High valence states of Pd supported on ferroelectric BaTiO3 driven by electric polarization

被引：1

作者：

Yoshida, Tasuku ^{[1
]}

Kano, Jun ^{[1
,2
]}

Mizumaki, Masaichiro ^{[3
]}

Tamenori, Yusuke ^{[3
]}

Nitta, Kiyofumi ^{[3
]}

Kato, Kazuo ^{[3
]}

Hinokuma, Satoshi ^{[2
,4
]}

Oshime, Norihiro ^{[1
]}

Hirose, Satoshi ^{[5
]}

Mikami, Hitoshi ^{[5
]}

Ikeda, Naoshi ^{[1
]}

Fujii, Tatsuo ^{[1
]}

Nishina, Yuta ^{[1
,2
,6
]}

Okubo, Tomoko ^{[1
]}

机构：

[1] Okayama Univ, Grad Sch Nat Sci & Technol, Kita Ku, 3-1-1 Tsushima Naka, Okayama 7008530, Japan

[2] Japan Sci & Technol Agcy, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 3320012, Japan

[3] Japan Synchrotron Radiat Res Inst, 1-1-1 Kouto, Sayo, Hyogo 6795198, Japan

[4] Natl Inst Adv Ind Sci & Technol, Interdisciplinary Res Ctr Catalyt Chem, Innovat Oxidat Team, Tsukuba, Ibaraki 3058565, Japan

[5] Honda Res & Dev Co Ltd, Mat Proc, Innovat Res Excellence, 4630 Shimotakanezawa, Haga, Tochigi 3213393, Japan

[6] Okayama Univ, Res Core Interdisciplinary Sci, Kita Ku, 3-1-1 Tsushima Naka, Okayama 7008530, Japan

来源：

APPLIED PHYSICS LETTERS | 2021年 / 119卷 / 09期

基金：

日本科学技术振兴机构; 日本学术振兴会;

关键词：

HYDROGEN-STORAGE; ALLOY; METAL; OXIDE; NANOPARTICLES; PALLADIUM; CATALYSIS; ELEMENTS; SURFACE; CARBON;

D O I：

10.1063/5.0066289

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

页数：5

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