Cobalt-free SrFe<inf>0.9</inf>Ti<inf>0.1</inf>O<inf>3-d</inf> as a high-performance electrode material for oxygen reduction reaction on doped ceria electrolyte with favorable CO<inf>2</inf> tolerance
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© 2015 Elsevier Ltd. A cobalt-free titanium-doped SrFeO<inf>3-d</inf> perovskite with a nominal composition of SrFe<inf>0.9</inf>Ti<inf>0.1</inf>O<inf>3-d</inf> (SFT) is exploited as an alternative electrode for solid oxide fuel cells (SOFCs). Special attention is given to the effects of CO<inf>2</inf> on the oxygen reduction reaction (ORR) performance and properties of the oxide. For this investigation, XRD, HR-TEM, FT-IR, 4-probe DC conductivity, EIS and SEM are used. Although no bulk carbonate is formed, even under a pure CO<inf>2</inf> atmosphere, the chemical adsorption of CO<inf>2</inf> only appears over the SFT surface, which suggests a weak effect of CO<inf>2</inf> on the structure of SFT. The EIS tests demonstrate that such CO<inf>2</inf> adsorption does have a modest and detrimental effect on the ORR over the SFT electrode. However, the electrochemical performance can be easily recovered after removing of CO<inf>2</inf>. Thus, SrFe<inf>0.9</inf>Ti<inf>0.1</inf>O<inf>3-d</inf> is a promising cathode material for practical SOFCs due to its high activity, high CO<inf>2</inf> tolerance, and low cost.
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