Electrochemical control and protonation of the strontium iron oxide SrFeOy by using proton-conducting electrolyte

Author:

Isoda Yosuke1ORCID,Kan Daisuke1ORCID,Ogura Yumie2,Majima Takuya2ORCID,Tsuchiya Takashi3,Shimakawa Yuichi1ORCID

Affiliation:

1. Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan

2. Department of Nuclear Engineering, Kyoto University, Kyoto 615-8540, Japan

3. International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki, Japan

Abstract

To electrochemically control structural and transport properties of oxygen-deficient perovskite SrFeO y (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 H xSrFeO2.5 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.

Funder

Ministry of Education, Culture, Sports, Science and Technology

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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