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Status of photoelectrochemical production of hydrogen and electrical energyThe efficiency for conversion of electromagnetic energy to chemical and electrical energy utilizing semiconductor single crystals as photoanodes in electrochemical cells was investigated. Efficiencies as high as 20 percent were achieved for the conversion of 330 nm radiation to chemical energy in the form of hydrogen by the photoelectrolysis of water in a SrTiO3 based cell. The SrTiO3 photoanodes were shown to be stable in 9.5 M NaOH solutions for periods up to 48 hours. Efficiencies of 9 percent were measured for the conversion of broadband visible radiation to hydrogen using n-type GaAs crystals as photoanodes. Crystals of GaAs coated with 500 nm of gold, silver, or tin for surface passivation show no significant change in efficiency. By suppressing the production of hydrogen in a CdSe-based photogalvanic cell, an efficiency of 9 percent was obtained in conversion of 633 nm light to electrical energy. A CdS-based photogalvanic cell produced a conversion efficiency of 5 percent for 500 nm radiation.
Document ID
19780018922
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Byvik, C. E.
(NASA Langley Research Center Hampton, VA, United States)
Walker, G. H.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 9, 2013
Publication Date
September 1, 1976
Publication Information
Publication: Princeton Univ. Partially Ionized Plasmas, Including the 3rd Symp. on Uranium Plasmas
Subject Category
Energy Production And Conversion
Accession Number
78N26865
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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