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Tuesday, July 21, 2020 | History

2 edition of Photoelectrochemical reductions using quinone radical anions. found in the catalog.

Photoelectrochemical reductions using quinone radical anions.

Peter K. J. Robertson

Photoelectrochemical reductions using quinone radical anions.

by Peter K. J. Robertson

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  • 24 Currently reading

Published by The Author] in [s.l .
Written in English


Edition Notes

Thesis (D. Phil.) - University of Ulster, 1989.

ID Numbers
Open LibraryOL13873827M

In photoelements using plant or bacterial photosystems, which include pigments, such as Chl. a, b, d, f. and a set of electron carriers, charge separation occurs due to a series of redox reactions. A light-excited pigment molecule quickly transfers electrons to the primary electron. A Photoelectrochemical Biofuel Cell (PEBFC) generating electrical energy directly from sunlight and biomass was investigated. In this paper,the PEBFC had a triarylamine dye-sensitized titanium dioxide(TiO2) film photoanode and Pt black cathode. The electron transport process of the PEBFC was also described. The performances of the PEBFC were obtained by photocurrent–photovoltage Author: Kun Qi Wang, Ying Gao.

Quinone electrochemistry in bacterial photosynthetic reaction centers. The energy levels of the quinone redox intermediates (Fig. 4 A) can be compared in solution and in RCs (Fig. 4 B). Both experimental and calculated E m s and pK a s for reactions in the protein will be considered. In RCs there are only limits for the energies for most Cited by: using organic compound as the electron mediator. 3. Isolation of quinone reducing bacteria Two different kinds of quinone reducing bacteria were isolated from electrochemically accumulated samples by colony isolation using an agar plate and named as G-1 and EMJ-1, respectively (Table 1). From DNA analysis, it was estimated that strain G-.

22–24 have been discussed for the photoelectrochemical (PEC) HER using solar energy. However, these photocathodes have currently restricted utility due to their high cost and/or rapid photo-decomposition in aqueous solution. CuBi 2O 4 is a natural mineral semiconductor with a tetragonal structure, which is (photo-)che mically unstable in. Photoelectrochemical Cell A photoelectrochemical solar cell generally considered to exemplify the promise of these devices is that employing CdSe as the photoelectrode, in comhination with an alkaline aqueous S,, Sz2- redox electrolyte. Since CdSe is an n- File Size: 1MB.


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Photoelectrochemical reductions using quinone radical anions by Peter K. J. Robertson Download PDF EPUB FB2

In "Photoelectrochemical Reductions using Quinone Radical Anions" Robertson, Peter K. / 40th Annual Irish Universities Research Colloquium, NIHE, Dublin, Ireland, May. "Photoelectrochemical Reductions using Quinone Radical Anions".

Author: Peter K. Robertson. The recent literature on photochemical and photoelectrochemical reductions of CO 2 is reviewed. The different methods of achieving light absorption, electron-hole separation, and electrochemical reduction of CO 2 are considered.

Energy gap matching for reduction of CO 2 to different products, including CO, formic acid, and methanol, is used to identify the most promising systems. Photoelectrochemical reduction of CO 2 is a chemical process whereby carbon dioxide is reduced to carbon monoxide or hydrocarbons by the energy of incident light.

This process needs to be catalyzed either homogeneously or heterogeneously in order to proceed, and current research is aimed at developing these catalysts, most of which are semiconducting materials. A "photoelectrochemical cell" is one of two distinct classes of first produces electrical energy similarly to a dye-sensitized photovoltaic cell, which meets the standard definition of a photovoltaic second is a photoelectrolytic cell, that is, a device which uses light incident on a photosensitizer, semiconductor, or aqueous metal immersed in an electrolytic solution to.

Until now, photovoltaics — the conversion of sunlight to electrical power — has been dominated by solid-state junction devices, often made of silicon. But this dominance is now being Author: Michael Grätzel.

Electroanal. Chem., 69 () Elsevier Sequoia S.A., Lausanne -- Printed in The Netherlands INFRARED STUDIES OF QUINONE RADICAL ANIONS AND DIANIONS GENERATED BY FLOW-CELL ELECTROLYSIS BRUCE R. CLARK * and DENNIS H. EVANS ** Department of Chemistry, University of Wisconsin-Madison, Madison, Wisc.

(U.S.A.) (Received 4th August ; in Cited by: Photoelectrochemical conversion of nitrate anions into dinitrogen was successfully achieved by using a photoelectrochemical cell composed of a nanoporous TiO 2 film photoanode and an O 2 reducing cathode in the presence of NH 3, which can be regarded as a model of denitrification and is of importance for environmental by: 6.

These quinone radical anions are reduced to quinone dianions and as dianions are more reactive, the reversibility of the last two waves is significantly reduced compared to that of first two waves.

In presence of a strong acid like HClO 4 the calix--quinone undergoes eight-proton eight-electron by: 1H hyperfine (hf) coupling constants of semiquinone radical anions of 1,4-naphthoquinone, 2-methyl-1,4-naphthoquinone, and 2-methylphytyl-1,4-naphthoquinone in frozen alcoholic solutions were.

Photoelectrochemical oxidation of anions by WO3 in aqueous and nonaqueous electrolytes confirmed by radical scavenger experiment, is up to × 10−4 s−1, which was ~ times that ( The recent literature on photochemical and photoelectrochemical reductions of CO(2) is reviewed.

The different methods of achieving light absorption, electron-hole separation, and electrochemical reduction of CO(2) are considered. Energy gap matching for reduction of CO(2) to different products, including CO, formic acid, and methanol, is used Cited by: After min photoelectrochemical reduction of CO 2 using the g-C 3 N 4 and BCN electrodes, products as a result of CO 2 reduction were analyzed by Micro GC, Capillary GC and Ionic chromatography.

The main product of CO 2 photoelectrochemical reduction over the BCN electrode was ethanol (C 2 H 5 OH). CO was also detected as a minor by: The behavior of WO 3 photoanodes has been investigated in contact with a combination of four anions (Cl −, CH 3 SO 3 −, HSO 4 −, and ClO 4 −) and three solvents (water, acetonitrile, and propylene carbonate), to elucidate the role of the semiconductor surface, the electrolyte, and redox kinetics on the current density vs.

potential properties of n-type WO by:   The recent literature on photochemical and photoelectrochemical reductions of CO 2 is reviewed. The different methods of achieving light absorption, electron-hole separation, and electrochemical reduction of CO 2 are considered. Energy gap matching for reduction of CO 2 to different products, including CO, formic acid, and methanol, is used to identify the most promising systems.

We report the redox activity of quinone materials, in the presence of ionic liquids, with the ability to bind reversibly to CO2. The reduction potential at which 1,4-naphthoquinone transforms to the quinone dianion depends on the strength of the hydrogen-bonding characteristics of the ionic liquid solvent; under CO2, this transformation occurs at much lower potentials than in a CO2-inert Cited by:   Five 6′-nitrospiro[indole-benzopyrans] have been reduced electrochemically in ACN to the corresponding radical anions.

Their reduction potentials were in the range to V versus SCE, that is in the range expected for substituted nitrobenzenes. The EPR spectra of the species resulting from chemical reduction of the same compounds were also recorded, and suggested that the structure Cited by: 6. Stereoelectronic effects in intramolecular long-distance electron transfer in radical anions as predicted by ab-initio MO calculations.

Journal of the American Chemical Society(6), DOI: /jaa Addy by: Conclusion Theoretical calculations show a maximum solar to electric conversion efficiency of about 33% for a single junction PV cell. Most suitable semiconductors for conversion of solar radiation have a band gap between and eV.

Single crystal based PV cells show highest efficiencies but are too expensive and takes a long time to produce. Application: Photo-electrochemical Cell (PEC) Photoelectrochemical (PEC) cells offer a promising method of hydrogen production driven directly by solar energy, however materials limitations have significantly hindered their efficiency.

The objective of our research is to improve the efficiencies of PEC cells by identifying and engineering. Photoelectrochemical process is an environmentally friendly technology and has a wide application in the control of environmental pollutants. Efficient nanophotocatalysts responsive to visible light are still highly attractive.

In this work, α-Fe2O3/TiO2 were grown on fluorine doped tin oxide (FTO) substrates by hydrothermal method for photoelectrochemical reduction of Cr(VI).Cited by: 4.

bard 1 PhotoelectrochemicalSolarEnergyStorage Cells StuartLicht Technion–Israel Institute of Technology, Haifa,Israel Introduction Although society. Recent reports have demonstrated the possibility of using photoactive, biological membrane components in photoelectro-chemical cells1.

Such systems have produced small photovoltages and photocurrents.Photoelectrochemical Oxidation of Anions by WO3 in Aqueous and Nonaqueous Electrolytes by Qixi Mi, Robert H.

Coridan, Bruce S. Brunschwig, Harry B. Gray,* and Nathan S. Lewis* (A) (B) Fig. S1 Scanning electron micrographs of (A) WO3/FTO and (B) WO3/W photoanodes. Electronic Supplementary Material (ESI) for Energy & Environmental Science.