Fundamentals of Semiconductor Electrochemistry and Photoelectrochemistry

Rajeshwar, Krishnan

doi:10.1002/9783527610426.bard060001

Cited by 57 publications

(40 citation statements)

References 269 publications

(291 reference statements)

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“…ZnO [74]. In this case, beyond the doping process promotes the creation of inter-band between CB and VB promoted by oxygen vacancies during the N doping process, which increase the light harvesting, mainly in the visible region [72,75], N doping process modify the VB and CB edge.…”

Section: Materials Characterizationmentioning

confidence: 99%

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

et al. 2017

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Photocatalytic materials can perform oxidative and reductive reactions over their surfaces when excited with light. Intrinsic characteristics of the material such as superficial area, morphological structure, and crystalline phase exposition play a fundamental role in the corresponding reaction paths. However, especially in doped semiconductors, as ZnO:N, less is known about how the synthesis parameters affect the morphologies and the photocatalytic activity simultaneously. To solve this issue, ZnO and ZnO:N samples were obtained using microwave-assisted hydrothermal and modified polymeric precursor methods of synthesis. Samples morphologies were characterized by TEM and FE-SEM. Crystallographic phases were observed by XRD and optical characteristics by DRS. XPS results confirmed the doping process. Degradation of Rhodamine-B and Cr(VI) reduction were employed as probe reactions to investigate their photocatalytic activity. Although the crystallographic structure of these powders maintains the ZnO hexagonal wurtzite structure, the optical properties and morphologies, and photocatalytic activities present different behaviors. Also, density functional theory calculations were employed to determine the specific features related to electronic structure, morphology, and photocatalytic activity.Different synthesis methods produce a singular behavior in the physicochemical properties of materials, and the doping effect produces various modifications in RhB degradation and Cr(VI) reduction for each synthesis method. Crystal face exposition and morphologies are related to the improvement in the photocatalytic activity of the materials.

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Section: Materials Characterizationmentioning

confidence: 99%

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

et al. 2017

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“…Meadowcroft [21] proposed that amphoterism is additionally required (or in his words "having both p-and n-type conductivity"). An introduction to the semiconductor physics of oxides is beyond the scope of this review and the reader is referred to other reviews [20,82] and books [83][84][85] on the topic. Nonetheless, a very short introduction of relevant concepts is provided here.…”

Section: Effect Of Chemical Substitution On Activitymentioning

confidence: 99%

Perovskite Electrocatalysts for the Oxygen Reduction Reaction in Alkaline Media

Risch

2017

Catalysts

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Abstract:Oxygen reduction is considered a key reaction for electrochemical energy conversion but slow kinetics hamper application in fuel cells and metal-air batteries. In this review, the prospect of perovskite oxides for the oxygen reduction reaction (ORR) in alkaline media is reviewed with respect to fundamental insight into activity and possible mechanisms. For gaining these insights, special emphasis is placed on highly crystalline perovskite films that have only recently become available for electrochemical interrogation. The prospects for applications are evaluated based on recent progress in the synthesis of perovskite nanoparticles. The review concludes with the current understanding of oxygen reduction on perovskite oxides and a perspective on opportunities for future fundamental and applied research.

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“…Moreover, a photocurrent switching effect is evident: either anodic or cathodic photocurrents are generated, depending on the applied potential. This phenomenon, sometimes referred to as anomalous photoeffect (APE) have been previously observed as a crossover of dark and light current/potential characteristics [44]. The origin of APE is still not understood, but is likely bound to either the presence of surface state, that can induce a partial Fermi level pinning (band unpinning) and that are found to accumulate charge around the switch potential [45], or to the presence of an adsorbed redox couple, inducing the so-called PEPS (photoelectrochemical photocurrent switching) effect, which implies also a photocurrent shift in dependence on the incident wavelength [46].…”

Section: Titanium Dioxide (Tiomentioning

confidence: 96%

Achieving efficient H2O2 production by a visible-light absorbing, highly stable photosensitized TiO2

Baran

Wojtyła²,

Minguzzi

et al. 2019

Applied Catalysis B: Environmental

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In this paper we propose titanium dioxide modified with cobalt(II) 2ethylhexanoate (Co@TiO 2) as photoactive material for the efficient visible light driven production of H 2 O 2. We demonstrate that visible light activity can be achieved thanks to a photoinduced electron transfer from the excited complex towards the TiO 2 conduction band that corresponds to a cobalt-to-titanium-charge-transfer transition. H 2 O 2 is synthetized by a combination of oxygen reduction and water oxidation, that is possible thanks to the correct band position of Co@TiO 2. A mechanism of H 2 O 2 formation is suggested on the basis of experimental evidences. Reactive oxygen intermediates, together with H 2 O 2 are responsible for the photocatalytic degradation of a nonionic surfactant, of methylene blue and of phenol for wastewater treatments. Finally, and quite interestingly, Co@TiO 2 can be also used in a photoelectrochemical setup, where it can be adopted both as photoanode and photocatode, and the switching potential corresponds to the redox potential of the adsorbed complex Co(III)/Co(II) couple.

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Fundamentals of Semiconductor Electrochemistry and Photoelectrochemistry

Cited by 57 publications

References 269 publications

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

Perovskite Electrocatalysts for the Oxygen Reduction Reaction in Alkaline Media

Achieving efficient H2O2 production by a visible-light absorbing, highly stable photosensitized TiO2

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