TITLE

# Calculation of the oxygen potential profile across solid-state electrochemical cells

AUTHOR(S)
Singh, R.; Jacob, K. T.
PUB. DATE
July 2003
SOURCE
Journal of Applied Electrochemistry;Jul2003, Vol. 33 Issue 7, p571
SOURCE TYPE
DOC. TYPE
Article
ABSTRACT
Although several methods of solving the charge and mass transport equations in solid electrolytes wired for device applications have been reported in the literature, there are several inconsistencies. Yuan and Pal have expressed some misgivings regarding the earlier treatment of Choudhury and Patterson. The recent analysis by NÃ¤fe is at variance with the analysis of Yuan and Pal. This paper presents a critical examination of various methods for solving transport equations in solid-state electrochemical devices based on mixed ionic-electronic conductors. A complete equivalence between the approaches of Yuan and Pal and Choudhury and Patterson is demonstrated. The oxygen chemical potential profiles generated by both models are identical for a variety of boundary conditions and circuit parameters for a typical cell configuration. The concept of â€˜fictitious conductivityâ€™ introduced by NÃ¤fe is found to be inappropriate. It implies linear variation of the electrochemical potential of electrons inside the electrolyte, which is not generally valid for a mixed conductor. The oxygen chemical potential profiles inside the electrolyte calculated using NÃ¤fe's equation for different conditions differ substantially from those predicted by the other models. The flawed theoretical formulation is responsible for this mismatch. The methods of Choudhury and Patterson, Riess, and Yuan and Pal are essentially equivalent.
ACCESSION #
16781776

## Related Articles

• Solving current problems. Wilks, Neil // Professional Engineering;06/21/2000, Vol. 13 Issue 12, p27

Focuses on Regenesys, an electrochemical method that converts electrical energy to chemical energy. Use of two tanks of electrolyte solutions and a fuel cell in which the electrolytes are divided by an ion-selective membrane; Advantages offered by the Regenesys system. INSET: Ions in the soul:...

• Proton diffusion in ?-manganese dioxide. Browning, G.J.; Donne, S.W. // Journal of Applied Electrochemistry;Sep2005, Vol. 35 Issue 9, p871

Deconvolution of the electrolytic manganese dioxide (EMD) discharge curve has indicated the presence of a number of energetically different reduction processes. This has been used to determine the contribution of each reduction process to the total discharge. Using step potential electrochemical...

• Hydrogen fuel cells for cars and buses. Janssen, L. J. J. // Journal of Applied Electrochemistry;Nov2007, Vol. 37 Issue 11, p1383

The use of hydrogen fuel cells for cars is strongly promoted by the governments of many countries and by international organizations like the European Community. The electrochemical behaviour of the most promising fuel cell (polymer electrolyte membrane fuel cell, PEMFC) is critically discussed,...

• Photoinjection into electrolyte solutions. The role of thermalization. Rips, Ilya; Urbakh, M. I. // Journal of Chemical Physics;8/15/1991, Vol. 95 Issue 4, p2975

Photoinjection of low-energy electrons from a metal electrode into electrolyte solution is analyzed. Screening of the image potential during the emission and thermalization stages is neglected. Observed deviations from the Fowler law are associated with the energy dependence of the electron...

• Electrochemical behaviour of a new triiron-substituted polyoxomolybdate. Turdean, Graziella Liana; Patrut, Adrian; David, Leontin; Popescu, Ionel Catalin // Journal of Applied Electrochemistry;Jun2008, Vol. 38 Issue 6, p751

A new complex of the Keggin trilacunary $$A\alpha {\text{-PMo}}_{{\text{9}}} {\text{O}}^{{{\text{9}} - }}_{{{\text{34}}}}$$ polyoxomolybdate (PMo9) with Fe3+ ions, having the formula  A\alpha {\text{-PFe}}^{{{\text{III}}}} _{{\text{3}}} {\text{(H}}_{{\text{2}}} {\text{O)}}_{{\text{3}}}...

• Preparation and Investigation of a Novel Organic Polymer Consisting of 2,2,6,6-Tetramethylpiperidine-N-oxy as a Cathode Active Material in Li-Ion Batteries. Biçer, Emre; Öktemer, Atilla // International Journal of Electrochemistry;2013, p1

In the present study, a novel organic polymer consisting of 2,2,6,6-tetramethylpiperidine-N-oxyl group as an electroactive center is employed by synthesizing it from a commercially ready polymer. An investigation on electrochemical and battery properties of this material as a cathode active...

• Separation of organoselenium compounds and their electrochemical detection. Ochsenkuhn-Petropoulou, Maria Th.; Tsopelas, Fotios N. // Analytical & Bioanalytical Chemistry;Jul2004, Vol. 379 Issue 5/6, p770

A simplified procedure based on ion-exchange separation of selenourea (Se-U) and selenocystamine (Se-CM), which have very close half-wave potential when they are simultaneously analyzed by voltammetric techniques, has been developed and optimized. Thus, selenocystamine remains in the cation...

• Effect of temperature on nickel electrodeposition from a nickel sulfamate electrolyte. Saitou, M.; Oshiro, S.; Asadul Hossain, S. M. // Journal of Applied Electrochemistry;Mar2008, Vol. 38 Issue 3, p309

The effect of temperature on nickel electrodeposition from a nickel sulfamate electrolyte has been investigated. All the experimental points in a plot of nickel film thickness vs. current density collapse onto a single straight line irrespective of deposition temperature. A relation derived from...

• Electrolyte optimization for a Li ion battery by charge profile analysis. Minwhan Cha; Cheolsoo Jung // Journal of Applied Electrochemistry;Jul2009, Vol. 39 Issue 7, p955

Electrolyte design for Li ion batteries was approached by means of comparison of faradaic and non-faradaic currents. The faradaic current by the movement of Li+ ions was dependent on the composition of the electrolyte and was related to the battery capacity; the higher the capacity, the greater...

Share