Electrochemical Properties of Tubular SOFC Based on a Porous Ceramic Support Fabricated by Phase-Inversion Method

doi:10.1016/j.jmst.2016.03.002

J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (7): 681-686.DOI: 10.1016/j.jmst.2016.03.002

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Electrochemical Properties of Tubular SOFC Based on a Porous Ceramic Support Fabricated by Phase-Inversion Method

Zongying Han¹, Yuhao Wang¹, Zhibin Yang¹, Minfang Han^{1, 2, *}

1 Union Research Center of Fuel Cell, School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China; 2 State Key Laboratory of Power Systems, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

Received:2015-11-30 Revised:2015-12-23 Online:2016-07-10 Published:2016-10-10
Contact: Corresponding author. Ph.D.; Tel.: +86 10 62331098; Fax: +86 10 62331098. E-mail address: hanminfang@sina.com (M. Han).
Supported by:
The authors gratefully acknowledge the financial support from the National Basic Research Program of China (973 Program, No. 2012CB215404), the National Natural Science Foundation of China (Nos. 51261120378 and 51402355), Beijing Natural Science Foundation(No. 2154056) and Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP, No. 20130023120023).

Abstract

Abstract: In this work, a tubular ceramic-supported solid oxide fuel cell (SOFC) was successfully fabricated by a low cost and simple process involving phase-inversion, brush coating and co-sintering. Properties including sintering behavior, microstructure of the tubular support as well as the electrochemical properties of single cell were investigated. The results show that a porous tubular support with finger-like pores and macrovoids was obtained after phase-inversion process. The tubular support is proved to be gas-permeable after sintering at 1400?°C with shrinkage of about 34%. The maximum power density of single tubular SOFC is 100?mW/cm² and 122?mW/cm² at 850?°C when fed with wet methane and hydrogen, respectively. The current collection, thickness of electrolyte and gas permeability of tubular support should account for the large total resistance. The present tubular design could be expected to deliver a higher voltage for longer support with several segmented-in-series cell stacks.

Key words: Phase-inversion method, Ceramic support, Tubular solid oxide fuel cell, Segmented-in-series

Zongying Han, Yuhao Wang, Zhibin Yang, Minfang Han. Electrochemical Properties of Tubular SOFC Based on a Porous Ceramic Support Fabricated by Phase-Inversion Method[J]. J. Mater. Sci. Technol., 2016, 32(7): 681-686.

Figures/Tables 8

Schematic diagram of the preparation of ceramic tubular support (a), the prepared ceramic tubular support (b) and the schematic diagram of tubular ceramic-supported SOFC (c).

Diameter and sintering shrinkage of ceramic tubular support. The shrinkage is defined as the change of diameter in a certain temperature compared with the unsintered tubular support.

SEM images showing the surface microstructure of ceramic tubular support: (a) the outer surface before sintering; (b) the outer surface after sintering at 1400?°C; (c) the inner surface before sintering; (d) the inner surface after sintering at 1400?°C.

Cross-sectional SEM images showing microstructures of the tubular support: (a) before sintering; (b) close-up view of (a); (c) after sintering at 1400?°C; (d) close-up view of (c).

Cross-sectional micrograph of tubular ceramic-supported SOFCs.

I-V and I-P curves of single cell at different test temperature using wet hydrogen (a) and methane (b) as fuel at a flow rate of 50?mL/min.

Nyquist plots for the single cell under OCV conditions at different test temperature.

I-V and I-P curves of the two-cell-stack at 850?°C using wet hydrogen as fuel at a flow rate of 80?mL/min and ambient air as oxidant.

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Electrochemical Properties of Tubular SOFC Based on a Porous Ceramic Support Fabricated by Phase-Inversion Method

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