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Unlocking bulk and surface oxygen transport properties of mixed oxide-ion and electron conducting membranes with combined oxygen permeation cell and oxygen probe method

Journal Article · · Journal of Membrane Science
 [1];  [2]
  1. University of South Carolina, Columbia, SC (United States); University of South Carolina
  2. University of South Carolina, Columbia, SC (United States)

Surface exchange kinetics and bulk diffusion of oxygen are of paramount importance to the activity of oxygen electrocatalysis and performance of electrochemical devices such as fuel cell, metal-air batteries, and oxygen separation membranes. Conventional approaches to obtaining these transport properties are often limited to single property under a specific non-operation related condition. Here we use a combined oxygen permeation cell and oxygen probe methodology to simultaneously attain rates of oxygen surface exchange and bulk conductivity/chemical diffusivity of three representative mixed oxide-ion and electron conductors, namely SrCo0.9Ta0.1O3-δ (SCT), La0.6Sr0.4CoO3-δ (LSC) and La0.6Sr0.4FeO3-δ (LSF), operated under a steady-state oxygen flux. The results explicitly show that SCT exhibit the highest oxide-ion conductivity/chemical diffusivity, fastest rates of surface oxygen exchange kinetics, thus promising to be the best oxygen electrocatalyst. Here, we have also mapped out the distribution of oxygen chemical potential gradient across the membranes and applied B-transport number concept to illustrate the rate-limiting steps in the overall oxygen permeation process.

Research Organization:
University of South Carolina, Columbia, SC (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Hydrogen Fuel Cell Technologies Office (HFTO); National Science Foundation (NSF)
Grant/Contract Number:
EE0008842
OSTI ID:
2429504
Alternate ID(s):
OSTI ID: 1867896
Journal Information:
Journal of Membrane Science, Journal Name: Journal of Membrane Science Vol. 644; ISSN 0376-7388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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