Issue 34, 2020, Issue in Progress

Hydrogen absorption and desorption on Rh nanoparticles revealed by in situ dispersive X-ray absorption fine structure spectroscopy

Abstract

To unveil the origin of the hydrogen-storage properties of rhodium nanoparticles (Rh NPs), we investigated the dynamical structural change of Rh NPs using in situ dispersive X-ray absorption fine structure spectroscopy (XAFS). The variation of the Rh–Rh interatomic distance and Debye–Waller factor of Rh NPs with a size of 4.0 and 10.5 nm during hydrogen absorption and desorption suggested that they have a different mechanism for hydrogen absorption, which is that the hydrogen absorption on the inner site has a greater contribution than that on a surface for Rh 4.0 nm. In the case of Rh 10.5 nm, it is opposed to Rh 4.0 nm. This study demonstrates a powerful in situ XAFS method for observing small local structural changes of metal nanoparticles and its importance for understanding of the hydrogen-absorption properties of Rh NPs with an interesting hydrogenation mechanism.

Graphical abstract: Hydrogen absorption and desorption on Rh nanoparticles revealed by in situ dispersive X-ray absorption fine structure spectroscopy

Supplementary files

Article information

Article type
Paper
Submitted
14 Apr 2020
Accepted
14 May 2020
First published
26 May 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 19751-19758

Hydrogen absorption and desorption on Rh nanoparticles revealed by in situ dispersive X-ray absorption fine structure spectroscopy

C. Song, O. Seo, D. Matsumura, S. Hiroi, Y. Cui, J. Kim, Y. Chen, A. Tayal, K. Kusada, H. Kobayashi, H. Kitagawa and O. Sakata, RSC Adv., 2020, 10, 19751 DOI: 10.1039/D0RA03322G

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