skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Room temperature molten salt electrolytes for photoelectrochemical applications

Abstract

Mixtures of aluminum chloride (AlCl/sub 3/) with triethylammonium chloride 1,6-ethyl lutidinium bromide (EtluBr), tert-butyl pyridinium bromide (BPBr), and dialkyl imidazolium chloride (R/sub 2/ImCl), in certain molar ratios yielded ionic liquids at room temperature which were studied with respect to their applicability as electrolytes in photoelectrochemical (PEC) cells. Background voltammograms were obtained for these electrolytes on carbon and n-GaAs electrodes. The anodic stability limit was found to be enhanced on n-GaAs relative to carbon in all cases. The cathodic decomposition potential of the electrolyte showed a smaller positive shift on n-GaAs with the exception of the 3:1 AlCl/sub 3/ BPBr electrolyte. The difference in electrolyte stability behavior on carbon and n-GaAs is interpreted in terms of carrier density effects. Cyclic voltammograms were compared on carbon in the various electrolytes for a model redox system comprising the ferrocene/ferricenium couple. The separation of the cathodic and anodic waves in all the cases was consistent with a quasi-reversible redox behavior--the most sluggish electron transfer being observed in the case of the 3:1 AlCl/sub 3/-BpBr electrolyte. Capacitance-voltage measurements were made on n-GaAs electrodes in contact with the various electrolytes. Flatband-potentials (V /SUB fb/) were deduced from these data using Mott-Schottky plots. The implications of thismore » result for PEC applications and the role of specific ion adsorption of electrolyte species on the electrostatic aspects of the n-GaAs/molten salt electrolyte-interface are discussed with the aid of energy band diagrams.« less

Authors:
; ;
Publication Date:
Research Org.:
Department of Electrical Engineering, Colorado State University, Fort Collins, CO 80523
OSTI Identifier:
5994976
Resource Type:
Journal Article
Journal Name:
J. Sol. Energy Eng.; (United States)
Additional Journal Information:
Journal Volume: 104:3
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; MOLTEN SALTS; ELECTROLYTES; PHOTOELECTROCHEMICAL CELLS; ALUMINIUM CHLORIDES; AMMONIUM CHLORIDES; ANODES; CAPACITANCE; CARBON; ELECTRON TRANSFER; REDOX REACTIONS; STABILITY; TEMPERATURE DEPENDENCE; VOLTAMETRY; ALUMINIUM COMPOUNDS; AMMONIUM COMPOUNDS; AMMONIUM HALIDES; CHEMICAL REACTIONS; CHLORIDES; CHLORINE COMPOUNDS; ELECTRICAL PROPERTIES; ELECTROCHEMICAL CELLS; ELECTRODES; ELEMENTS; EQUIPMENT; HALIDES; HALOGEN COMPOUNDS; NONMETALS; PHYSICAL PROPERTIES; SALTS; SOLAR EQUIPMENT; 400400* - Electrochemistry

Citation Formats

Rajeshwar, K, DuBow, J, and Singh, P. Room temperature molten salt electrolytes for photoelectrochemical applications. United States: N. p., 1982. Web. doi:10.1115/1.3266295.
Rajeshwar, K, DuBow, J, & Singh, P. Room temperature molten salt electrolytes for photoelectrochemical applications. United States. https://doi.org/10.1115/1.3266295
Rajeshwar, K, DuBow, J, and Singh, P. Sun . "Room temperature molten salt electrolytes for photoelectrochemical applications". United States. https://doi.org/10.1115/1.3266295.
@article{osti_5994976,
title = {Room temperature molten salt electrolytes for photoelectrochemical applications},
author = {Rajeshwar, K and DuBow, J and Singh, P},
abstractNote = {Mixtures of aluminum chloride (AlCl/sub 3/) with triethylammonium chloride 1,6-ethyl lutidinium bromide (EtluBr), tert-butyl pyridinium bromide (BPBr), and dialkyl imidazolium chloride (R/sub 2/ImCl), in certain molar ratios yielded ionic liquids at room temperature which were studied with respect to their applicability as electrolytes in photoelectrochemical (PEC) cells. Background voltammograms were obtained for these electrolytes on carbon and n-GaAs electrodes. The anodic stability limit was found to be enhanced on n-GaAs relative to carbon in all cases. The cathodic decomposition potential of the electrolyte showed a smaller positive shift on n-GaAs with the exception of the 3:1 AlCl/sub 3/ BPBr electrolyte. The difference in electrolyte stability behavior on carbon and n-GaAs is interpreted in terms of carrier density effects. Cyclic voltammograms were compared on carbon in the various electrolytes for a model redox system comprising the ferrocene/ferricenium couple. The separation of the cathodic and anodic waves in all the cases was consistent with a quasi-reversible redox behavior--the most sluggish electron transfer being observed in the case of the 3:1 AlCl/sub 3/-BpBr electrolyte. Capacitance-voltage measurements were made on n-GaAs electrodes in contact with the various electrolytes. Flatband-potentials (V /SUB fb/) were deduced from these data using Mott-Schottky plots. The implications of this result for PEC applications and the role of specific ion adsorption of electrolyte species on the electrostatic aspects of the n-GaAs/molten salt electrolyte-interface are discussed with the aid of energy band diagrams.},
doi = {10.1115/1.3266295},
url = {https://www.osti.gov/biblio/5994976}, journal = {J. Sol. Energy Eng.; (United States)},
number = ,
volume = 104:3,
place = {United States},
year = {1982},
month = {8}
}