Jump to main content
Jump to site search

Issue 6, 2011
Previous Article Next Article

Enhancement of La0.6Sr0.4Co0.2Fe0.8O3-δ durability and surface electrocatalytic activity by La0.85Sr0.15MnO3±δ investigated using a new test electrode platform

Author affiliations

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 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.

Graphical abstract: Enhancement of La0.6Sr0.4Co0.2Fe0.8O3-δ durability and surface electrocatalytic activity by La0.85Sr0.15MnO3±δ investigated using a new test electrode platform

Back to tab navigation

Supplementary files

Publication details

The article was received on 17 Feb 2011, accepted on 23 Mar 2011 and first published on 04 May 2011


Article type: Paper
DOI: 10.1039/C1EE01188J
Citation: Energy Environ. Sci., 2011,4, 2249-2258
  •   Request permissions

    Enhancement of La0.6Sr0.4Co0.2Fe0.8O3-δ durability and surface electrocatalytic activity by La0.85Sr0.15MnO3±δ investigated using a new test electrode platform

    M. E. Lynch, L. Yang, W. Qin, J. Choi, M. Liu, K. Blinn and M. Liu, Energy Environ. Sci., 2011, 4, 2249
    DOI: 10.1039/C1EE01188J

Search articles by author

Spotlight

Advertisements