A niobium and tantalum co-doped perovskite cathode for solid oxide fuel cells operating below 500 °C

Mengran Li, Mingwen Zhao, Feng Li, Wei Zhou (), Vanessa K. Peterson, Xiaoyong Xu, Zongping Shao, Ian Gentle and Zhonghua Zhu ()
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Mengran Li: School of Chemical Engineering, The University of Queensland
Mingwen Zhao: School of Physics and State Key Laboratory of Crystal Materials, Shandong University
Feng Li: School of Physics and State Key Laboratory of Crystal Materials, Shandong University
Wei Zhou: Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University
Vanessa K. Peterson: Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation
Xiaoyong Xu: School of Chemical Engineering, The University of Queensland
Zongping Shao: Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University
Ian Gentle: School of Chemistry and Molecular Biosciences, The University of Queensland
Zhonghua Zhu: School of Chemical Engineering, The University of Queensland

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract The slow activity of cathode materials is one of the most significant barriers to realizing the operation of solid oxide fuel cells below 500 °C. Here we report a niobium and tantalum co-substituted perovskite SrCo0.8Nb0.1Ta0.1O3−δ as a cathode, which exhibits high electroactivity. This cathode has an area-specific polarization resistance as low as ∼0.16 and ∼0.68 Ω cm2 in a symmetrical cell and peak power densities of 1.2 and 0.7 W cm−2 in a Gd0.1Ce0.9O1.95-based anode-supported fuel cell at 500 and 450 °C, respectively. The high performance is attributed to an optimal balance of oxygen vacancies, ionic mobility and surface electron transfer as promoted by the synergistic effects of the niobium and tantalum. This work also points to an effective strategy in the design of cathodes for low-temperature solid oxide fuel cells.

Date: 2017
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DOI: 10.1038/ncomms13990

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