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Bismuth ferrite: an abnormal perovskite with electrochemical extraction of ions from A site

Abstract

Perovskite materials (ABX3) are significant for energy storage and conversion, and most of the electrochemical processes are currently known to link with the reaction from active B site. Here a novel electrochemical active reaction is observed from A site in the perovskite bismuth ferrite (BiFeO3) nanoparticles. With the bismuth ion extraction from A site, single phase BiFeO3 is found to convert into new phases, namely Bi2O3 and residual Bi-deficient BiFeO3, and these irreversible products undergo additional separate electrochemical processes in the subsequent cycles. Fundamental understanding suggests that the extracted Bi3+ ions play a dominant role in the electrochemical process via redox reactions of Bi3+ ⇌ Bi2+ ⇌ Bi0. Interestingly, such electrochemical reaction of A site could be also suppressed via hetero-atom doping at A site (yttrium ions), which well supports the mechanism of ion extraction. The perspectives for the novel mechanism in electrochemical energy storage are further discussed.

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Publication details

The article was received on 08 Mar 2019, accepted on 15 Apr 2019 and first published on 15 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA02569C
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Bismuth ferrite: an abnormal perovskite with electrochemical extraction of ions from A site

    C. Ma, Y. Chen, C. Zhu, Q. Chen, W. Song, S. Jiao, H. Chen and D. Fang, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA02569C

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