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Title: n-Type molybdenum diselenide-based photoelectrochemical cells: evidence for Fermi level pinning and comparison of the efficiency for conversion of light to electricity with various solvent/halogen/halide combinations

Abstract

Interfacial energetics for n-type MoSe/sub 2/ (E/sub g/ = 1.4 eV, direct) and photoelectrochemical conversion of light to electrical energy in the presence of X/sub n//sup -//X/sup -/ (X = Cl, Br, I) have been characterized in CH/sub 3/CN electrolyte solution. Cyclic voltammetry for a set of reversible (at Pt electrodes) redox couples whose formal potential, E/sup 0/, spans a range -0.8 to +1.5 V vs CES has been employed to establish the interface energetics of MoSe/sub 2/. The extent to which the photoanodic current peak is more negative than at Pt is a measure of the output photovoltage for a given couple. Conversion of greater than or equal to E/sub g/ light to electricity can be sustained in CH/sub 3/CN solutions of X/sub n//sup -//X/sup -/ (X = Cl, Br, I) with an efficiency that is ordered Cl > Br > I where n-type MoSe/sub 2/ is used as a stable photoanode. In aqueous solution n-type MoSe/sub 2/ is not a stable anode in the presence of similar concentrations of Br/sub 2//Br/sup -/ or Cl/sub 2//Cl/sup -/, showing an important role for solvent in thermodynamics for electrode decomposition. In CH/sub 3/CN, efficiency for conversion of 632.8-nm light to electricitymore » has been found to be up to 7.5% for Cl/sub 2//Cl/sup -/, 1.4% for Br/sub 2//Br/sup -/, and 0.14% for I/sub 3//sup -//I/sup -/. Differences among those redox systems are output voltage and short-circuit current, accounting for the changes in efficiency. In H/sub 2/O, I/sub 3//sup -//I/sup -/ yields a stable n-type MoSe/sub 2/-based photoelectrochemical cell with an efficiency for 632.8-nm light a little lower than that for the CH/sub 3/CN/Cl/sub 2//Cl/sup -/ solvent/redox couple system. Data for MoS/sub 2/-based cells in the CH/sub 3/CN/X/sub n//sup -//X/sup -/ solvent/redox couple systems show that the efficiency again depends on X: Cl > Br > I. In H/sub 2/O/I/sub 3//sup -//I/sup -/ an efficiency a little lower than that for the CH/sub 3/CN/Cl/sub 2//Cl/sup -/ is obtained. MoSe/sub 2/-based cells are somewhat more efficient than MoS/sub 2/-based cells, but significant variations in efficiency are found depending on the electrode sample used. 5 figures, 4 tables.« less

Authors:
;
Publication Date:
Research Org.:
Massachusetts Inst. of Tech., Cambridge
OSTI Identifier:
6661315
Resource Type:
Journal Article
Journal Name:
J. Am. Chem. Soc.; (United States)
Additional Journal Information:
Journal Volume: 102:23
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; MOLYBDENUM SELENIDES; ELECTROCHEMISTRY; PHOTOCHEMISTRY; PHOTOELECTROCHEMICAL CELLS; EFFICIENCY; BROMINE; CHLORINE; ELECTRICITY; FERMI LEVEL; IODINE; SOLVENTS; VISIBLE RADIATION; CHALCOGENIDES; CHEMISTRY; ELECTROCHEMICAL CELLS; ELECTROMAGNETIC RADIATION; ELEMENTS; ENERGY LEVELS; EQUIPMENT; HALOGENS; MOLYBDENUM COMPOUNDS; NONMETALS; RADIATIONS; SELENIDES; SELENIUM COMPOUNDS; SOLAR EQUIPMENT; TRANSITION ELEMENT COMPOUNDS; 140505* - Solar Energy Conversion- Photochemical, Photobiological, & Thermochemical Conversion- (1980-); 400500 - Photochemistry

Citation Formats

Schneemeyer, L F, and Wrighton, M S. n-Type molybdenum diselenide-based photoelectrochemical cells: evidence for Fermi level pinning and comparison of the efficiency for conversion of light to electricity with various solvent/halogen/halide combinations. United States: N. p., 1980. Web. doi:10.1021/ja00543a010.
Schneemeyer, L F, & Wrighton, M S. n-Type molybdenum diselenide-based photoelectrochemical cells: evidence for Fermi level pinning and comparison of the efficiency for conversion of light to electricity with various solvent/halogen/halide combinations. United States. https://doi.org/10.1021/ja00543a010
Schneemeyer, L F, and Wrighton, M S. Wed . "n-Type molybdenum diselenide-based photoelectrochemical cells: evidence for Fermi level pinning and comparison of the efficiency for conversion of light to electricity with various solvent/halogen/halide combinations". United States. https://doi.org/10.1021/ja00543a010.
@article{osti_6661315,
title = {n-Type molybdenum diselenide-based photoelectrochemical cells: evidence for Fermi level pinning and comparison of the efficiency for conversion of light to electricity with various solvent/halogen/halide combinations},
author = {Schneemeyer, L F and Wrighton, M S},
abstractNote = {Interfacial energetics for n-type MoSe/sub 2/ (E/sub g/ = 1.4 eV, direct) and photoelectrochemical conversion of light to electrical energy in the presence of X/sub n//sup -//X/sup -/ (X = Cl, Br, I) have been characterized in CH/sub 3/CN electrolyte solution. Cyclic voltammetry for a set of reversible (at Pt electrodes) redox couples whose formal potential, E/sup 0/, spans a range -0.8 to +1.5 V vs CES has been employed to establish the interface energetics of MoSe/sub 2/. The extent to which the photoanodic current peak is more negative than at Pt is a measure of the output photovoltage for a given couple. Conversion of greater than or equal to E/sub g/ light to electricity can be sustained in CH/sub 3/CN solutions of X/sub n//sup -//X/sup -/ (X = Cl, Br, I) with an efficiency that is ordered Cl > Br > I where n-type MoSe/sub 2/ is used as a stable photoanode. In aqueous solution n-type MoSe/sub 2/ is not a stable anode in the presence of similar concentrations of Br/sub 2//Br/sup -/ or Cl/sub 2//Cl/sup -/, showing an important role for solvent in thermodynamics for electrode decomposition. In CH/sub 3/CN, efficiency for conversion of 632.8-nm light to electricity has been found to be up to 7.5% for Cl/sub 2//Cl/sup -/, 1.4% for Br/sub 2//Br/sup -/, and 0.14% for I/sub 3//sup -//I/sup -/. Differences among those redox systems are output voltage and short-circuit current, accounting for the changes in efficiency. In H/sub 2/O, I/sub 3//sup -//I/sup -/ yields a stable n-type MoSe/sub 2/-based photoelectrochemical cell with an efficiency for 632.8-nm light a little lower than that for the CH/sub 3/CN/Cl/sub 2//Cl/sup -/ solvent/redox couple system. Data for MoS/sub 2/-based cells in the CH/sub 3/CN/X/sub n//sup -//X/sup -/ solvent/redox couple systems show that the efficiency again depends on X: Cl > Br > I. In H/sub 2/O/I/sub 3//sup -//I/sup -/ an efficiency a little lower than that for the CH/sub 3/CN/Cl/sub 2//Cl/sup -/ is obtained. MoSe/sub 2/-based cells are somewhat more efficient than MoS/sub 2/-based cells, but significant variations in efficiency are found depending on the electrode sample used. 5 figures, 4 tables.},
doi = {10.1021/ja00543a010},
url = {https://www.osti.gov/biblio/6661315}, journal = {J. Am. Chem. Soc.; (United States)},
number = ,
volume = 102:23,
place = {United States},
year = {1980},
month = {11}
}