Temperature- and Pressure-Dependent Hydrogen Concentration in Supported PdHx Nanoparticles by Pd K-Edge X-ray Absorption Spectroscopy

被引：78

作者：

Bugaev, Aram L. ^{[1
]}

Guda, Alexander A. ^{[1
]}

Lomachenko, Kirill A. ^{[1
,2
,3
,4
]}

Srabionyan, Vasiliy V. ^{[1
]}

Bugaev, Lusegen A. ^{[1
]}

Soldatov, Alexander V. ^{[1
]}

Lamberti, Carlo ^{[1
,2
,3
,4
]}

Dmitriev, Vladimir P. ^{[5
]}

van Bokhoven, Jeroen A. ^{[6
,7
]}

机构：

[1] Southern Fed Univ, Rostov Na Donu 344090, Russia

[2] Univ Turin, NIS Ctr, Dept Chem, I-10125 Turin, Italy

[3] Univ Turin, CrisDI Ctr, Dept Chem, I-10125 Turin, Italy

[4] INSTM Reference Ctr, I-10125 Turin, Italy

[5] ESRF, SNBL, Polygone Sci Louis Neel, F-38000 Grenoble, France

[6] ETH, Inst Chem & Bioengn, CH-8093 Zurich, Switzerland

[7] Paul Scherrer Inst, Swiss Light Source, Lab Catalysis & Sustainable Chem LSK, Villigen, Switzerland

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2014年 / 118卷 / 19期

关键词：

SURFACE-PLASMON RESONANCE; FINE-STRUCTURE; IN-SITU; PALLADIUM NANOPARTICLES; GOLD NANOPARTICLES; PARTICLE-SIZE; L-3; EDGE; HYDRATION PROPERTIES; METAL NANOPARTICLES; MOLECULAR-DYNAMICS;

D O I：

10.1021/jp500734p

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Hydride formation in palladium nanoparticles was studied by Pd K-edge X-ray absorption spectroscopy in both the near-edge (XANES) and the extended (EXAFS) regions and by X-ray diffraction (XRD) both in situ as a function of temperature and hydrogen pressure. In contrast to EXAFS and XRD, which probe Pd-Pd interatomic distance changes, the direct effect of hydrogen concentration on the electronic palladium structure is observed in the intensities and the peak positions in the XANES region. By using theoretical simulations, we propose a simple analysis of hydrogen concentration based on the changes of relative peak amplitudes in the XANES region, which correlate with interatomic distance changes determined by both EXAFS and XRD. By the quantitative analysis of XANES difference spectra, we have developed a scheme to determine the hydrogen concentration in palladium nanoparticles without applying any additional calibration procedures with alternative experimental techniques.

引用

页码：10416 / 10423

页数：8

共 97 条

[1] Determination of the Particle Size, Available Surface Area, and Nature of Exposed Sites for Silica-Alumina-Supported Pd Nanoparticles: A Multitechnical Approach [J].