NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Pressure dependence of the oxygen reduction reaction at the platinum microelectrode/nafion interface - Electrode kinetics and mass transportThe investigation of oxygen reduction kinetics at the platinum/Nafion interface is of great importance in the advancement of proton-exchange-membrane (PEM) fuel-cell technology. This study focuses on the dependence of the oxygen reduction kinetics on oxygen pressure. Conventional Tafel analysis of the data shows that the reaction order with respect to oxygen is unity at both high and low current densities. Chronoamperometric measurements of the transport parameters for oxygen in Nafion show that oxygen dissolution follows Henry's isotherm. The diffusion coefficient of oxygen is invariant with pressure; however, the diffusion coefficient for oxygen is lower when air is used as the equilibrating gas as compared to when oxygen is used for equilibration. These results are of value in understanding the influence of O2 partial pressure on the performance of PEM fuel cells and also in elucidating the mechanism of oxygen reduction at the platinum/Nafion interface.
Document ID
19930027453
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Parthasarathy, Arvind
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Srinivasan, Supramaniam
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Appleby, A. J.
(Texas A & M Univ. College Station, United States)
Martin, Charles R.
(Colorado State Univ. Fort Collins, United States)
Date Acquired
August 15, 2013
Publication Date
October 1, 1992
Publication Information
Publication: Electrochemical Society, Journal
Volume: 139
Issue: 10
ISSN: 0013-4651
Subject Category
Inorganic And Physical Chemistry
Accession Number
93A11450
Funding Number(s)
CONTRACT_GRANT: NAG3-1255
CONTRACT_GRANT: NAG9-342
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available