Redox-Reversible Electrode Material for Direct Hydrocarbon Solid Oxide Fuel Cells

ACS Applied Materials & Interfaces
Peng QiuFanglin Chen

Abstract

Solid oxide fuel cells (SOFCs) can directly operate on hydrocarbon fuels such as natural gas; however, the widely used nickel-based anodes face grand challenges such as coking, sulfur poisoning, and redox instability. We report a novel double perovskite oxide Sr2Co0.4Fe1.2Mo0.4O6-δ (SCFM) that possesses excellent redox reversibility and can be used as both the cathode and the anode. When heat-treated at 900 °C in a reducing environment, double perovskite phase SCFM transforms into a composite of the Ruddlesden-Popper structured oxide Sr3Co0.1Fe1.3Mo0.6O7-δ (RP-SCFM) with the Co-Fe alloy nanoparticles homogeneously distributed on the surface of RP-SCFM. At 900 °C in an oxidizing atmosphere, the composite transforms back into the double perovskite phase SCFM. The excellent oxygen reduction reaction catalytic activity and mixed ionic-electronic conductivity make SCFM an excellent cathode material for SOFCs. When SCFM is used as the anode, excellent performance and stability are achieved upon either direct oxidation of methane as a fuel or operation with sulfur-containing fuels. The excellent redox reversibility coupled with outstanding electrical and catalytic properties manifested by SCFM will enable a broad application in energy...Continue Reading

References

Apr 15, 2003·Nature Materials·Shanwen Tao, John T S Irvine
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Apr 15, 2006·Science·Yun-Hui HuangJohn B Goodenough
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Apr 2, 2010·Journal of Nanoscience and Nanotechnology·Mukul Kumar, Yoshinori Ando
Oct 14, 2010·Advanced Materials·Qiang LiuFanglin Chen
Sep 12, 2015·Nature Communications·Dragos NeaguJohn T S Irvine
Jun 11, 2019·ACS Applied Materials & Interfaces·Weiwei FanYonghong Cheng
Oct 28, 2019·ACS Applied Materials & Interfaces·Yanhong WanChangrong Xia
Dec 18, 2019·ACS Applied Materials & Interfaces·Jun Hyuk KimMeilin Liu

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