higher ring currents according to Eq. [11].…”

Section: Oh + Hcho ~ Ch~o2 [15]mentioning

confidence: 99%

“…There are, of course, other products that could be written for Eq. [16] but it was put in this form to show that OH could act as a catalyst for Eq. [14].…”

Section: Oh + Hcho ~ Ch~o2 [15]mentioning

confidence: 99%

“…R ~ ---" R 2+ + ecb- [3] Thus, one photon results in two electrons in the conduction band. This phenomenon has been explored by many workers (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18). Reactions occurring in aqueous solution may also involve water oxidation.…”

mentioning

confidence: 99%

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Investigation of “Current Doubling” Mechanism of Organic Compounds by the Rotating Ring Disk Electrode Technique

Nogami

Kennedy

1989

J. Electrochem. Soc.

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The photo‐oxidation mechanisms of methanol, formaldehyde, and formic acid, which are potentially “current‐doubling agents,” were investigated using the RRDE technique. The disk electrode was normaln‐TiO2 and was illuminated by a xenon lamp while the ring electrode was Pt. Hydrogen ion, generated at the disk during the oxidation of water or the organic solute, was observed by its reduction near −1V vs.. SCE at the ring. Formic acid was also reduced to hydrogen at the ring electrode in this potential region. O2 , produced by H2O2 decomposition while in transit from the disk, was reduced at −0.4V vs. SCE at the ring. The experimental results are consistent with initial production of hydroxyl radicals by photogenerated holes, followed by oxidation of the organic solute. One pathway involves injection of an electron into the conduction band resulting in increased photocurrents. Although true current‐doubling (100% increase) was not observed, photocurrent increases of ∼50% were observed.

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“…CH302 + 1/2 O2---> HCOOH + OH [16] represents a chemical oxidation as opposed to the electrochemical oxidation given in Eq. [7].…”

Section: Oh + Hcho ~ Ch~o2 [15]mentioning

confidence: 99%

“…The production of HCOOH from either Eq. [14] or [16] would result in higher ring currents according to Eq. [11].…”

Section: Oh + Hcho ~ Ch~o2 [15]mentioning

confidence: 99%

“…There are, of course, other products that could be written for Eq. [16] but it was put in this form to show that OH could act as a catalyst for Eq. [14].…”

Section: Oh + Hcho ~ Ch~o2 [15]mentioning

confidence: 99%

mentioning

confidence: 99%

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Investigation of “Current Doubling” Mechanism of Organic Compounds by the Rotating Ring Disk Electrode Technique

Nogami

Kennedy

1989

J. Electrochem. Soc.

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“…Current-doubling effects are sometimes observed when organic compounds are photooxidized on semiconductor electrodes. − These effects are attributed to the simultaneous oxidation of the reaction intermediates, which occurs by the release of electrons into the conduction band. The oxidation intermediates of inorganic compounds also sometimes inject electrons, and a current-quadrupling effect is observed for the photocorrosion of Si electrodes in HF solutions. , …”

Section: Introductionmentioning

confidence: 99%

Vanishing of Current-Doubling Effect in Photooxidation of 2-Propanol on TiO₂ in Solutions Containing Fe(III) Ions

et al. 2000

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When organic compounds such as 2-propanol are in aqueous solutions and are photooxidized on the surface of semiconductor electrodes, the current quantum efficiency can reach close to 200% (current-doubling effect). However, we found that the current-doubling effect in the photooxidation of 2-propanol on TiO2 electrodes disappeared in solutions containing Fe(III) ions. From the analyses of the products, we found that acetone was produced in quantitative correlation to the photocurrent, and that practically no Fe(II) ions were generated in the solution. We also found that Fe(II) ions were not oxidized at a TiO2 photoanode in a solution containing Fe(III) ions, while they were oxidized in quantitative correlation to the photocurrent in the solution without Fe(III) ions. These results refuted the possibility that Fe(III) ions accepted electrons from the oxidation intermediates of 2-propanol. The plausible reason for the disappearance of the current-doubling effect is that 2-propanol is oxidized by two holes on the Fe(III)-adsorbed TiO2 surface.

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Dissolution of copper foil in aqueous solution ofpH=2

Sioda

1985

Monatsh Chem

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Catalytic and photocatalytic effects on photoplatinized macroscopic TiO2 photoanodes in dilute ethanol solutions

Cited by 9 publications

References 21 publications

Investigation of “Current Doubling” Mechanism of Organic Compounds by the Rotating Ring Disk Electrode Technique

Investigation of “Current Doubling” Mechanism of Organic Compounds by the Rotating Ring Disk Electrode Technique

Vanishing of Current-Doubling Effect in Photooxidation of 2-Propanol on TiO₂ in Solutions Containing Fe(III) Ions

Dissolution of copper foil in aqueous solution ofpH=2

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Catalytic and photocatalytic effects on photoplatinized macroscopic TiO2 photoanodes in dilute ethanol solutions

Cited by 9 publications

References 21 publications

Investigation of “Current Doubling” Mechanism of Organic Compounds by the Rotating Ring Disk Electrode Technique

Investigation of “Current Doubling” Mechanism of Organic Compounds by the Rotating Ring Disk Electrode Technique

Vanishing of Current-Doubling Effect in Photooxidation of 2-Propanol on TiO2 in Solutions Containing Fe(III) Ions

Dissolution of copper foil in aqueous solution ofpH=2

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Vanishing of Current-Doubling Effect in Photooxidation of 2-Propanol on TiO₂ in Solutions Containing Fe(III) Ions