Photogalvanic cells

Archer, Mary D.; Isabel, María; Ferreira, C. U.; Albery, W. John; Hillman, A. Robert

doi:10.1016/s0022-0728(80)80050-7

Cited by 23 publications

(7 citation statements)

References 20 publications

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“…Similarly, for Fe, Co, Ni, Cu, and Zn monophthalocyanine film electrodes, changes in the redox state of the film results in the corresponding uptake or elimination of the anion of the electrolyte, as determined by Auger electron spectrometry (19). Similar effects on thionine film electrodes have been observed by Albery et al (20,21). Charge neutralization is also a general feature of polymer electrodes displaying redox properties (16,22), and the understanding of the mechanism of anion incorporation is of general importance.…”

Section: The Kinetics Of the Color Transitionsupporting

confidence: 60%

“…Albery et al (20) used this approach for the thionine film electrodes and considered that the E~ ~ values were spread in a gaussian distribution around the average value of the standard potential of the film. The cycled lutetium biphthalocyanine electrodes studied appear to have a much wider spread of redox potentials for the different centers than that encountered in the thionine films (20,21) or in other polymer electrodes (14)(15)(16)(17). The physical basis of a gaussian distribution corresponds to a model where all distinct microscopic states of the assembly are equally probable and independent of each other.…”

Section: Qi(t)mentioning

confidence: 97%

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The Properties of Electrochromic Film Electrodes of Lanthanide Diphthalocyanines in Ethylene Glycol

Collins

Schiffrin

1985

J. Electrochem. Soc.

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The electrochromic properties of film electrodes of lutetium, erbium, gadolinium, and ytterbium diphthalocyanines in contact with ethylene glycol solutions have been studied. The stability of the electrochromic film under electrochemical cycling in this medium is at least three orders of magnitude better than that in neutral aqueous solutions. The stability of the electrochromic is improved if the film is written galvanostatically from the yellow‐tan to the green state. A simplified model for the galvanostatic transition is proposed, and some of the problems of this family of electrochromic materials are discussed.

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Section: The Kinetics Of the Color Transitionsupporting

confidence: 60%

Section: Qi(t)mentioning

confidence: 97%

The Properties of Electrochromic Film Electrodes of Lanthanide Diphthalocyanines in Ethylene Glycol

Collins

Schiffrin

1985

J. Electrochem. Soc.

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“…Discussion We now turn to analyze our results in relation to potential improvements in the efficiency of the iron/thionine photogalvanic cell (18,21,22,24). A recent study finds that (under the conditions of the experiment, i.e., with thick thionine layers) both the ferrous/ferric and the leucothionine/thionine pairs are substantially suppressed, suggesting that the thionine-coated electrode is not truly selective, the reversibility at the coated electrode reported earlier for the thionine couple in solution arising from facile redox chemistry of the electroactive polymeric units present in the dye coat.…”

Section: Resultsmentioning

confidence: 99%

“…This behavior of the parent iron-thionine system can be explained considering that almost perfect electrode selectivity can be achieved in this instance due to the adsorption (16) and staining (17) properties of the parent TH. About one monolayer of the compound spontaneously self-deposits onto the Pt ring by adsorption and makes it selective towards the leucothionine/thionine pair by blocking the ferric-toferrous reaction (18).…”

Section: Resultsmentioning

confidence: 99%

“…First, we consider that much of the work with the parent thionine on bare and thionine-coated electrodes is difficult to interpret since, due to the adsorption properties of the thionine molecule (16, 17), a film of aggregated polythionine deposits on the electrode by adsorption (18). This difficulty is removed either by measuring, only for short periods, photocurrents generated with the parent thionine, using a freshly polished electrode, or by the measurement at leisure of photocurrents generated with the disulfonated thionines, since they have no tendency to adsorb onto metal electrodes or glass surfaces (10a).…”

Section: Resultsmentioning

confidence: 99%

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Photoelectrochemistry with the Rotating Optical Disk Ring Electrode: II . The Thionine‐Coated Electrode Is Selective to the Leuco Forms of the Parent Thionine and the 2,6‐ and 4,6‐Disulfonated Thionine Derivatives

Riefkohl¹,

Rodriguez²,

Romero³

et al. 1986

J. Electrochem. Soc.

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Results are reported on the dark electrochemistry and photoelectrochemistry of thionine (TH) and two of its disulfonated derivatives (2,6-DST and 4,6-DST) on the title electrode (RODRE) that clearly indicate that coating of the electrode with a thin layer of polymeric thionine is crucial for measurement of sizable photoinduced ring currents. The parent TH does not require the polymeric coat since, due to its adsorption and aggregation properties, a One to two monolayer film of aggregated molecules spontaneously coats the electrode. The advantage of using, in addition to the lipophilic TH, the hydrophilic DST's rests in the lack of adsorption properties for the latter since, otherwise, their photophysical, photochemical, and electrochemical properties are quite similar, the presence of the sulfonates representing only a second-order effect. These findings are consistent and help to explain the recently published observation that the measured efficiency of the parent iron-thionine system drops by a factor of 19 or more when semitransparent gold electrodes coated with thick polythionine layers are utilized in experimental photogalvanic cells. The key to these results has been the application to this problem of an optical rotating electrode, the RODRE, which combines two different surfaces on the same electrode: the transparent disk surface, used to illuminate the photogalvanic solution, and the Pt metal ring surface, used to detect stable electroactive species photochemically generated in the disk zone. In the RODRE, the ring detector is effectively maintained in the dark and, thus, photocurrents arising from species in solution can be easily separated from photocurrents arising from species in the coat. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.255.6.125 Downloaded on 2015-06-06 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.255.6.125 Downloaded on 2015-06-06 to IP

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The Effect of Fluoride on the Aqueous Iron–Thionine Photogalvanic System

Archer

Wilford

Ferreira

1982

Israel Journal of Chemistry

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The influence of fluoride ions on the photocurrent and photostationary state composition of the acid, aqueous iron-thionine system at bare and thioninecoated platinum electrodes was investigated. Observed photocurrents are in some circumstances increased by the addition of fluoride, in accordance with the theory of characteristic lengths of Albery et al. However, the Gibbs energy of the forward reaction, and hence the open-circuit voltage available from a differential photogalvanic cell, are sharply decreased.(15)

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Photogalvanic cells

Cited by 23 publications

References 20 publications

The Properties of Electrochromic Film Electrodes of Lanthanide Diphthalocyanines in Ethylene Glycol

The Properties of Electrochromic Film Electrodes of Lanthanide Diphthalocyanines in Ethylene Glycol

Photoelectrochemistry with the Rotating Optical Disk Ring Electrode: II . The Thionine‐Coated Electrode Is Selective to the Leuco Forms of the Parent Thionine and the 2,6‐ and 4,6‐Disulfonated Thionine Derivatives

The Effect of Fluoride on the Aqueous Iron–Thionine Photogalvanic System

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