skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Enhancement of La 0.6Sr 0.4Co 0.2Fe 0.8O 3-δ Durability and Surface Electro-catalytic Activity by La 0.85Sr 0.15MnO 3-δ Investigated using a New Test Electrode Platform

Abstract

A carefully designed test cell platform with a new electrode structure is utilized to determine the intrinsic surface catalytic properties of an electrode. With this design, the electrocatalytic activity and stability of an La 0.6Sr 0.4Co 0.2Fe 0.8O 3-δ (LSCF) cathode is enhanced by a dense thin La 0.85Sr 0.15MnO 3±δ (LSM) coating, suggesting that an efficient electrode architecture has been demonstrated that can make effective use of desirable properties of two different materials: fast ionic and electronic transport in the backbone (LSCF) and facile surface kinetics on the thin-film coating (LSM). Theoretical analyses suggest that the enhanced electrocatalytic activity of LSM-coated LSCF is attributed possibly to surface activation under cathodic polarization due to the promotion of oxygen adsorption and/or dissociation by the surface layer and the dramatically increased oxygen vacancy population in the surface film. Further, the observed time-dependent activation over a few hundreds of hours and durability are likely associated with the formation of a favorable hybrid surface phase intermediate between LSM and LSCF. This efficient electrode architecture was successfully applied to the state-of-the-art LSCF-based cathodes by a simple solution infiltration process, achieving reduced interfacial resistance and improved stability under fuel cell operating conditions.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Georgia Inst. of Technology, Atlanta, GA (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC); Heterogeneous Functional Materials Center (HeteroFoaM)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1065090
DOE Contract Number:  
SC0001061
Resource Type:
Journal Article
Resource Relation:
Journal Name: Energy & Environmental Science; Journal Volume: 4; Journal Issue: 6; Related Information: HeteroFoaM partners with University of South Carolina (lead); University of California, Santa Barbara; University of Connecticut; Georgia Institute of Technology; Princeton University; Rochester Institute of Technology; Savannah River National Laboratory; University of South Carolina; University of Utah
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; catalysis (heterogeneous); energy storage (including batteries and capacitors); hydrogen and fuel cells; mechanical behavior; charge transport; membrane; carbon sequestration; materials and chemistry by design; synthesis (novel materials); synthesis (self-assembly); synthesis (scalable processing)

Citation Formats

Lynch, Matthew, Yang, Lei, Qin, Wentao, Choi, Jongjin, Liu, Mingfei, Blinn, Kevin, and Liu, Meilin. Enhancement of La0.6Sr0.4Co0.2Fe0.8O3-δ Durability and Surface Electro-catalytic Activity by La0.85Sr0.15MnO3-δ Investigated using a New Test Electrode Platform. United States: N. p., 2011. Web. doi:10.1039/c1ee01188j.
Lynch, Matthew, Yang, Lei, Qin, Wentao, Choi, Jongjin, Liu, Mingfei, Blinn, Kevin, & Liu, Meilin. Enhancement of La0.6Sr0.4Co0.2Fe0.8O3-δ Durability and Surface Electro-catalytic Activity by La0.85Sr0.15MnO3-δ Investigated using a New Test Electrode Platform. United States. doi:10.1039/c1ee01188j.
Lynch, Matthew, Yang, Lei, Qin, Wentao, Choi, Jongjin, Liu, Mingfei, Blinn, Kevin, and Liu, Meilin. Wed . "Enhancement of La0.6Sr0.4Co0.2Fe0.8O3-δ Durability and Surface Electro-catalytic Activity by La0.85Sr0.15MnO3-δ Investigated using a New Test Electrode Platform". United States. doi:10.1039/c1ee01188j.
@article{osti_1065090,
title = {Enhancement of La0.6Sr0.4Co0.2Fe0.8O3-δ Durability and Surface Electro-catalytic Activity by La0.85Sr0.15MnO3-δ Investigated using a New Test Electrode Platform},
author = {Lynch, Matthew and Yang, Lei and Qin, Wentao and Choi, Jongjin and Liu, Mingfei and Blinn, Kevin and Liu, Meilin},
abstractNote = {A carefully designed test cell platform with a new electrode structure is utilized to determine the intrinsic surface catalytic properties of an electrode. With this design, the electrocatalytic activity and stability of an La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode is enhanced by a dense thin La0.85Sr0.15MnO3±δ (LSM) coating, suggesting that an efficient electrode architecture has been demonstrated that can make effective use of desirable properties of two different materials: fast ionic and electronic transport in the backbone (LSCF) and facile surface kinetics on the thin-film coating (LSM). Theoretical analyses suggest that the enhanced electrocatalytic activity of LSM-coated LSCF is attributed possibly to surface activation under cathodic polarization due to the promotion of oxygen adsorption and/or dissociation by the surface layer and the dramatically increased oxygen vacancy population in the surface film. Further, the observed time-dependent activation over a few hundreds of hours and durability are likely associated with the formation of a favorable hybrid surface phase intermediate between LSM and LSCF. This efficient electrode architecture was successfully applied to the state-of-the-art LSCF-based cathodes by a simple solution infiltration process, achieving reduced interfacial resistance and improved stability under fuel cell operating conditions.},
doi = {10.1039/c1ee01188j},
journal = {Energy & Environmental Science},
number = 6,
volume = 4,
place = {United States},
year = {Wed May 04 00:00:00 EDT 2011},
month = {Wed May 04 00:00:00 EDT 2011}
}