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Issue 24, 2016
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Robust nano-architectured composite thin films for a low-temperature solid oxide fuel cell cathode

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Abstract

Thin-film based, low temperature solid oxide fuel cells (LT-SOFCs) have gained much attention due to their capability to reduce the operating temperature (<450 °C) and the ensuing extended life and reduced cost, compared to conventional SOFCs. While highly porous and continuously connected Pt thin films are viewed as an attractive cathode, they are readily apt to sinter and grow into larger, isolated crystallites upon annealing, leading to severe degradation of the cathode performance over time. Here, we address this issue by fabricating a post-encapsulated composite structure, in which gas-permeable and catalytically active solid electrolytes surround porous Pt electrodes. Nanoporous Pt thin films deposited onto a yttria-stabilized ZrO2 (YSZ) single-crystal substrate are uniformly coated with Sm-doped CeO2 (SDC) via a simple, cost-effective and scalable coating method known as cathodic electrochemical deposition (CELD). Physical characterization of the nanostructured Pt/SDC composite thin films is done using a range of tools, in this case SEM, TEM, XRD and ICP-MS. AC impedance spectroscopy (ACIS) of symmetric cells (cathode|electrolyte|cathode) with SDC coatings reveals that the enhanced Pt–SDC interactions led to exceptionally high ORR activity and outstanding thermal stability. These observations provide new directions for the achievement of a robust and catalytically active LT-SOFC cathode through modification of the metal surface.

Graphical abstract: Robust nano-architectured composite thin films for a low-temperature solid oxide fuel cell cathode

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Publication details

The article was received on 04 Jan 2016, accepted on 06 Apr 2016 and first published on 07 Apr 2016


Article type: Paper
DOI: 10.1039/C6TA00052E
J. Mater. Chem. A, 2016,4, 9394-9402
  • Open access: Creative Commons BY license
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    Robust nano-architectured composite thin films for a low-temperature solid oxide fuel cell cathode

    H. G. Seo, Y. Choi, B. Koo, A. Jang and W. Jung, J. Mater. Chem. A, 2016, 4, 9394
    DOI: 10.1039/C6TA00052E

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