title: A niobium and tantalum co-doped perovskite cathode for solid oxide fuel cells operating below 500 °C.
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-δas a cathode, which exhibits high electroactivity. This cathode has an area-specific polarization resistance as low as ∼0.16 and ∼0.68 Ω cm2in a symmetrical cell and peak power densities of 1.2 and 0.7 W cm-2in 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.
authors.affiliation: School of Chemical Engineering, The University of Queensland, St Lucia, Queensland 4072, Australia.
authors.forename: Mengran
authors.initials: M
authors.lastname: Li
authors.affiliation: School of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, Shandong, China.
authors.forename: Mingwen
authors.initials: M
authors.lastname: Zhao
authors.affiliation: School of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, Shandong, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Li
authors.affiliation: Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing 210009, Jiangsu, China.
authors.forename: Wei
authors.identifier: 0000-0003-0322-095X
authors.initials: W
authors.lastname: Zhou
authors.affiliation: Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Lucas Heights, New South Wales 2234, Australia.
authors.forename: Vanessa K
authors.initials: VK
authors.lastname: Peterson
authors.affiliation: School of Chemical Engineering, The University of Queensland, St Lucia, Queensland 4072, Australia.
authors.forename: Xiaoyong
authors.initials: X
authors.lastname: Xu
authors.affiliation: Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing 210009, Jiangsu, China.
authors.forename: Zongping
authors.initials: Z
authors.lastname: Shao
authors.affiliation: School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia.
authors.forename: Ian
authors.initials: I
authors.lastname: Gentle
authors.affiliation: School of Chemical Engineering, The University of Queensland, St Lucia, Queensland 4072, Australia.
authors.forename: Zhonghua
authors.initials: Z
authors.lastname: Zhu