scholarly journals Potential Oscillations and S-Shaped Polarization Curve in the Continuous Electro-oxidation of CO on Platinum Single-crystal Electrodes

2001 ◽  
Vol 105 (35) ◽  
pp. 8381-8386 ◽  
Author(s):  
Marc T. M. Koper ◽  
Thomas J. Schmidt ◽  
Nenad M. Marković ◽  
Philip N. Ross
Keyword(s):  
Single Crystal ◽  
Polarization Curve ◽  
Oxidation Of Co ◽  
Potential Oscillations ◽  
Platinum Single Crystal ◽  
Electro Oxidation

Surface Structure Dependent Electro-oxidation of Dimethyl Ether on Platinum Single-Crystal Electrodes

2007 ◽  
Vol 111 (51) ◽  
pp. 18836-18838 ◽  
Author(s):  
Yujin Tong ◽  
Leilei Lu ◽  
Yi Zhang ◽  
Yunzhi Gao ◽  
Geping Yin ◽  
...  
Keyword(s):  
Single Crystal ◽  
Surface Structure ◽  
Dimethyl Ether ◽  
Platinum Single Crystal ◽  
Electro Oxidation

Oscillatory Electro-oxidation of Methanol on Platinum Single Crystal Electrodes

2016 ◽  
Vol 7 (4) ◽  
pp. 276-279 ◽  
Author(s):  
B. A. F. Previdello ◽  
P. S. Fernández ◽  
G. Tremiliosi-Filho ◽  
H. Varela
Keyword(s):  
Single Crystal ◽  
Oxidation Of Methanol ◽  
Platinum Single Crystal ◽  
Electro Oxidation

The Electro-Oxidation of CO at the Ru(0001) Single-Crystal Electrode Surface

2000 ◽  
Vol 104 (28) ◽  
pp. 6642-6652 ◽  
Author(s):  
W. F. Lin ◽  
P. A. Christensen ◽  
A. Hamnett ◽  
M. S. Zei ◽  
G. Ertl
Keyword(s):  
Single Crystal ◽  
Electrode Surface ◽  
Oxidation Of Co ◽  
Electro Oxidation ◽  
Single Crystal Electrode

Electro-oxidation of d-mannitol on platinum single crystal surfaces

2001 ◽  
Vol 46 (20-21) ◽  
pp. 3147-3155 ◽  
Author(s):  
A.J Silva ◽  
L Proença ◽  
M.I.S Lopes ◽  
I Fonseca ◽  
A Rodes ◽  
...  
Keyword(s):  
Single Crystal ◽  
Crystal Surfaces ◽  
Single Crystal Surfaces ◽  
Platinum Single Crystal ◽  
Electro Oxidation

scholarly journals Electro-Oxidation of CO Saturated in 0.1 M HClO4 on Basal and Stepped Pt Single-Crystal Electrodes at Room Temperature Accompanied by Surface Reconstruction

Surfaces ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 315-325 ◽  
Author(s):  
Kiyotaka Abe ◽  
Hiroyuki Uchida ◽  
Junji Inukai
Keyword(s):  
Single Crystal ◽  
Surface Reconstruction ◽  
Active Sites ◽  
Oxidation Of Co ◽  
Crystal Surfaces ◽  
Hydrogen Electrode ◽  
Single Crystal Surfaces ◽  
Onset Potential ◽  
Electro Oxidation ◽  
Deactivation Process

The electro-oxidation of CO on Pt surface is not only fundamentally important in electrochemistry, but also practically important in residential fuel cells for avoiding the poisoning of Pt catalysts by CO. We carried out cyclic voltammetry on Pt(111), (110), (100), (10 10 9), (10 9 8), (10 2 1), (432), and (431) single-crystal surfaces using a three compartment cell to understand the activity and durability towards the electro-oxidation of CO saturated in 0.1 M HClO4. During the potential cycles between 0.07 and 0.95 V vs. the reversible hydrogen electrode, the current for the electro-oxidation of CO at potentials lower than 0.5 V disappeared, accompanied by surface reconstruction. Among the electrodes, the Pt(100) electrode showed the lowest onset potential of 0.29 V, but the activity abruptly disappeared after one potential cycle; the active sites were extremely unstable. In order to investigate the processes of the deactivation, potential-step measurements were also conducted on Pt(111) in a CO-saturated solution. Repeated cycles of the formations of Pt oxides at a high potential and Pt carbonyl species at a low potential on the surface were proposed as the deactivation process.

Experiments on REM and SREM using a Tem/Stem Microscope with a Configurable Angle-Resolving Detector

1990 ◽  
Vol 48 (1) ◽  
pp. 338-339
Author(s):  
H. Banzhof ◽  
I. Daberkow
Keyword(s):  
Electron Microscopy ◽  
Single Crystal ◽  
Crystal Surface ◽  
High Energy ◽  
Contrast Effects ◽  
Atomic Steps ◽  
Single Crystal Surfaces ◽  
Platinum Single Crystal ◽  
Reflection Electron Microscopy ◽  
Beam Reflection

A Philips EM 420 electron microscope equipped with a field emission gun and an external STEM unit was used to compare images of single crystal surfaces taken by conventional reflection electron microscopy (REM) and scanning reflection electron microscopy (SREM). In addition an angle-resolving detector system developed by Daberkow and Herrmann was used to record SREM images with the detector shape adjusted to different details of the convergent beam reflection high energy electron diffraction (CBRHEED) pattern.Platinum single crystal spheres with smooth facets, prepared by melting a thin Pt wire in an oxyhydrogen flame, served as objects. Fig. 1 gives a conventional REM image of a (111)Pt single crystal surface, while Fig. 2 shows a SREM record of the same area. Both images were taken with the (555) reflection near the azimuth. A comparison shows that the contrast effects of atomic steps are similar for both techniques, although the depth of focus of the SREM image is reduced as a result of the large illuminating aperture. But differences are observed at the lengthened images of small depressions and protrusions formed by atomic steps, which give a symmetrical contrast profile in the REM image, while an asymmetric black-white contrast is observed in the SREM micrograph. Furthermore the irregular structures which may be seen in the middle of Fig. 2 are not visible in the REM image, although it was taken after the SREM record.

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