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Research Papers

Multicomponent Proton Conducting Ceramics of SiO2TiO2ZrO2P2O5Bi2O3 for an Intermediate Temperature Fuel Cell

[+] Author and Article Information
Dongho Seo, Sangsun Park, Byeong-Mu Lim

Department of Chemical Engineering, Yonsei University, 134 Shcinchon-dong, Seodaemun-gu, Seoul 120-749, Korea

Yong-Soo Cho

Department of Ceramic Engineering, Yonsei University, 134 Shcinchon-dong, Seodaemun-gu, Seoul 120-749, Korea

Yong-Gun Shul1

Department of Chemical Engineering, Yonsei University, 134 Shcinchon-dong, Seodaemun-gu, Seoul 120-749, Koreashulyg@yonsei.ac.kr

1

Corresponding author.

J. Fuel Cell Sci. Technol 8(1), 011012 (Nov 04, 2010) (5 pages) doi:10.1115/1.4002313 History: Received September 13, 2009; Revised July 14, 2010; Published November 04, 2010; Online November 04, 2010

The multicomponent proton conducting ceramics SiO2TiO2ZrO2P2O5 (STZP) and SiO2TiO2ZrO2P2O5Bi2O3 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 3.6×105S/cm at 80°C and that of STZPBi10 was 4.6×103S/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 0.03mW/cm2 at 80°C for the STZP sample and 2.5mW/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.

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Figures

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Figure 1

Preparation of multicomponent proton conducting ceramics by wet chemical reaction method

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Figure 2

Schematic representation of the electrolyte-supported single cell configuration

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Figure 3

TG/DTA curves of samples: (a) STZP and (b) STZPBi3

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Figure 4

SEM images of the samples: (a) STZP calcined at 1400°C, (b) STZPBi3 calcined at 1000°C, (c) STZPBi10 calcined at 1000°C, and (d) STZPBi15 calcined at 1000°C

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Figure 5

XRD patterns of the samples: (a) STZP calcined at 1400°C, (b) STZPBi3 calcined at 1000°C, (c) STZPBi10 calcined at 1000°C, and (d) STZPBi15 calcined at 1000°C

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Figure 6

Conductivity plots of the samples as function of inverse temperature. For electrochemical measurements, humidified H2 and dry O2 were supplied to the anode and the cathode (100 SCCM (SCCM denotes cubic centimeter per minute at STP)/100 SCCM).

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Figure 7

Performance curve of fuel cell using the STZP sample at 80°C. The cell was operating with humidified H2 and dry O2 (100 SCCM/100 SCCM). Pt loadings on both anode and cathode were 0.2 mg/cm2, respectively. The humidifier temperature held at 65°C.

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Figure 8

Performance curves of fuel cell using the STZPBi10 sample. The cell was operating with humidified H2 and dry O2 (100 SCCM/100 SCCM). Pt loadings on both anode and cathode were 0.2 mg/cm2, respectively. The humidifier temperature held at 65°C.

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Figure 9

Effect of CO gas on fuel cell performance using STZPBi10 sample at different temperatures: (a) 180°C, (b) 200°C, and (c) 230°C. The CO concentrations are indicated in the figures.

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