Characterisation of the strong metal-support interaction (SMSI) in electrocatalysis
Characterisation of the strong metal-support interaction (SMSI) in electrocatalysis
The term SMSI comes from an effect observed in gas/solid heterogeneous catalysis. When a Pt group metal is deposited on a reducible oxide and is reduced under hydrogen at temperatures higher than 450 degrees Celsius the chemisorption properties of the catalyst are altered. Several theories to explain this effect in gas/solid heterogeneous catalysis have been proposed and it is now generally accepted that the effect occurs due to a site blocking of the Pt particles by reduced support layers. A similar effect has been reported in electrocatalysis and it is this effect that is investigated in this work.
Electrochemical measurements were carried out to investigate the SMSMI effect in electrocatalysis and to discover whether TinO2n-1 supported catalysts could be used as alternative catalysts for fuel cells. Cyclic voltammetry showed that when reducing the Pt particles via the hydrogen reduction method at high temperatures the catalyst exhibits SMSI behaviour. When carrying out the polarisation studies the catalysts also showed activities for the reactions which depended on the preparation method and pre-treatment conditions.
Investigations to characterise the effect were carried out using spectroscopic techniques to probe the effect on both the Pt particles (examined by EXAFS, XANES, and TEM) and on the nature of the support (investigated by Raman, XRD, and XAS).
University of Southampton
Carrette, Linda Petra Lea
1998
Carrette, Linda Petra Lea
Carrette, Linda Petra Lea
(1998)
Characterisation of the strong metal-support interaction (SMSI) in electrocatalysis.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The term SMSI comes from an effect observed in gas/solid heterogeneous catalysis. When a Pt group metal is deposited on a reducible oxide and is reduced under hydrogen at temperatures higher than 450 degrees Celsius the chemisorption properties of the catalyst are altered. Several theories to explain this effect in gas/solid heterogeneous catalysis have been proposed and it is now generally accepted that the effect occurs due to a site blocking of the Pt particles by reduced support layers. A similar effect has been reported in electrocatalysis and it is this effect that is investigated in this work.
Electrochemical measurements were carried out to investigate the SMSMI effect in electrocatalysis and to discover whether TinO2n-1 supported catalysts could be used as alternative catalysts for fuel cells. Cyclic voltammetry showed that when reducing the Pt particles via the hydrogen reduction method at high temperatures the catalyst exhibits SMSI behaviour. When carrying out the polarisation studies the catalysts also showed activities for the reactions which depended on the preparation method and pre-treatment conditions.
Investigations to characterise the effect were carried out using spectroscopic techniques to probe the effect on both the Pt particles (examined by EXAFS, XANES, and TEM) and on the nature of the support (investigated by Raman, XRD, and XAS).
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Published date: 1998
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Local EPrints ID: 463678
URI: http://eprints.soton.ac.uk/id/eprint/463678
PURE UUID: cffdc96f-115a-4795-aab4-06006222d76f
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Date deposited: 04 Jul 2022 20:55
Last modified: 04 Jul 2022 20:55
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Author:
Linda Petra Lea Carrette
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