New Layered Proton-Conducting Oxides LixAl0.6Co0.4O2 and LixAl0.7Co0.3O2

Rong Lan, Shanwen Tao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Single-phase layered oxides with nominal composition LiAl0.6Co0.4O2 and LiAl0.7Co0.3O2 were synthesised and tested as electrolytes for H2/air fuel cells. The maximum current and power densities of 382mAcm-2 and 108mWcm-2, respectively, were achieved at 650°C when a 0.70mm-thick LiAl0.6Co0.4O2 pellet was used as the electrolyte. The ionic conductivity of LiAl0.7Co0.3O2 was 4.0×10-2Scm-1 at 725°C, which was derived from the series resistance of the impedance spectra of the H2/air fuel cells. For LiAl0.6Co0.4O2, the highest ionic conductivity was 7.7×10-2Scm-1, observed at 625°C. In the LiAl1-yCoyO2 series, the proton conductivity and working temperature of the materials are closely related to the composition. It is essential to integrate the multivalent element into the layered-oxide lattice to achieve high proton conductivity, as the proton conduction is a coherent effect between the reduction of the multivalent element, such as cobalt, and the insertion of protons.

Original languageEnglish
Pages (from-to)2098-2103
Number of pages6
JournalChemElectroChem
Volume1
Issue number12
DOIs
Publication statusPublished - 1 Dec 2014

Keywords

  • Conducting materials
  • Fuel cells
  • Layered oxides
  • Mixed-valent compounds
  • Proton conductivity

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