Enhancing the Electrocatalytic Activity of Redox Stable Perovskite Fuel Electrodes in Solid Oxide Cells by Atomic Layer-Deposited Pt Nanoparticles

Arunkumar Pandiyan, Valerio Di Palma, Vasileios Kyriakou (Corresponding author), Wilhelmus M.M. Kessels, Mariadriana Creatore, Mauritius C.M. Van De Sanden, Mihalis N. Tsampas (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The carbon dioxide and steam co-electrolysis in solid oxide cells offers an efficient way to store the intermittent renewable electricity in the form of syngas (CO + H2), which constitutes a key intermediate for the chemical industry. The co-electrolysis process, however, is challenging in terms of materials selection. The cell composites, and particularly the fuel electrode, are required to exhibit adequate stability in redox environments and coking that rules out the conventional Ni cermets. La0.75Sr0.25Cr0.5Mn0.5O3 (LSCrM) perovskite oxides represent a promising alternative solution, but with electrocatalytic activity inferior to the conventional Ni-based cermets. Here, we report on how the electrochemical properties of a state-of-the-art LSCrM electrode can be significantly enhanced by introducing uniformly distributed Pt nanoparticles (18 nm) on its surface via the atomic layer deposition (ALD). At 850 °C, Pt nanoparticle deposition resulted in a ∼62% increase of the syngas production rate during electrolysis mode (at 1.5 V), whereas the power output was improved by ∼84% at fuel cell mode. Our results exemplify how the powerful ALD approach can be employed to uniformly disperse small amounts (∼50 μg·cm-2) of highly active metals to boost the limited electrocatalytic properties of redox stable perovskite fuel electrodes with efficient material utilization.

Original languageEnglish
Pages (from-to)12646-12654
Number of pages9
JournalACS Sustainable Chemistry and Engineering
Volume8
Issue number33
DOIs
Publication statusPublished - 24 Aug 2020

Keywords

  • atomic layer deposition
  • COreduction
  • greenhouse gases
  • HO electrolysis
  • Pt catalyst
  • solid oxide cells
  • syngas production

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