Multicomponent proton conducting ceramics of SiO2 - TiO 2 - ZrO2 - P2O5 - Bi 2O3 for an intermediate temperature fuel cell

Dongho Seo, Sangsun Park, Byeong Mu Lim, Yong Soo Cho, Yong Gun Shul

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Abstract

The multicomponent proton conducting ceramics SiO2-TiO 2- ZrO2-P2 O5 (STZP) and SiO 2-TiO2- ZrO2-P2 O 5-Bi2 O3 with three different compositions (STZPBi3, STZPBi10, and STZPBi15) were synthesized via a wet chemical route. These prepared materials showed good thermal stability up to around 900°C by TG/DTA analyses. Introduction of optimum quantity of bismuth as a sintering aid into the samples contributed to enhance the densification of microstructure, which is essential for the utilization of proton conducting ceramics in fuel cells operated at elevated temperature. The proton conductivity of STZP was 3.6 × 10-5 S/cm at 80°C and that of STZPBi10 was 4.6 × 10-3 S/cm at 180°C. The fuel cell performances using STZP and STZPBi10 were implemented at 80°C and up to 230°C, respectively. The maximum power density was 0.03 mW/ cm2 at 80°C for the STZP sample and 2.5 mW/ cm2 at 150°C for the STZPBi10 sample under wet hydrogen and dry oxygen. The reduction of CO poisoning on platinum catalyst was demonstrated in fuel cell operating at temperatures of 180°C, 200°C, and 230°C.

Original languageEnglish
Article number011012
JournalJournal of Fuel Cell Science and Technology
Volume8
Issue number1
DOIs
Publication statusPublished - 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Mechanics of Materials
  • Mechanical Engineering

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