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Fabrication and performance of a proton-conducting solid oxide fuel cell based on a thin BaZr0.8Y0.2O3−δ electrolyte membrane

✍ Scribed by Wenping Sun; Litao Yan; Zhen Shi; Zhiwen Zhu; Wei Liu

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
859 KB
Volume
195
Category
Article
ISSN
0378-7753

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✦ Synopsis

A dense BaZr 0.8 Y 0.2 O 3-ı (BZY) proton-conducting electrolyte membrane is successfully fabricated on a NiO-BaZr 0.1 Ce 0.7 Y 0.2 O 3-ı (NiO-BZCY) anode substrate by a co-pressing process after co-firing at 1400 • C. BZY powders are synthesized via a citric acid-nitrate gel combustion process after calcination at 1100 • C. The SEM results reveal that the BZY membrane is crack-free, very dense, and 20 m thick. A single cell with Sm 0.5 Sr 0.5 CoO 3-ı -Ce 0.8 Sm 0.2 O 2-ı (SSC-SDC) as the cathode is assembled and tested with wet hydrogen (2% H 2 O) as the fuel and static air as the oxidant. The open circuit voltages (OCVs) are 0.953, 0.987, 1.014, and 1.039 V at 700, 650, 600, and 550 • C, respectively. A maximum power density of 170 mW cm -2 is obtained at 700 • C. Resistances of the testing cell are investigated under open circuit conditions at different operating temperatures by impedance spectroscopy.

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