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Title: Photoelectrochemical characterization of the n-InP/room temperature molten salt electrolyte interface

Abstract

Photoelectrochemical (PEC) characterization of the n-InP/A1C1/sub 3/-butyl pyridinium chloride (BPC) interface was carried out using cyclic and linear sweep voltammetry, capacitance-voltage measurements, and automated admittance spectroscopy. The surface energy levels of n-InP electrodes in A1C1/sub 3/-BPC mixtures were a sensitive function of electrolyte acidity. Capacitance-voltage measurements in electrolytes having A1C1/sub 3/-BPC molar ratios varying between 0.8:1 and 2:1 revealed a systematic shift in the flatband potentials (V /SUB FB/ ) toward negative potentials in basic systems, an effect attributed to specified adsorption of C1/sup -/ ions on the electrode surface. The stability range of the A1C1/sub 3/-BPC electrolyte on n-InP was also dependent on electrolyte acidity, the cathodic current onset shifting to negative potentials with increasing basicity. Electrostatic effects at the n-InP/A1C1/sub 3/-BPC interface are invoked to explain these trends. Cyclic voltammetry revealed that ferrocene (Fe(Cp)/sub 2/) could be photoelectrochemically oxidized on n-InP in basic A1C1/sub 3/-BPC systems. In acidic systems, however, no photoeffects were observed. These results could be rationalized under the framework of the simplified energy band model proposed by previous authors for the semiconductor/electrolyte interface. Uphill photo-oxidation on anthracene (A) and diphenyl anthracene (DPA) could also be effected on n-InP electrodes in acidic (greater than or equalmore » to about 1.25:1 composition) electrolytes. Although the general PEC behavior of the n-InP/A1C1/sub 3/-BPC interface was entirely consistent with the simple model, specific interaction of electroactive species, such as A and DPA, with the electrode surface did result in departures from model predictions.« less

Authors:
; ;
Publication Date:
Research Org.:
Department of Electrical Engineering, Colorado State University, Fort Collins, Colorado
OSTI Identifier:
5425486
Resource Type:
Journal Article
Journal Name:
J. Electrochem. Soc.; (United States)
Additional Journal Information:
Journal Volume: 129:9
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; PHOTOELECTROCHEMICAL CELLS; ELECTRODES; ELECTROLYTES; INTERFACES; INDIUM PHOSPHIDES; PH VALUE; PHOTOELECTROLYTIC CELLS; STABILITY; ELECTROCHEMICAL CELLS; ELECTROLYTIC CELLS; EQUIPMENT; INDIUM COMPOUNDS; PHOSPHIDES; PHOSPHORUS COMPOUNDS; PNICTIDES; SOLAR EQUIPMENT; 140505* - Solar Energy Conversion- Photochemical, Photobiological, & Thermochemical Conversion- (1980-)

Citation Formats

Thapar, R, DuBow, J, and Rajeshwar, K. Photoelectrochemical characterization of the n-InP/room temperature molten salt electrolyte interface. United States: N. p., 1982. Web. doi:10.1149/1.2124341.
Thapar, R, DuBow, J, & Rajeshwar, K. Photoelectrochemical characterization of the n-InP/room temperature molten salt electrolyte interface. United States. https://doi.org/10.1149/1.2124341
Thapar, R, DuBow, J, and Rajeshwar, K. Wed . "Photoelectrochemical characterization of the n-InP/room temperature molten salt electrolyte interface". United States. https://doi.org/10.1149/1.2124341.
@article{osti_5425486,
title = {Photoelectrochemical characterization of the n-InP/room temperature molten salt electrolyte interface},
author = {Thapar, R and DuBow, J and Rajeshwar, K},
abstractNote = {Photoelectrochemical (PEC) characterization of the n-InP/A1C1/sub 3/-butyl pyridinium chloride (BPC) interface was carried out using cyclic and linear sweep voltammetry, capacitance-voltage measurements, and automated admittance spectroscopy. The surface energy levels of n-InP electrodes in A1C1/sub 3/-BPC mixtures were a sensitive function of electrolyte acidity. Capacitance-voltage measurements in electrolytes having A1C1/sub 3/-BPC molar ratios varying between 0.8:1 and 2:1 revealed a systematic shift in the flatband potentials (V /SUB FB/ ) toward negative potentials in basic systems, an effect attributed to specified adsorption of C1/sup -/ ions on the electrode surface. The stability range of the A1C1/sub 3/-BPC electrolyte on n-InP was also dependent on electrolyte acidity, the cathodic current onset shifting to negative potentials with increasing basicity. Electrostatic effects at the n-InP/A1C1/sub 3/-BPC interface are invoked to explain these trends. Cyclic voltammetry revealed that ferrocene (Fe(Cp)/sub 2/) could be photoelectrochemically oxidized on n-InP in basic A1C1/sub 3/-BPC systems. In acidic systems, however, no photoeffects were observed. These results could be rationalized under the framework of the simplified energy band model proposed by previous authors for the semiconductor/electrolyte interface. Uphill photo-oxidation on anthracene (A) and diphenyl anthracene (DPA) could also be effected on n-InP electrodes in acidic (greater than or equal to about 1.25:1 composition) electrolytes. Although the general PEC behavior of the n-InP/A1C1/sub 3/-BPC interface was entirely consistent with the simple model, specific interaction of electroactive species, such as A and DPA, with the electrode surface did result in departures from model predictions.},
doi = {10.1149/1.2124341},
url = {https://www.osti.gov/biblio/5425486}, journal = {J. Electrochem. Soc.; (United States)},
number = ,
volume = 129:9,
place = {United States},
year = {1982},
month = {9}
}