Solvent influence on non-adiabatic interfacial electron transfer at conductive oxide electrolyte interfaces
Abstract
The kinetics for interfacial electron transfer (ET) from a transparent conductive oxide (tin-doped indium oxide, ITO, Sn:In2O3) to molecular acceptors 4-[N,N-di(p-tolyl)amino]benzylphosphonic acid, TPA, and [RuII(bpy)2(4,4' -(PO3H2)2-bpy)]2+, RuP, positioned at variable distances within and beyond the electric double layer (EDL), were quantified in benzonitrile and methanol by nanosecond absorption spectroscopy as a function of the thermodynamic driving force, -ΔG ° . Relevant ET parameters such as the rate constant, ket, reorganization energy, λ, and electronic coupling, Hab, were extracted from the kinetic data. Overall, ket increased as the distance between the molecular acceptor and the conductor decreased. For redox active molecules within the Helmholtz planes of the EDL, ket was nearly independent of -ΔG° , consistent with a negligibly small λ value. Rips–Jortner analysis revealed a non-adiabatic electron transfer mechanism consistent with Hab < 1 cm-1 . The data indicate that the barrier for electron transfer is greatly diminished at the conductor–electrolyte interface.
- Authors:
-
- Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry
- Publication Date:
- Research Org.:
- University of North Carolina, Chapel Hill, NC (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1850681
- Alternate Identifier(s):
- OSTI ID: 1669164
- Grant/Contract Number:
- SC0001011; DGE-1650116
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 153; Journal Issue: 13; Journal ID: ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Chemistry; physics; reaction rate constants; electronic coupling; thin films; dielectric properties; chemical compounds; transfer reaction; s electrolytes; absorption spectroscopy; electrochemistry; electron transfer theory
Citation Formats
Aramburu-Trošelj, Bruno M., Bangle, Rachel E., and Meyer, Gerald J. Solvent influence on non-adiabatic interfacial electron transfer at conductive oxide electrolyte interfaces. United States: N. p., 2020.
Web. doi:10.1063/5.0023766.
Aramburu-Trošelj, Bruno M., Bangle, Rachel E., & Meyer, Gerald J. Solvent influence on non-adiabatic interfacial electron transfer at conductive oxide electrolyte interfaces. United States. https://doi.org/10.1063/5.0023766
Aramburu-Trošelj, Bruno M., Bangle, Rachel E., and Meyer, Gerald J. Thu .
"Solvent influence on non-adiabatic interfacial electron transfer at conductive oxide electrolyte interfaces". United States. https://doi.org/10.1063/5.0023766. https://www.osti.gov/servlets/purl/1850681.
@article{osti_1850681,
title = {Solvent influence on non-adiabatic interfacial electron transfer at conductive oxide electrolyte interfaces},
author = {Aramburu-Trošelj, Bruno M. and Bangle, Rachel E. and Meyer, Gerald J.},
abstractNote = {The kinetics for interfacial electron transfer (ET) from a transparent conductive oxide (tin-doped indium oxide, ITO, Sn:In2O3) to molecular acceptors 4-[N,N-di(p-tolyl)amino]benzylphosphonic acid, TPA, and [RuII(bpy)2(4,4' -(PO3H2)2-bpy)]2+, RuP, positioned at variable distances within and beyond the electric double layer (EDL), were quantified in benzonitrile and methanol by nanosecond absorption spectroscopy as a function of the thermodynamic driving force, -ΔG ° . Relevant ET parameters such as the rate constant, ket, reorganization energy, λ, and electronic coupling, Hab, were extracted from the kinetic data. Overall, ket increased as the distance between the molecular acceptor and the conductor decreased. For redox active molecules within the Helmholtz planes of the EDL, ket was nearly independent of -ΔG° , consistent with a negligibly small λ value. Rips–Jortner analysis revealed a non-adiabatic electron transfer mechanism consistent with Hab < 1 cm-1 . The data indicate that the barrier for electron transfer is greatly diminished at the conductor–electrolyte interface.},
doi = {10.1063/5.0023766},
journal = {Journal of Chemical Physics},
number = 13,
volume = 153,
place = {United States},
year = {Thu Oct 01 00:00:00 EDT 2020},
month = {Thu Oct 01 00:00:00 EDT 2020}
}
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