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Research Papers

# Analysis and Modeling of Novel Low-Temperature SOFC With a Co-Ionic Conducting Ceria-Based Composite Electrolyte

[+] Author and Article Information
Jianbing Huang

Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, P.R.C.; Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P.R.C.

Jinliang Yuan, Bengt Sundén

Department of Energy Sciences, Lund University, Lund SE-22100, Sweden

Zongqiang Mao

Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P.R.C.

J. Fuel Cell Sci. Technol 7(1), 011012 (Nov 05, 2009) (7 pages) doi:10.1115/1.2971173 History: Received May 15, 2007; Revised April 19, 2008; Published November 05, 2009; Online November 05, 2009

## Abstract

In recent years, ceria-based composites (CBCs) have been developed as electrolytes for low-temperature solid oxide fuel cells. These materials exhibit extremely high ionic conductivities at $400–600°C$. It has also been found that both oxide ion and proton can be conducted in the CBC electrolytes, which makes such co-ionic conducting fuel cell distinct from any other types of fuel cells. In this study, a model involving three charge carriers (oxide ion, proton, and electron) is developed to describe the fuel cell with CBC electrolytes. Various operating characteristics of the fuel cell with CBC electrolytes are investigated, compared to those of the fuel cell with doped ceria electrolytes. The results indicate that the CBC electrolyte behaves as a pure ionic conductor, the cell is more efficient, and a higher output is expected at low temperatures under the same pressure operation than that of the cell with doped ceria electrolytes.

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## Figures

Figure 1

Schematic representation of a SOFC with (a) a co-ionic conducting CBC electrolyte and (b) its equivalent circuit.

Figure 2

The effect of the water partial pressure at the anode on the open circuit voltage at 500–600°C

Figure 3

The effect of the water partial pressure at the cathode on the open circuit voltage at 500–600°C

Figure 4

The effect of the hydrogen partial pressure at the anode on the open circuit voltage at 500–600°C

Figure 5

(a) The effect of the water partial pressure at the anode on the current densities of various charge carriers and the power density for the CBC electrolyte fuel cell at 500–600°C. (b) The effect of the water partial pressure at the anode on the current densities of various charge carriers and the power density for the SDC electrolyte fuel cell at 500–600°C.

Figure 6

(a) The effect of the water partial pressure at the cathode on the current densities of various charge carriers and the power density for the CBC electrolyte fuel cell at 500–600°C. (b) The effect of the the water partial pressure at the cathode on the current densities of various charge carriers and the power density for the SDC electrolyte fuel cell at 500–600°C.

Figure 7

(a) The effect of the hydrogen partial pressure at the anode on the current densities of various charge carriers and the power density for the CBC electrolyte fuel cell at 500–600°C. (b) The effect of the hydrogen partial pressure at the anode on the current densities of various charge carriers and the power density for the SDC electrolyte fuel cell at 500–600°C.

Figure 8

(a) The effect of the water partial pressure at the anode on the efficiency and average ionic transference number for the CBC electrolyte fuel cell at 500–600°C. (b) The effect of the water partial pressure at the anode on the efficiency and average ionic transference number for the SDC electrolyte fuel cell at 500–600°C.

Figure 9

(a) The effect of the water partial pressure at the cathode on the efficiency and average ionic transference number for the CBC electrolyte fuel cell at 500–600°C. (b) The effect of the water partial pressure at the cathode on the efficiency and average ionic transference number for the SDC electrolyte fuel cell at 500–600°C.

Figure 10

(a) The effect of the hydrogen partial pressure at the anode on the efficiency and average ionic transference number for the CBC electrolyte fuel cell at 500–600°C. (b) The effect of the hydrogen partial pressure at the anode on the efficiency and average ionic transference number for the SDC electrolyte fuel cell at 500–600°C.

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