Mechanism of cathodic processes on the semiconductor zinc oxide

Freund, Thomas; Morrison, Steven

doi:10.1016/0039-6028(68)90167-2

Cited by 45 publications

(29 citation statements)

References 6 publications

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“…4(a)), and an input laser power of 300 μW. The results obtained confirmed that the flat band of all the ZnO electrodes occurred at approximately −0.7 V (vs. Ag/AgCl); this corresponds to the reported values of −0.7 to −0.9 V (vs. Ag/AgCl)1819. Since a stable photocurrent was obtained at an electrode potential of 0.5 V (vs. Ag/AgCl) under low incident-light power, we set the electrode potential to 0.5 V (vs. Ag/AgCl) during the experiment to determine the dependence of the photocurrent on the incident-light power.…”

Section: Resultssupporting

confidence: 81%

Dressed-photon–phonon (DPP)-assisted visible- and infrared-light water splitting

Yatsui

Imoto

Mochizuki

et al. 2014

Sci Rep

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A dressed-phonon–phonon (DPP) assisted photocatalyst reaction was carried out to increase the visible light responsibility, where the photon energy of the radiation, which ranged from visible to infrared light is less than band gap energy of the photocatalyst (ZnO, 3.3 eV). The dependence of the photocurrent on excitation power indicated that two-step excitation occurred in DPP-assisted process. A cathodoluminescence measurement also supported the conclusion that the visible- and infrared-light excitation originated from DPP excitation, not from defect states in the ZnO nanorod photocatalyst.

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Section: Resultssupporting

confidence: 81%

Dressed-photon–phonon (DPP)-assisted visible- and infrared-light water splitting

Yatsui

Imoto

Mochizuki

et al. 2014

Sci Rep

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“…Relationship [7] seems to be more generally applicable than the more restrictive relationship [8]. In contrast to methanol and ethanol, the following substances obey [7] but not [8]: 2-propanol, tartrate ion, and borohydride ion.…”

Section: August 1968mentioning

confidence: 99%

“…In contrast to methanol and ethanol, the following substances obey [7] but not [8]: 2-propanol, tartrate ion, and borohydride ion. The nonconstancy of ~ is shown in Table I.…”

Section: August 1968mentioning

confidence: 99%

Chemical Reactions Involving Holes at the Zinc Oxide Single Crystal Anode

Gomes¹,

Freund²,

Morrison³

1968

J. Electrochem. Soc.

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141

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The anodic oxidation of various reactants dissolved in water was studied on a zinc oxide single‐crystal electrode by electrical techniques. It was found that only a few substances inject electrons into the conduction band. However, many reactants are oxidized by holes, which are created in the crystal by illumination: A class of two‐or multi‐equivalent reducing agents, called current‐doubling agents, undergoes oxidation by a two‐step mechanism in which reaction with a hole leads to the formation of a radical‐type intermediate, which then injects an electron in the conduction band. Relative hole reactivities for different reagents were determined by making current measurements during competitive oxidation of current‐doubling and noncurrent‐doubling reactants. The reactivity of different radical‐type intermediates toward oxidizing agents was investigated. Experimental support is given for the idea that a common intermediate, the hydrogen atom, is formed during the oxidation of many organic current‐doubling species. Differences in behavior depending on the crystal face are discussed.

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“…However, its electrochemical behavior obeys the classical model of direct, isoenerget}c charge transfer (22,51,52). However, its electrochemical behavior obeys the classical model of direct, isoenerget}c charge transfer (22,51,52).…”

Section: Ov Ov Ovmentioning

confidence: 98%

Mechanisms of Charge Transfer at the Semiconductor‐Electrolyte Interface: I . Kinetics of Electroreduction at Dark of and in Aqueous Solution on a Sintered Nb‐doped Electrode: Influence of pH

Salvador¹,

Gutiérrez

1984

J. Electrochem. Soc.

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The dark cathodic reduction of Fe(CN)e 3-and IrCl62-in aqueous solution on a sintered Nb-doped SrTiO3 electrode, at acidic and basic pH, has been studied as a function of the potential and concentration of the oxidized species. With Fe(CN)83-, two different regions are observed. At low band bending (high ~urrent-density region), the current saturates with increasing concentration of oxidant species, and a pH-independent Tafel slope of -130 mV is found. By contrast, at higher band bending (low current-density region), the current is proportional to the electrolyte concentration, and the Tafel slope increases dramatically at basic pH with respect to that at acidic pH. Ullman's model of isoenergetic electron transfer limited by transport resistance in the semiconductor depletion layer cannot account for this behavior. However, our results are compatible with the two-step kinetic model of charge transfer, involving bandgap surface states, proposed by Vandermolen et al. (16). At least two sets of surface states with different energies within the bandgap actively mediate charge transfer through the semiconductor electrolyte interface. Experiments with IrCle 2-show that these surface states could result from the interaction of the semiconductor surface with H +, OH-, and H20 solvent species.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 141.211.4.224 Downloaded on 2015-07-02 to IP Vol. 131,No. 2

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Mechanism of cathodic processes on the semiconductor zinc oxide

Cited by 45 publications

References 6 publications

Dressed-photon–phonon (DPP)-assisted visible- and infrared-light water splitting

Dressed-photon–phonon (DPP)-assisted visible- and infrared-light water splitting

Chemical Reactions Involving Holes at the Zinc Oxide Single Crystal Anode

Mechanisms of Charge Transfer at the Semiconductor‐Electrolyte Interface: I . Kinetics of Electroreduction at Dark of and in Aqueous Solution on a Sintered Nb‐doped Electrode: Influence of pH

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