Nanostructured platinum-on-carbon model electrocatalysts prepared by colloidal lithography

Gustavsson, Martin; Fredriksson, Hans; Kasemo, Bengt Herbert; Jusys, Z.; Kaiser, Jörg; Jun, Chul Ho; Behm, R. Jürgen

doi:10.1016/j.jelechem.2004.01.031

Cited by 57 publications

(82 citation statements)

References 41 publications

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“…[19,[41][42][43][44][45] employing CL. The polished (alumina paste down to 0.3 mm grain size) GC substrates (disk diameter 9 mm, Sigradur G from Hochtemperatur Werkstoffe GmbH), were cleaned by immersion in 5 m KOH, rinsing with Millipore MilliQ water, subsequent immersion in concentrated H 2 SO 4 solution and again rinsing with Millipore MilliQ water, before they were dried in a N 2 stream.…”

Section: Methodsmentioning

confidence: 99%

“…However, pronounced mass transport effects on the reaction selectivity were demonstrated recently for electrocatalytic reactions over nanostructured Pt electrodes [15][16][17][18] deposited onto a planar glassy carbon substrate by employing colloidal lithography techniques. [19,20] On these surfaces, mass transport effects can be assessed in model studies where the reactant delivery to the patterned surface and off-transport of the reaction intermediates/products are varied in a controlled way, thus affecting both reaction activity and selectivity, as probed for several electrocatalytic reactions. [15][16][17][18] Complementary galvanostatic formaldehyde oxidation measurements on these patterned catalysts are the topics herein.…”

Section: Introductionmentioning

confidence: 99%

“…[19,44,48] Before applying constant current the working electrode was rested for several minutes at zero current. Then the current was stepped from I init = 0 mA (t init = 10 s) to I mid = 50 mA (t mid = 180 s) and back to zero current.…”

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confidence: 99%

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Oscillatory behaviour in Galvanostatic Formaldehyde Oxidation on Nanostructured Pt/Glassy Carbon Model Electrodes

et al. 2010

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The electrocatalytic oxidation of formaldehyde, which results in CO(2) and HCOOH formation, was investigated under galvanostatic conditions on nanostructured Pt/glassy carbon (GC) electrodes fabricated by employing colloidal lithography (CL). The measurements were performed on structurally well-defined model electrodes of different Pt surface coverages under different applied currents (current densities) and at constant electrolyte transport in a thin-layer flow cell connected to a differential electrochemical mass spectrometry (DEMS) setup to monitor the dynamic response of the reaction selectivity under these conditions. Periodic oscillations of the electrode potential and the CO(2) formation rate appear not only for a continuous Pt film, but also for the nanostructured Pt/GC electrodes when a critical current density is exceeded. The critical current density for achieving regular oscillation patterns increased with decreasing Pt nanodisk density. Lower oscillation frequencies of the electrode potential and lower CO(2) formation rate for nanostructured Pt/GC electrodes compared to continuous Pt film at similar applied current densities suggest that transport processes play an essential role. Moreover, from the simple periodic response of the nanostructured electrodes it follows that all individual Pt disks in the array oscillate in synchrony. This result is discussed in terms of the different modes of spatial coupling present in the system: global coupling, migration coupling and mass transport of the essential chemical species, and the coverage of corresponding adsorbates.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oscillatory behaviour in Galvanostatic Formaldehyde Oxidation on Nanostructured Pt/Glassy Carbon Model Electrodes

et al. 2010

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“…Currently, some efforts are made to develop preparation methods, aiming at a simultaneous control over particle size and distance. One possibility is the deposition of colloidal metal particles or colloidal lithography 59 . The individual position of each particle can be controlled by the preparation via electron beam lithography 60 .…”

Section: On the Development Of Model Catalystsmentioning

confidence: 99%

Model studies in heterogeneous catalysis at the microscopic level: from the structure and composition of surfaces to reaction kinetics

et al. 2006

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Heterogeneous catalysis is one of the fields of modern technology, in which a characterization of structural and chemical properties of solid surfaces at the microscopic level is of enormous importance. For a long time, such insights have been precluded by the complexity of most catalytically active materials. Recently, substantial progress has been made, however, toward a microscopic-level understanding of complex catalyst surfaces. We discuss the driving factors for these advancements, which are based on the development of new well-defined model systems as well as on advances in experimental technology and theory. Scrutinizing the example of planar model catalysts, we identify the process of linking structural and chemical information to microscopic reaction kinetics as a particular challenging aspect of today's work. We review the kinetic effects which may have an influence on the reaction kinetics on complex surfaces. As an example how structural and kinetic information can be correlated at the microscopic level we discuss the case of surface oxidation and oxygen induced restructuring of Pd nanoparticles as studied by molecular beam methods.

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“…chapter 6). Secondly, the particle layer itself may be employed as mask during the deposition of metals to generate arrays of nanoparticles with diverse types of shapes (Hulteen & van Duyne 1995;Burmeister, Schäfle et al 1998;Hulteen, Treichel et al 1999;Jensen, Schatz et al 1999;Jensen, Malinsky et al 2000;Traci R. Jensen 2000;Haynes & van Duyne 2001;He, Yao et al 2001;Bullen & Garrett 2002;Gustavsson, Fredriksson et al 2004;Kosiorek, Kandulski et al 2004;Ormonde, Hicks et al 2004;Shemaiah M. Weekes 2004;Yang, Jang et al 2006). Size and shape of these nanoparticles govern their optical properties.…”

mentioning

confidence: 99%

Micro- and Nanopatterning of Surfaces Employing Self Assembly of Nanoparticles and Its Application in Biotechnology and Biomedical Engineering

Burkhardt¹,

Fuchsberger²,

Nisch³

et al. 2010

Lithography

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Nanostructured platinum-on-carbon model electrocatalysts prepared by colloidal lithography

Cited by 57 publications

References 41 publications

Oscillatory behaviour in Galvanostatic Formaldehyde Oxidation on Nanostructured Pt/Glassy Carbon Model Electrodes

Oscillatory behaviour in Galvanostatic Formaldehyde Oxidation on Nanostructured Pt/Glassy Carbon Model Electrodes

Model studies in heterogeneous catalysis at the microscopic level: from the structure and composition of surfaces to reaction kinetics

Micro- and Nanopatterning of Surfaces Employing Self Assembly of Nanoparticles and Its Application in Biotechnology and Biomedical Engineering

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