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Catalytic and Mechanistic Investigation of Polyaniline Supported PtO2Nanoparticles: A Combinedin situ/operandoEPR, DRIFTS, and EXAFS Study

Klasovsky, Florian ; Hohmeyer, Jens ; Brückner, Angelika ; Bonifer, Marcus ; Arras, Jürgen ; Steffan, Martin ; Lucas, Martin ; Radnik, Jörg ; Roth, Christina ; Claus, Peter (2008):
Catalytic and Mechanistic Investigation of Polyaniline Supported PtO2Nanoparticles: A Combinedin situ/operandoEPR, DRIFTS, and EXAFS Study.
In: The Journal of Physical Chemistry C, 112 (49), pp. 19555-19559. ACS Publications, ISSN 1932-7447,
[Article]

Abstract

Compounds containing electrically conducting macromolecules bear interesting properties as functional materials in various fields. As for catalytic applications, however, principles are scarcely, if at all, understood. Here we describe a systematic investigation of the relationship between the structure of a new type of conducting polymer supported metal catalyst and the catalystʼs oxidation activity. We have found that nanoclusters of unusual β-PtO2 (d = (1.9 ± 0.5) nm) could be deposited on polyaniline, and the resulting catalyst exhibits exceptionally low light-off temperatures in carbon monoxide oxidation even in the presence of other environmental pollutants. Characterizing the working state of the active catalyst by combining in situ/operando techniques (EPR, DRIFTS, and EXAFS), we visualized a distinctly increased charge carrier density within the support. Our results suggest that the intensive contact between an electron-conducting polymer support and up-grown nanoparticles affords a charge exchange between redox centers, thereby boosting catalytic activity dramatically.

Item Type: Article
Erschienen: 2008
Creators: Klasovsky, Florian ; Hohmeyer, Jens ; Brückner, Angelika ; Bonifer, Marcus ; Arras, Jürgen ; Steffan, Martin ; Lucas, Martin ; Radnik, Jörg ; Roth, Christina ; Claus, Peter
Title: Catalytic and Mechanistic Investigation of Polyaniline Supported PtO2Nanoparticles: A Combinedin situ/operandoEPR, DRIFTS, and EXAFS Study
Language: English
Abstract:

Compounds containing electrically conducting macromolecules bear interesting properties as functional materials in various fields. As for catalytic applications, however, principles are scarcely, if at all, understood. Here we describe a systematic investigation of the relationship between the structure of a new type of conducting polymer supported metal catalyst and the catalystʼs oxidation activity. We have found that nanoclusters of unusual β-PtO2 (d = (1.9 ± 0.5) nm) could be deposited on polyaniline, and the resulting catalyst exhibits exceptionally low light-off temperatures in carbon monoxide oxidation even in the presence of other environmental pollutants. Characterizing the working state of the active catalyst by combining in situ/operando techniques (EPR, DRIFTS, and EXAFS), we visualized a distinctly increased charge carrier density within the support. Our results suggest that the intensive contact between an electron-conducting polymer support and up-grown nanoparticles affords a charge exchange between redox centers, thereby boosting catalytic activity dramatically.

Journal or Publication Title: The Journal of Physical Chemistry C
Journal volume: 112
Number: 49
Publisher: ACS Publications
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Erneuerbare Energien
07 Department of Chemistry
07 Department of Chemistry > Fachgebiet Technische Chemie
07 Department of Chemistry > Fachgebiet Technische Chemie > Technische Chemie I
Date Deposited: 22 Feb 2013 08:47
Official URL: http://dx.doi.org/10.1021/jp805970e
Identification Number: doi:10.1021/jp805970e
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