The Photochemical Conversion of Solar Energy into Electrical Energy: Eosin-D-Xylose System

2011

Int. J. Energy Res.

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SUMMARY The efforts have been made to convert solar energy into electrical energy by eosin as photosensitizer with different sugars fructose, arabinose, D‐xylose, and mannose systems in photogalvanic cell along with providing them commercial viability using lower concentrations of the solutions. The generated photopotential and photocurrent are 848.0, 679.0, 825.0, and 758.0 mV and 240.0, 240.0, 250.0, and 170.0 μA, respectively. The maximum powers are 203.52, 162.96, 206.25, and 128.86 μW, respectively. The observed conversion efficiency is 0.8415, 0.6461 0.7026, and 0.6812% and the determined fill factors are 0.34, 0.37, 0.28, and 0.27 against the absolute value 1. The developed photogalvanic cell can work for 55.0, 75.0, 85.0, and 90.0 minutes in the dark. The photogeneration electricity is proved by a proposed mechanism. Conclusively, the photogalvanic cell so developed has shown appreciable conversion and storage of solar energy. Copyright © 2011 John Wiley & Sons, Ltd.

Section: Introductionmentioning

confidence: 99%

A comparison of conversion efficiencies of various sugars as reducing agents for the photosensitizer eosin in the photogalvanic cell

2011

Int. J. Energy Res.

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“…25 have studied the dye sensitization for solar energy conversion into electrical energy in congo red–EDTA system. Gangotri and Bhimwal 26 have studied the photochemical conversion of solar energy into electrical energy by use of eosin as the photosensitizer with d ‐Xylose, whereas the performance of photogalvanic cells has been observed by use of Methyl orange as the photosensitizer with d ‐Xylose and sodium lauryl sulphate (NaLS) by Gangotri and Bhimwal 27. Gangotri and Indora 28 have studied the photogalvanic effect in mixed reductants system for solar energy conversion and storage with dextrose and EDTA–Azur A system in photogalvanic cell.…”

Section: Introductionmentioning

confidence: 99%

Study the performance of photogalvanic cells for solar energy conversion and storage: Toluidine blue-D-Xylose-NaLS system

2011

Int. J. Energy Res.

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SUMMARYToluidine blue has been used as the photosensitizer with D-Xylose as the reductant and sodium lauryl sulphate as the surfactant for the enhancement of the conversion efficiency and storage capacity along with reduction in cost of the photogalvanic cell for its commercial viability. The observed value of open circuit voltage is 1110.0 mV and the photogeneration of photopotential is 945.0 mV, whereas the maximum photocurrent is 510.0 mA and the short circuit current or photocurrent at equilibrium is 430.0 mA. The rate of initial generation of photocurrent is 56.66 mA min À1. The determined maximum power and power at power point are 406.35 mW and 148.96 mW, respectively. The observed conversion efficiency is 1.4323%. The fill factor 0.3120 has been experimentally determined at the power point of the cell, where the absolute value is 1.0. The photogalvanic cell so developed can work for 130.0 min in dark if it is irradiated for 145.0 min, i.e. storage capacity of the photogalvanic cell is 89.65%. A mechanism has also been proposed for the photogeneration of the photocurrent.

“…The most recently developed photogalvanic cells have been reported by Genwa and Genwa [20], Genwa et al [21], Gangotri and Indora [22], and Gangotri and Bhimwal [23][24][25]. However, a cheaper system containing eosin and mannose that could enhance the electrical output and storage capacity has never received attention.…”

mentioning

confidence: 95%

Photochemical Conversion of Solar Energy into Electrical Energy in an Eosin–Mannose System

2011

Arab J Sci Eng

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Solar energy has been converted into electrical energy using an eosin-mannose system in a photogalvanic cell. The system uses solutions of sufficiently low concentration to be commercially viable. The photopotential and photocurrent generated by the system were 758.0 mV and 170.0 µA, respectively, while the maximum power and power point were 128.86 and 67.20 µW, respectively. The observed conversion efficiency was 0.6461% and the fill factor was 0.3739 against an absolute value of 1.0. The developed photogalvanic cell can operate for 75 min in the dark following irradiation for 120 min, i.e., the observed storage capacity is 62.5%. A mechanism for the photogeneration of electricity in the system has also been proposed. The developed photogalvanic cell exhibits appreciable conversion efficiency and storage capacity of solar energy, which along with its inexpensive construction make it promising for solar cell applications.