Oxidation and reduction under cover: Chemistry at the confined space between ultra-thin nanoporous silicates and Ru(0001)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- National Synchrotron Light Source II, Upton, NY (United States)
- Univ. of Minnesota, Minneapolis, MN (United States)
The oxidation and reduction of Ru(0001) surfaces at the confined space between two-dimensional nanoporous silica frameworks and Ru(0001) have been investigated using synchrotron-based ambient pressure X-ray photoelectron spectroscopy (AP-XPS). The porous nature of the frameworks and the weak interaction between the silica and the ruthenium substrate allow oxygen and hydrogen molecules to go through the nanopores and react with the metal at the interface between the silica framework and the metal surface. In this work, three types of two-dimensional silica frameworks have been used to study their influence in the oxidation and reduction of the ruthenium surface at elevated pressures and temperatures. These frameworks are bilayer silica (0.5 nm thick), bilayer aluminosilicate (0.5 nm thick), and zeolite MFI nanosheets (3 nm thick). It is found that the silica frameworks stay essentially intact under these conditions, but they strongly affect the oxidation of ruthenium, with the 0.5 nm thick aluminosilicate bilayer completely inhibiting the oxidation. Furthermore, the latter is believed to be related to the lower chemisorbed oxygen content arising from electrostatic interactions between the negatively charged aluminosilicate framework and the Ru(0001) substrate.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Gas Separations Relevant to Clean Energy Technologies (CGS)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC00112704
- OSTI ID:
- 1245397
- Report Number(s):
- BNL-111991-2016-JA; KC0403020
- Journal Information:
- Journal of Physical Chemistry. C, Vol. 67, Issue 10; ISSN 1932-7447
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Ionization‐Facilitated Formation of 2D (Alumino)Silicate–Noble Gas Clathrate Compounds
|
journal | March 2019 |
X-ray Microscopy
|
book | January 2019 |
Synchrotron-based ambient pressure X-ray photoelectron spectroscopy of hydrogen and helium
|
journal | February 2018 |
Energy Level Shifts at the Silica/Ru(0001) Heterojunction Driven by Surface and Interface Dipoles
|
journal | September 2016 |
X-ray microscopy
|
journal | July 1965 |
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