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Title: Photoelectrochemical behavior of n-Ga-As electrodes in ambient-temperature molten-salt electrolytes

Abstract

Photoelectrochemical (PEC) characterization of n-GaAs electrodes was carried out in room-temperature molten-salt electrolytes by using the aluminum chloride-butylpyridinium chloride (AlCl/sub 3/-BPC) system as a representative example. The working potential limits for the above electrodes in the melts, containing varying ratios of AlCl/sub 3/ and BPC, were established by cyclic voltammetry. Flat-band potential (V/sub fb/) measurements on n-GaAs in the same melts enabled location of the semiconductor band edge positions relative to the melt stability windows. In electrolytes containing AlCl/sub 3/ and BPC in the 1:1 molar ratio, the available range of potential was wide enough to probe the entire band-gap region. On the other hand, the potentials corresponding to the conduction band edges of n-GaAs were beyond the cathodic stability limit of both the 2:1 and 0.75:1 AlCl/sub 3/-BPC compositions. The electrode dissolution behavior of illuminated n-GaAs electrodes was investigated by cyclic voltammetry in melts of varying composition containing no intentionally added electroactive species. The onset of photoanodic corrosion currents was significantly positive of the values observed in aqueous electrolytes. The redox behavior of ferrocene-ferricenium ion couple (Fe(Cp)/sub 2//Fe(Cp)/sub 2//sup +/) was studied by cyclic voltammetry on vitreous carbon electrodes in the 2:1, 0.75:1, and 1:1 AlCl/sub 3/-BPC electrolytes. Underpotentialsmore » developed for the photoanodic process on n-GaAs relative to the reversible (dark) thermodynamic values on vitreous carbon were direct evidence for the sustained conversion of light energy to electrical energy.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Colorado State Univ., Fort Collins
OSTI Identifier:
6811826
Resource Type:
Journal Article
Journal Name:
J. Am. Chem. Soc.; (United States)
Additional Journal Information:
Journal Volume: 102:14
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 14 SOLAR ENERGY; GALLIUM ARSENIDE SOLAR CELLS; ELECTROCHEMISTRY; PHOTOCHEMICAL REACTIONS; SOLAR ENERGY CONVERSION; ALUMINIUM CHLORIDES; ELECTROLYTES; EXPERIMENTAL DATA; MOLTEN SALTS; ORGANIC CHLORINE COMPOUNDS; PYRIDINIUM COMPOUNDS; ALUMINIUM COMPOUNDS; AMINES; AMMONIUM COMPOUNDS; AZINES; CHEMICAL REACTIONS; CHEMISTRY; CHLORIDES; CHLORINE COMPOUNDS; CONVERSION; DATA; DIRECT ENERGY CONVERTERS; ENERGY CONVERSION; EQUIPMENT; HALIDES; HALOGEN COMPOUNDS; HETEROCYCLIC COMPOUNDS; INFORMATION; NUMERICAL DATA; ORGANIC COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; PHOTOELECTRIC CELLS; PHOTOVOLTAIC CELLS; PYRIDINES; QUATERNARY COMPOUNDS; SALTS; SOLAR CELLS; SOLAR EQUIPMENT; 400500* - Photochemistry; 140505 - Solar Energy Conversion- Photochemical, Photobiological, & Thermochemical Conversion- (1980-)

Citation Formats

Singh, P, Rajeshwar, K, DuBow, J, and Job, R. Photoelectrochemical behavior of n-Ga-As electrodes in ambient-temperature molten-salt electrolytes. United States: N. p., 1980. Web. doi:10.1021/ja00534a020.
Singh, P, Rajeshwar, K, DuBow, J, & Job, R. Photoelectrochemical behavior of n-Ga-As electrodes in ambient-temperature molten-salt electrolytes. United States. https://doi.org/10.1021/ja00534a020
Singh, P, Rajeshwar, K, DuBow, J, and Job, R. Wed . "Photoelectrochemical behavior of n-Ga-As electrodes in ambient-temperature molten-salt electrolytes". United States. https://doi.org/10.1021/ja00534a020.
@article{osti_6811826,
title = {Photoelectrochemical behavior of n-Ga-As electrodes in ambient-temperature molten-salt electrolytes},
author = {Singh, P and Rajeshwar, K and DuBow, J and Job, R},
abstractNote = {Photoelectrochemical (PEC) characterization of n-GaAs electrodes was carried out in room-temperature molten-salt electrolytes by using the aluminum chloride-butylpyridinium chloride (AlCl/sub 3/-BPC) system as a representative example. The working potential limits for the above electrodes in the melts, containing varying ratios of AlCl/sub 3/ and BPC, were established by cyclic voltammetry. Flat-band potential (V/sub fb/) measurements on n-GaAs in the same melts enabled location of the semiconductor band edge positions relative to the melt stability windows. In electrolytes containing AlCl/sub 3/ and BPC in the 1:1 molar ratio, the available range of potential was wide enough to probe the entire band-gap region. On the other hand, the potentials corresponding to the conduction band edges of n-GaAs were beyond the cathodic stability limit of both the 2:1 and 0.75:1 AlCl/sub 3/-BPC compositions. The electrode dissolution behavior of illuminated n-GaAs electrodes was investigated by cyclic voltammetry in melts of varying composition containing no intentionally added electroactive species. The onset of photoanodic corrosion currents was significantly positive of the values observed in aqueous electrolytes. The redox behavior of ferrocene-ferricenium ion couple (Fe(Cp)/sub 2//Fe(Cp)/sub 2//sup +/) was studied by cyclic voltammetry on vitreous carbon electrodes in the 2:1, 0.75:1, and 1:1 AlCl/sub 3/-BPC electrolytes. Underpotentials developed for the photoanodic process on n-GaAs relative to the reversible (dark) thermodynamic values on vitreous carbon were direct evidence for the sustained conversion of light energy to electrical energy.},
doi = {10.1021/ja00534a020},
url = {https://www.osti.gov/biblio/6811826}, journal = {J. Am. Chem. Soc.; (United States)},
number = ,
volume = 102:14,
place = {United States},
year = {1980},
month = {7}
}