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Evaluation of Ca3Co2O6 as cathode material for high-performance solid-oxide fuel cell.

Tao Wei¹, Yun-Hui Huang, Rui Zeng

¹State Key Laboratory of Material Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.

Scientific Reports

|January 26, 2013

Summary

A new cobalt-based compound, Ca(3)Co(2)O(6) (CCO), shows excellent performance as a cathode material for intermediate-temperature solid-oxide fuel cells (IT-SOFCs). Its thermal and mechanical properties are compatible with electrolytes, enabling high power density and thermoelectric voltage.

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Area of Science:

Materials Science
Electrochemistry
Energy Conversion

Background:

Intermediate-temperature solid-oxide fuel cells (IT-SOFCs) require advanced cathode materials for improved efficiency.
Cobalt-based oxides are explored for their potential in SOFC applications.

Purpose of the Study:

To develop and evaluate Ca(3)Co(2)O(6) (CCO) as a novel cathode material for IT-SOFCs.
To assess the electrochemical, thermal, and mechanical properties of CCO in relation to common IT-SOFC electrolytes.

Main Methods:

Synthesis and characterization of Ca(3)Co(2)O(6) (CCO).
Measurement of thermal expansion coefficient (TEC), thermal-stress (σ), and interfacial shearing stress (τ).
Electrochemical performance testing of CCO as a cathode in IT-SOFCs at 800°C.

Main Results:

CCO exhibits good thermal and mechanical compatibility with several IT-SOFC electrolytes.
A maximum power density of 1.47 W cm(-2) was achieved at 800°C.
An additional thermoelectric voltage of 11.7 mV was detected, indicating a thermoelectric effect.

Conclusions:

Ca(3)Co(2)O(6) (CCO) demonstrates superior electrochemical performance and a beneficial thermoelectric effect.
CCO is a promising cathode material for IT-SOFCs due to its performance and compatibility.
Further research into CCO could lead to advancements in SOFC technology.