TY - JOUR
T1 - High valence states of Pd supported on ferroelectric BaTiO3driven by electric polarization
AU - Yoshida, Tasuku
AU - Kano, Jun
AU - Mizumaki, Masaichiro
AU - Tamenori, Yusuke
AU - Nitta, Kiyofumi
AU - Kato, Kazuo
AU - Hinokuma, Satoshi
AU - Oshime, Norihiro
AU - Hirose, Satoshi
AU - Mikami, Hitoshi
AU - Ikeda, Naoshi
AU - Fujii, Tatsuo
AU - Nishina, Yuta
AU - Okubo, Tomoko
N1 - Funding Information:
The authors would like to thank Dr. Hirosawa (Japan Synchrotron Radiation Research Institute) and Professor N. Nakajima (Hiroshima University) for comments on the manuscript and Dr. H. Hashimoto and Mr. D. Fukutomi (Okayama University) for STEM observation. This work was partly supported by the JSPS Grant-in-Aid for Challenging Exploratory Research (Grant No. 24654089) and JST, PRESTO (No. JPMJPR13C4). The synchrotron radiation experiments were performed at the BL01B1 and BL27SU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2014B1516, 2015A1373, and 2015A1567).
Publisher Copyright:
© 2021 Author(s).
PY - 2021/8/30
Y1 - 2021/8/30
N2 - At a metal-ferroelectric junction, it has been considered that the electric polarization of the ferroelectric material can affect the electronic structure of the neighboring metal. Here, we demonstrate that the valence state of Pd can be shifted to the unstable high value of 4+ by the electric field of electric polarization in ferroelectric BaTiO3. Study of the absorption fine structure of both hard and soft x rays revealed the existence of Pd4+ states on the surface of Pd oxide nanoparticles. The positions of Pd and oxygen atoms are shifted in opposite directions by the electric field due to the electric polarization of ferroelectric BaTiO3. The atomic displacement of Pd and O forms a zigzag structure, in which the coordination number of Pd atoms is changed from four to six, producing a quadrivalent state. This report presents experimental evidence that ferroelectric polarization can control the electronic states of neighboring metal atoms, and we suggest that using the ferroelectric support effect may produce a new type of catalyst.
AB - At a metal-ferroelectric junction, it has been considered that the electric polarization of the ferroelectric material can affect the electronic structure of the neighboring metal. Here, we demonstrate that the valence state of Pd can be shifted to the unstable high value of 4+ by the electric field of electric polarization in ferroelectric BaTiO3. Study of the absorption fine structure of both hard and soft x rays revealed the existence of Pd4+ states on the surface of Pd oxide nanoparticles. The positions of Pd and oxygen atoms are shifted in opposite directions by the electric field due to the electric polarization of ferroelectric BaTiO3. The atomic displacement of Pd and O forms a zigzag structure, in which the coordination number of Pd atoms is changed from four to six, producing a quadrivalent state. This report presents experimental evidence that ferroelectric polarization can control the electronic states of neighboring metal atoms, and we suggest that using the ferroelectric support effect may produce a new type of catalyst.
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U2 - 10.1063/5.0066289
DO - 10.1063/5.0066289
M3 - Article
AN - SCOPUS:85114373744
SN - 0003-6951
VL - 119
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 9
M1 - 092904
ER -