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Stabilizing Oxide Nanolayer via Interface Confinement and Surface Hydroxylation.

Dongqing Wang^1,2, Le Lin¹, Rankun Zhang^1,3

¹State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China.

The Journal of Physical Chemistry Letters

|July 14, 2022

Summary

This summary is machine-generated.

Surface hydroxylation enhances the stability and oxidation resistance of cobalt oxide nanoislands on platinum. This effect is due to stronger interfacial adhesion and interface confinement, crucial for catalytic processes.

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Area of Science:

Surface science
Catalysis
Materials science

Background:

Surface hydroxylation is common in catalytic reactions involving H2 and H2O.
Hydroxyl groups play a key role in reaction elementary steps.

Purpose of the Study:

To investigate the impact of surface hydroxylation on the stability of cobalt oxide overlayers on Pt(111).
To understand the role of hydroxyl groups in the oxidation resistance of cobalt oxide nanostructures.

Main Methods:

Utilized inverse model catalysts: monolayer CoO and CoOHx nanoislands on Pt(111).
Employed surface science experiments and theoretical calculations.

Main Results:

Hydroxyl groups on CoO nanoislands, formed via deuterium-spillover, improve oxidation resistance.
Theoretical calculations revealed a linear strengthening of CoO-Pt interfacial adhesion with increased hydroxylation.
Surface hydroxylation enhances the interface confinement effect between CoO and Pt.

Conclusions:

Surface hydroxylation significantly enhances the stability and oxidation resistance of Co oxide overlayers on Pt(111).
The enhanced stability is attributed to increased interfacial adhesion and interface confinement effects, involving reduced Co ions and stronger Co-Pt bonding.