Effects of Oxide Platforms on the Dynamics and Reduction Characteristics of Hydrogen Spillover

Abstract

The characteristics of hydrogen spillover on various metal oxides, involving the concurrent diffusion of protons (H+) and electrons (e-), were systematically studied by combining in situ analytical techniques with kinetic analyses. H2-temperature programmed reduction and in situ X-ray absorption fine structure data showed that hydrogen spillover from Pt onto TiO2 and WO3 greatly decreased the temperatures at which Zn2+ ions deposited on these remote metal oxides were reduced. In contrast, hydrogen spillover on MgO and CeO2 did not significantly affect the reduction of remote Zn2+. Mechanisms explaining the effects of spilled hydrogen on reduction for each oxide substrate were proposed based on the dynamic behaviors of H+ and e- as ascertained by means of in situ spectroscopic characterizations and kinetic analyses. The results of this work indicate that e- diffusion rather than H+ diffusion promotes the reduction of deposited metal ions and that interparticle hydrogen spillover can be facilitated over TiO2 and WO3 as a consequence of the interfacial diffusion of H+ and e- pairs. These findings provide an improved understanding of the hydrogen spillover phenomenon.

Supplementary files

Article information

Article type
Paper
Submitted
05 Aug 2024
Accepted
04 Nov 2024
First published
05 Nov 2024

Phys. Chem. Chem. Phys., 2024, Accepted Manuscript

Effects of Oxide Platforms on the Dynamics and Reduction Characteristics of Hydrogen Spillover

K. Shun, A. Fujimoto, K. Mori and H. Yamashita, Phys. Chem. Chem. Phys., 2024, Accepted Manuscript , DOI: 10.1039/D4CP03093A

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