Photovoltaic conversion by macromolecular thionine films

Tamilarasan, R.; Natarajan, P.

doi:10.1038/292224a0

Cited by 45 publications

(23 citation statements)

References 10 publications

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“…The irradiation of a Pt/Nf/TH electrode in the presence of Fe 2þ and H þ ions, produced one-electron reduced semithionine (TH(H) þÅ ) and ferric ions. The formation of an intermediate complex of a semireduced phenothiazine dye with Fe 3þ ion ([TH(H) þÅ Á Á ÁFe 3þ ]) in homogeneous solution [37] and at a TH coated electrode [36,38] has been suggested for the excited state quenching of phenothiazine dyes by iron complexes. Further, the intermediate complex of ([TH(H) þÅ Á Á ÁFe 3þ ]) has been confirmed by flash photolysis experiments [39].…”

Section: Photogalvanic Effect Of Nf/th and Tba-nf/th Filmsmentioning

confidence: 99%

Microenvironment effects on the electrochemical and photoelectrochemical properties of thionine loaded Nafion® films

John

Ramaraj

2004

Journal of Electroanalytical Chemistry

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Section: Photogalvanic Effect Of Nf/th and Tba-nf/th Filmsmentioning

confidence: 99%

Microenvironment effects on the electrochemical and photoelectrochemical properties of thionine loaded Nafion® films

John

Ramaraj

2004

Journal of Electroanalytical Chemistry

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“…On the basis of principles given by various scientists like Tamilarasan and Natarajan Kaneko and Yamada, Rabinowitch, Gomer, and so forth, the mechanism of solar power generation and storage in PG may be described as below .…”

Section: Mechanism Of Solar Power Generation and Storage In Pgmentioning

confidence: 99%

“…At SCE (Dark Chamber‐cathode), the photosensitizer molecule accepts an electron (coming from Pt electrode through external circuit) from electrode and gets converted into semi or leuco form. Finally, leuco/semi form of photosensitizer and oxidized form of reductant combine to give original photosensitizer and reductant molecules in dark chamber . This cycle goes on in cell.…”

Section: Mechanism Of Solar Power Generation and Storage In Pgmentioning

confidence: 99%

“…As far as the filled gap of the outcome of research in the field is concerned, the literature survey reveals that the earlier researcher emphasized more on mechanism, kinetics, and other insights of photogalvanic cells. In earlier studies, the lower electrical output might have been due to some complex and unsuitable cell fabrication parameters like use of light‐intercepting black plate between electrode chambers, platinum (Pt) electrode in both chambers, coated Pt, only visible rays for illumination, and acidic medium (low pH like 6) . The encouraging forecast by Albery and Archer that efficiency of these cells could be as high as 18% has been motivating researchers for working on photogalvanic cells, and it has also resulted into tremendous enhancement in cell performance arousing hope that these cells may be the future energy.…”

Section: Introductionmentioning

confidence: 99%

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Photogalvanic cells: only solar cells having dual role of solar power generation and storage

Koli

2017

WIREs Energy & Environment

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Solar cell converts solar energy into electricity directly. Among such solar cells, the photogalvanic cells are unique as these are only solar cells that are capable of doing solar power generation and storage simultaneously. Therefore, such an inherent solar power storage capacity that too with good efficiency of these cells needs to be exploited for making solar cell technology a reliable source of power in the future. The fabrication and experimentation of photogalvanic cells is very simple to demonstrate its unique property. The power, short-circuit current, open-circuit potential, conversion efficiency, and power storage (in terms of half change time) for photogalvanic cells are reported of the order of 1159 μW, 4500 μA, 1.07 V, 14, and 260 min, respectively. However, to make photogalvanic cells realty in life for simultaneous solar power and storage, some challenges have to be tackled. Some of the challenges are photodecay of dye, corrosion of platinum (Pt), evaporation of liquid, breaking vulnerability of SCE/combination electrode, further need to increase the power and efficiency and storage, assembly operation of cells for augmentation of power, cell study in natural sunlight, and so on.

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“…The photo-oxidation of ferrous ion in solution by the excited state of thionine dye on visible light absorption is known since a long time. 50 The photoproducts recombine in dark to generate the reactants back in solution. The photogalvanic potentials generated by this cyclic process is examined for solar energy conversion.…”

Section: Photovoltaic Conversion At the Electrodes In Macromolecular mentioning

confidence: 99%

Photoprocesses of coordination compounds and dyes in solution and nanoporous materials: Evolution from milliseconds to femtoseconds#

2011

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The photoredox reactions of cobalt(III), nickel(II) complexes and organic dyes are reviewed with particular emphasis on using flash photolysis methods to identify the transients in the time scale from milliseconds to subpicoseconds. The excitation flash radiation initially was limited to flash lamps with a time resolution to study the decay of the excited states and the fast reactions of photo produced transients in milliseconds and microseconds. Some of the photolysis reactions investigated provide details in real time including the thermal reactions of molecular oxygen with cobalt(II) amine systems and the cobalt (III) alkyl complex formation on photolysis of cobalt(III) aminoacid complexes. Photoredox reactions of thiazine and safranine dyes are investigated using time resolved absorption and emission techniques in solution and on encapsulation in micro and mesoporous host materials. Picosecond and femtosecond diffuse reflectance fluorescence investigations in the porous solid host materials show intramolecular proton transfer reactions of the dyes and deprotonation of the dyes in the excited states. Photosensitization of nanoparticles of semiconductors, anatase TiO 2 and ZnO by the excited states of dyes in meso and microporous silicate hosts is investigated using pico and femtosecond fluorescence and transient absorptions techniques and the results are reviewed.

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Photovoltaic conversion by macromolecular thionine films

Cited by 45 publications

References 10 publications

Microenvironment effects on the electrochemical and photoelectrochemical properties of thionine loaded Nafion® films

Microenvironment effects on the electrochemical and photoelectrochemical properties of thionine loaded Nafion® films

Photogalvanic cells: only solar cells having dual role of solar power generation and storage

Photoprocesses of coordination compounds and dyes in solution and nanoporous materials: Evolution from milliseconds to femtoseconds#

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