To electrochemically control structural and transport properties of oxygen-deficient perovskite SrFeOy (2.5 ≦ y ≦ 3) (SFO) epitaxial films, we employed electric-field-effect transistor structures in which the proton-conducting solid electrolyte Nafion is used as a gate insulator. When a positive gate voltage (VGS) is applied and protons are injected toward the film channel layer, the SFO films are electrochemically reduced, leading to increases in the channel resistance. On the other hand, when a negative VGS is applied and protons are removed, the SFO films are oxidized, and as a result, the channel resistances decrease. In addition, we found that the electrochemically reduced SFO films accommodate protons, forming the proton-containing oxide HxSrFeO2.5 whose proton concentration is determined by elastic recoil detection analysis to be x ∼ 0.11. Our results indicate the usefulness of the proton-conducting solid electrolyte for electrochemically controlling transition metal oxides and for exploring proton-containing oxides.
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28 February 2022
Research Article|
March 01 2022
Electrochemical control and protonation of the strontium iron oxide SrFeOy by using proton-conducting electrolyte
Yosuke Isoda
;
Yosuke Isoda
1
Institute for Chemical Research, Kyoto University
, Uji, Kyoto 611-0011, Japan
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Daisuke Kan
;
Daisuke Kan
a)
1
Institute for Chemical Research, Kyoto University
, Uji, Kyoto 611-0011, Japan
a)Author to whom correspondence should be addressed: dkan@scl.kyoto-u.ac.jp
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Yumie Ogura;
Yumie Ogura
2
Department of Nuclear Engineering, Kyoto University
, Kyoto 615-8540, Japan
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Takuya Majima
;
Takuya Majima
2
Department of Nuclear Engineering, Kyoto University
, Kyoto 615-8540, Japan
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Takashi Tsuchiya;
Takashi Tsuchiya
3
International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS)
, Tsukuba, Ibaraki, Japan
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Yuichi Shimakawa
Yuichi Shimakawa
1
Institute for Chemical Research, Kyoto University
, Uji, Kyoto 611-0011, Japan
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a)Author to whom correspondence should be addressed: dkan@scl.kyoto-u.ac.jp
Appl. Phys. Lett. 120, 091601 (2022)
Article history
Received:
December 22 2021
Accepted:
February 17 2022
Citation
Yosuke Isoda, Daisuke Kan, Yumie Ogura, Takuya Majima, Takashi Tsuchiya, Yuichi Shimakawa; Electrochemical control and protonation of the strontium iron oxide SrFeOy by using proton-conducting electrolyte. Appl. Phys. Lett. 28 February 2022; 120 (9): 091601. https://doi.org/10.1063/5.0083209
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