Reaction of excited dye molecules at electrodes

Gerischer, H.; Willig, F.

doi:10.1007/bfb0046057

Cited by 259 publications

(125 citation statements)

References 71 publications

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“…The absence of any additional light-induced redox processes indicates that the microblast deposited semiconductor is photochemically stable. 63,64 Sample A coatings were sensitized with Erythrosin B (ERY) dye as outlined in the experimental part. 41 The sensitization of the ERY-modified NiO x coatings was achieved as verified by the increase of optical absorption in the visible spectrum in passing from bare NiO x coating to its ERY-sensitized version ( Figure 10).…”

Section: Electrochemical Properties Of Microblast Deposited Nio Xmentioning

confidence: 99%

Electrochemical characterization of NiO electrodes deposited via a scalable powder microblasting technique

Awais

Dini

MacElroy

et al. 2013

Journal of Electroanalytical Chemistry

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Publication information Journal of Electroanalytical Chemistry, Publisher Elsevier The UCD community has made this article openly available. Please share how this access benefits you. Your story matters! (@ucd_oa) Some rights reserved. For more information, please see the item record link above. In this contribution a novel powder coating processing technique (microblasting) for the fabrication of nickel oxide (NiOx) coatings is reported. ∼1.2 μm thick NiOx coatings are deposited at 20 mm2 s−1 by the bombardment of the NiOx powder onto a Ni sheet using an air jet at a speed of more than 180 m s−1. Microblast deposited NiOx coatings can be prepared at a high processing rate, do not need further thermal treatment. Therefore, this scalable method is time and energy efficient. The mechano-chemical bonding between the powder particles and substrate results in the formation of strongly adherent NiOx coatings. Microstructural analyses were carried out using SEM, the chemical composition and coatings orientation were determined by XPS and XRD, respectively. The electroactivity of the microblast deposited NiOx coatings was compared with that of NiOx coatings obtained by sintering NiOx nanoparticles previously sprayed onto Ni sheets. In the absence of a redox mediator in the electrolyte, the reduction current of microblast deposited NiOx coatings, when analyzed in anhydrous environment, was two times larger than that produced by higher porosity NiOx nanoparticles coatings of the same thickness obtained through spray coating followed by sintering. Under analogous experimental conditions thin layers of NiOx obtained by using the sol-gel method, ultrasonic spray-and electro-deposition show generally lower current density with respect to microblast samples of the same thickness. The electrochemical reduction of NiOx coatings is controlled by the bulk characteristics of the oxide and the relatively ordered structure of microblast NiOx coatings with respect to sintered NiOx nanoparticles here considered, is expected to increase the electron mobility and ionic charge diffusion lengths in the microblast samples. Finally, the increased level of adhesion of the microblast film on the metallic substrate affords a good electrical contact at the metal/metal oxide interface, and constitutes another reason in support of the choice of microblast as low-cost and scalable deposition method for oxide layers to be employed in electrochemical applications. Electrochemical characterization of NiO electrodes deposited via a scalable powder microblasting technique

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Section: Electrochemical Properties Of Microblast Deposited Nio Xmentioning

confidence: 99%

Electrochemical characterization of NiO electrodes deposited via a scalable powder microblasting technique

Awais

Dini

MacElroy

et al. 2013

Journal of Electroanalytical Chemistry

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“…The early photocehmical studies on aqueous solutions of organic wastewater in the presence of inorganic semiconductors such as silver halides, ZnO, and the like were driven by applications in electro-and photography (Gerischer & Willig, 1976;Memming, 1984). The first example for observing dye instability in the presence of an inorganic semiconductor (TiO 2 ) and illumination appears to be in 1969 when the photocatalytic reduction of Methylene blue to the leuco form was reported (Pamfilov et al, 1969;Yoneyama et al, 1972).…”

Section: Photocatalysis Oxidationmentioning

confidence: 99%

Status and Prospects of Concentrated Organic Wastewater Degradation

Liu¹,

DuShu²,

Yi³

et al. 2012

Industrial Waste

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“…The redox properties of semiconductor pigment particles are related to their band structure [25]. The fundamental photophysics of these materials has important implications for the application of semiconductors in photography [26; 27 electrophotography [28], photoelectrochemistry and photovoltaics [4].…”

Section: Reductive Photofragmentationmentioning

confidence: 99%

Electron transfer induced photofragmentation as a route to free radicals

Eaton¹

1984

Pure and Applied Chemistry

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Abstract. This paper describes the use of electron transfer induced photofragmentation reactions for the generation of free radicals. Two general reactions (eqns. 1, 2) are presented. Equation I(1)describes oxidative fragmentation of an electron rich species, D-Y, which quenches a sensitizer S' by donation of an electron to produce a kinetically unstable cation radical (D-Y-f-.) which rapidly dissociates to yield a radical (D.) and a cationic (Y+) fragment. Similarly, in eq. 2, reductive fragmentation results from quenching of S by an electron poor quencher A-X whose anion radical (A-X-.) is kinetically unstable. Examples of each are presented, and the physical properties of the donor and acceptor which promote these processes are described.

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Reaction of excited dye molecules at electrodes

Cited by 259 publications

References 71 publications

Electrochemical characterization of NiO electrodes deposited via a scalable powder microblasting technique

Electrochemical characterization of NiO electrodes deposited via a scalable powder microblasting technique

Status and Prospects of Concentrated Organic Wastewater Degradation

Electron transfer induced photofragmentation as a route to free radicals

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