Microstructural Insights into Dual-Phase Infiltrated Solid Oxide Fuel Cell Electrodes

Yanxiang Zhang, Changrong Xia, Yanxiang Zhang, Meng Ni, Meng Ni

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)

Abstract

3D microstructure of solid oxide fuel cell (SOFC) electrodes by a dual-phase infiltration procedure is constructed numerically from a phenomenological standpoint. The present work studies such a dual-phase infiltration procedure, from generation of backbone matrix to infiltration of backbone phase nanoparticles, followed by infiltration of electrocatalytic nanoparticles. Important geometric properties are calculated under various electrocatalytic nanoparticle loadings, including total and percolated surface areas and percolation probability of electrocatalytic nanoparticles, and total and percolated three-phase boundary (TPB) lengths. The effects of backbone nanoparticles, including infiltration loading, particle size and aggregation risk are studied systematically. One important finding is that the infiltration of backbone nanoparticles increases TPB length but shows negligible influence on the surface area of electrocatalytic nanoparticles. It demonstrates that the dual-phase infiltration has little advantage to reduce electrode resistance compared to the catalyst-phase infiltration when electrode reaction is limited to catalytic surface. However, the different influences of dual-phase infiltration on TPB length and surface area of electrocatalytic nanoparticles offers a potential strategy to identify electrode reaction mechanisms.
Original languageEnglish
Pages (from-to)F834-F839
JournalJournal of the Electrochemical Society
Volume160
Issue number8
DOIs
Publication statusPublished - 1 Jan 2013

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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