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Growth of Gold Dendritic Nanoforests on Titanium Nitride-coated Silicon Substrates

Growth of Gold Dendritic Nanoforests on Titanium Nitride-coated Silicon Substrates

Published on: June 3, 2019

Classical strong metal-support interactions between gold nanoparticles and titanium dioxide.

Hailian Tang^1,2,3, Yang Su¹, Bingsen Zhang⁴

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

Science Advances

|October 19, 2017

Summary

Strong metal-support interaction (SMSI) enhances gold catalyst stability. This study demonstrates classical SMSI in Au/TiO2, improving performance and unlocking new stable metal catalyst development.

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Area of Science:

Catalysis
Materials Science
Surface Chemistry

Background:

Supported metal catalysts are crucial for industry but suffer from poor stability.
Strong metal-support interaction (SMSI) is a known method to improve catalyst properties.
Classical SMSI was previously thought not to apply to gold catalysts.

Purpose of the Study:

To investigate the possibility of classical SMSI in gold catalysts.
To demonstrate enhanced stability and reactivity of gold catalysts under SMSI conditions.
To explore the general applicability of SMSI to other Group IB metals and reducible oxide supports.

Main Methods:

High-temperature reduction and oxidation treatments of Au/TiO2 catalysts.
Characterization using CO adsorption and electron transfer measurements.
Testing catalytic stability and performance in CO oxidation reactions.

Main Results:

Classical SMSI was successfully demonstrated for Au/TiO2, involving reversible gold encapsulation by a TiO2 overlayer.
The SMSI state significantly improved the stability of Au/TiO2 catalysts during CO oxidation.
SMSI was also observed for other Group IB metals (Cu, Ag) on titania and for Au on Fe3O4 and CeO2 supports.

Conclusions:

Classical SMSI is achievable for gold catalysts, contrary to previous assumptions.
SMSI provides a pathway to develop highly stable and active Group IB metal catalysts.
This finding has broad implications for the design of robust industrial catalysts.