Q-model of electrode reactions: altering force constants of intramolecular vibrations
Journal Article
·
· Physical Chemistry Chemical Physics. PCCP
- Arizona State Univ., Tempe, AZ (United States). Dept. of Physics and School of Molecular Sciences
- Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Chemistry
A theory of redox reactions involving electron transfer between a metal electrode and a molecule in solution is formulated in terms of two types of nuclear coordinates of the thermal bath: electrostatic polarization of the medium and local low-frequency vibrations. The polarization fluctuations follow Gaussian statistics. In contrast, the vibrational coordinate is allowed to change its force constant between two oxidation states of the reactant, which is projected onto non-Gaussian fluctuations of the reactant's electronic states. A closed-form analytical theory for the electrode redox reactions is formulated in terms of three reorganization energies: the reorganization energy for the electrostatic polarization of the medium and two internal (vibrational) reorganization energies for the reduced and oxidized states of the reactant. In conclusion, the theory predicts asymmetry between the cathodic and anodic branches of the electrode current driven by the corresponding difference in the vibrational force constants.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704; SC0015641
- OSTI ID:
- 1480972
- Alternate ID(s):
- OSTI ID: 1470573
- Report Number(s):
- BNL--209340-2018-JAAM
- Journal Information:
- Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 37 Vol. 20; ISSN 1463-9076; ISSN PPCPFQ
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Electrode redox reactions with polarizable molecules
Electrode Reactions in Slowly Relaxing Media
Journal Article
·
Mon Apr 16 20:00:00 EDT 2018
· Journal of Chemical Physics
·
OSTI ID:1540171
Electrode Reactions in Slowly Relaxing Media
Journal Article
·
Thu Nov 16 19:00:00 EST 2017
· Journal of Chemical Physics
·
OSTI ID:1407474