Amorphous iron oxide decorated 3D heterostructured electrode for highly efficient oxygen reduction

Zhou, Wei, Ge, Lei, Chen, Zhi-Gang, Liang, Fengli, Xu, Hong-Yi, Motuzas, Julius, Julbe, Anne and Zhu, Zhonghua (2011) Amorphous iron oxide decorated 3D heterostructured electrode for highly efficient oxygen reduction. Chemistry of Materials, 23 18: 4193-4198.


Author Zhou, Wei
Ge, Lei
Chen, Zhi-Gang
Liang, Fengli
Xu, Hong-Yi
Motuzas, Julius
Julbe, Anne
Zhu, Zhonghua
Title Amorphous iron oxide decorated 3D heterostructured electrode for highly efficient oxygen reduction
Journal name Chemistry of Materials   Check publisher's open access policy
ISSN 0897-4756
1520-5002
Publication date 2011-09
Sub-type Article (original research)
DOI 10.1021/cm201439d
Volume 23
Issue 18
Start page 4193
End page 4198
Total pages 6
Place of publication Washington, DC, U.S.A.
Publisher American Chemical Society
Collection year 2012
Language eng
Formatted abstract Low-temperature reduction of oxygen with high efficiency is required for widespread application of electrochemical devices. Noble metal catalysts are favored for use as the surface modifier on ceramic electrodes to enhance their oxygen reduction reactivity. However, the disadvantages of noble metals, such as sintering and high price, restrict their practical applications. Here, we present a 5-nm-thick amorphous iron oxide thin film decorated electrode possessing not only high electrocatalytic activity comparable to that of the platinum (Pt) modified one but also improved stability. The iron oxide is deposited into porous perovskite SrSc0.2Co0.8O3−δ (SSC) by chemical vapor deposition (CVD), forming a three-dimensional (3D) heterostructured electrode using ferrocene as the precursor. The importance of CVD is not only ensuring the uniform distribution of iron oxide but also allowing the iron oxide to be amorphous. At 700 °C, the area specific resistance (ASR) of the 3D heterostructured cathode is reduced to 0.01 Ω cm2, which is only 50% of that of the unmodified one, and the derived single fuel cell achieves higher power delivery. The electrode operates stably at 650 °C for 250 h without any degradation, while the performance of Pt modified SSC starts to degrade only after 30 min. These results suggest that amorphous iron oxide can be used as the catalyst to improve oxygen reduction reaction (ORR), with the benefits of long-lifetime and low cost.
Keyword Electrochemistry
Fuel cells
Perovskite
Heterostructure
Amorphous iron oxide
Fuel-cell cathode
Thin-films
Performance
Perovskite
Site
SOFC
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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