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Title: Water Formation Reaction under Interfacial Confinement: Al0.25Si0.75O2 on O-Ru(0001)

Journal Article · · Nanomaterials
DOI:https://doi.org/10.3390/nano12020183· OSTI ID:1839116

Confined nanosized spaces at the interface between a metal and a seemingly inert material, such as a silicate, have recently been shown to influence the chemistry at the metal surface. In prior work, we observed that a bilayer (BL) silica on Ru(0001) can change the reaction pathway of the water formation reaction (WFR) near room temperature when compared to the bare metal. In this work, we looked at the effect of doping the silicate with Al, resulting in a stoichiometry of Al0.25Si0.75O2. We investigated the kinetics of WFR at elevated H2 pressures and various temperatures under interfacial confinement using ambient pressure X-ray photoelectron spectroscopy. The apparent activation energy was lower than that on bare Ru(0001) but higher than that on the BL-silica/Ru(0001). The apparent reaction order with respect to H2 was also determined. The increased residence time of water at the surface, resulting from the presence of the BL-aluminosilicate (and its subsequent electrostatic stabilization), favors the so-called disproportionation reaction pathway (*H2O + *O ↔ 2 *OH), but with a higher energy barrier than for pure BL-silica.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Spanish Ministry of Science, Innovation and Universities
Grant/Contract Number:
SC0012704; AC02-05CH11231; BES-2015-075748; 61059-ND5
OSTI ID:
1839116
Alternate ID(s):
OSTI ID: 1844589
Report Number(s):
BNL-222718-2022-JAAM; NANOKO; PII: nano12020183
Journal Information:
Nanomaterials, Journal Name: Nanomaterials Vol. 12 Journal Issue: 2; ISSN 2079-4991
Publisher:
MDPI AGCopyright Statement
Country of Publication:
Switzerland
Language:
English

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