A high performance intermediate temperature fuel cell based on a thick oxide-carbonate electrolyte

Lei Zhang, Rong Lan, Xiaoxiang Xu, Shanwen Tao, Yinzhu Jiang, Arno Kraft

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

A high performance intermediate temperature fuel cell (ITFC) with composite electrolyte composed of codoped ceria Ce0.8Gd0.05Y0.15O1.9 (GYDC) and a binary carbonate-based (52 mol% Li2CO3/48 mol% Na2CO3), 1.2 mm thick electrolyte layer has been developed. Co-doped Ce0.8Gd0.05Y0.15O1.9 was synthesized by a glycine-nitrate process and used as solid support matrix for the composite electrolyte. The conductivity of both composite electrolyte and GYDC supporting substrate were measured by AC impedance spectroscopy. It showed a sharp conductivity jump at about 500 degrees C when the carbonates melted. Single cells with thick electrolyte layer were fabricated by a dry-pressing technique using NiO as anode and Ba0.5Sr0.5Co0.8Fe0.2O3-delta or lithiated NiO as cathode. The cell was tested at 450-550 degrees C using hydrogen as the fuel and air as the oxidant. Excellent performance with high power density of 670 mW cm(-2) at 550 degrees C was achieved fora 1.2 mm thick composite electrolyte containing 40 wt% carbonates which is much higher than that of a cell based on pure GYDC with a 70 mu m thick electrolyte layer.

Original languageEnglish
Pages (from-to)967-971
Number of pages5
JournalJournal of Power Sources
Volume194
Issue number2
DOIs
Publication statusPublished - 1 Dec 2009

Keywords

  • intermediate temperature
  • fuel cell
  • co-doped ceria
  • composite electrolyte
  • electrical properties
  • proton conduction
  • doped ceria
  • stability
  • fabrication
  • ceramics
  • defects
  • anode

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