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Title: Estimating parameters from rotating ring disc electrode measurements

Abstract

Rotating ring disc electrode (RRDE) experiments are a classic tool for investigating kinetics of electrochemical reactions. Several standardized methods exist for extracting transport parameters and reaction rate constants using RRDE measurements. Here in this work, we compare some approximate solutions to the convective diffusion used popularly in the literature to a rigorous numerical solution of the Nernst-Planck equations coupled to the three dimensional flow problem. In light of these computational advancements, we explore design aspects of the RRDE that will help improve sensitivity of our parameter estimation procedure to experimental data. We use the oxygen reduction in acidic media involving three charge transfer reactions and a chemical reaction as an example, and identify ways to isolate reaction currents for the individual processes in order to accurately estimate the exchange current densities.

Authors:
 [1];  [2]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States). Transportation and Hydrogen Systems Center
  2. Univ. of South Carolina, Columbia, SC (United States). Dept. of Chemical Engineering
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1407467
Report Number(s):
NREL/JA-5400-68209
Journal ID: ISSN 1023-1935
Grant/Contract Number:
AC36-08GO28308
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Russian Journal of Electrochemistry
Additional Journal Information:
Journal Volume: 53; Journal Issue: 10; Journal ID: ISSN 1023-1935
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; rotating ring disc electrodes; hydrodynamics; simultaneous reactions; sensitivity analysis

Citation Formats

Santhanagopalan, Shriram, and White, Ralph E. Estimating parameters from rotating ring disc electrode measurements. United States: N. p., 2017. Web. doi:10.1134/S1023193517100111.
Santhanagopalan, Shriram, & White, Ralph E. Estimating parameters from rotating ring disc electrode measurements. United States. doi:10.1134/S1023193517100111.
Santhanagopalan, Shriram, and White, Ralph E. Sat . "Estimating parameters from rotating ring disc electrode measurements". United States. doi:10.1134/S1023193517100111.
@article{osti_1407467,
title = {Estimating parameters from rotating ring disc electrode measurements},
author = {Santhanagopalan, Shriram and White, Ralph E.},
abstractNote = {Rotating ring disc electrode (RRDE) experiments are a classic tool for investigating kinetics of electrochemical reactions. Several standardized methods exist for extracting transport parameters and reaction rate constants using RRDE measurements. Here in this work, we compare some approximate solutions to the convective diffusion used popularly in the literature to a rigorous numerical solution of the Nernst-Planck equations coupled to the three dimensional flow problem. In light of these computational advancements, we explore design aspects of the RRDE that will help improve sensitivity of our parameter estimation procedure to experimental data. We use the oxygen reduction in acidic media involving three charge transfer reactions and a chemical reaction as an example, and identify ways to isolate reaction currents for the individual processes in order to accurately estimate the exchange current densities.},
doi = {10.1134/S1023193517100111},
journal = {Russian Journal of Electrochemistry},
number = 10,
volume = 53,
place = {United States},
year = {Sat Oct 21 00:00:00 EDT 2017},
month = {Sat Oct 21 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on October 21, 2018
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