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Issue 21, 2017
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Enhanced oxygen-release/storage properties of Pd-loaded Sr3Fe2O7−δ

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Abstract

This study proves that a small amount of Pd loading (1 wt%) on Sr3Fe2O7−δ can dramatically enhance the oxygen-storage properties of Sr3Fe2O7−δ. The topotactic oxygen intake and release between Sr3Fe2O6.75 and Sr3Fe2O6 takes place in response to gas switching between an O2 flow and H2 flow, regardless of the presence or absence of Pd loading. The effect of Pd loading is significant for the oxygen-release process under H2 atmosphere; that is, highly dispersed Pd metal nanoparticles sized less than 1 nm formed on Pd/Sr3Fe2O7−δ to promote H2 dissociation, resulting in the improvement of the oxygen-release temperature and rate. Pd/Sr3Fe2O7−δ with a layered perovskite structure has a higher oxygen-release property at lower temperature than Pd/SrFeO3−δ with a perovskite phase without the layered structure. These facts indicate that the surface reaction as well as the crystal structure are responsible for the oxide ion mobility in perovskite structure, and also provide guidelines for designing novel oxygen-storage materials.

Graphical abstract: Enhanced oxygen-release/storage properties of Pd-loaded Sr3Fe2O7−δ

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Publication details

The article was received on 14 Mar 2017, accepted on 01 May 2017 and first published on 03 May 2017


Article type: Paper
DOI: 10.1039/C7CP01614J
Citation: Phys. Chem. Chem. Phys., 2017,19, 14107-14113
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    Enhanced oxygen-release/storage properties of Pd-loaded Sr3Fe2O7−δ

    K. Beppu, S. Hosokawa, T. Shibano, A. Demizu, K. Kato, K. Wada, H. Asakura, K. Teramura and T. Tanaka, Phys. Chem. Chem. Phys., 2017, 19, 14107
    DOI: 10.1039/C7CP01614J

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