The Influence of Platinum Surface Morphology on the Electrooxidation of Methanol in Alkaline Solutions

2019 ◽  
Vol 13 (23) ◽  
pp. 41-54 ◽  
Author(s):  
Joel R. Hayes ◽  
Daniel Zeller ◽  
Cody Friesen
Keyword(s):  
Surface Morphology ◽  
Alkaline Solutions ◽  
Platinum Surface ◽  
Electrooxidation Of Methanol

scholarly journals Influence of surface morphology on methanol oxidation at a glassy carbon-supported pt catalyst

2008 ◽  
Vol 73 (8-9) ◽  
pp. 845-859 ◽  
Author(s):  
S. Stevanovic ◽  
D. Tripkovic ◽  
A. Kowal ◽  
D. Minic ◽  
V.M. Jovanovic ◽  
...  
Keyword(s):  
Particle Size ◽  
Surface Morphology ◽  
Methanol Oxidation ◽  
Glassy Carbon ◽  
Active Sites ◽  
Spherical Particles ◽  
Pt Catalyst ◽  
Alkaline Solutions ◽  
Real Surface ◽  
Step Method

Platinum supported on glassy carbon (GC) was used as a model system for studying the influence of the surface morphology of a Pt catalyst on methanol oxidation in alkaline and acidic solutions. Platinum was deposited by the potential step method on GC samples from H2SO4 + H2PtCl6 solution under the same conditions with loadings from 10 to 80 mg cm-2. AFM and STM images of the GC/Pt electrodes showed that the Pt was deposited in the form of 3D agglomerates composed of spherical particles. Longer deposition times resulted in increased growth of Pt forms and a decrease in the specific area of the Pt. The real surface area of Pt increased with loading but the changes were almost negligible at higher loadings. Nevertheless, both the specific and mass activity of platinum supported on glassy carbon for methanol oxidation in acidic and in alkaline solutions exhibit a volcanic dependence with respect to the platinum loading. The increase in the activity can be explained by the increasing the particle size with the loading and thus an increase in the contiguous Pt sites available for adsorption and decomposition of methanol. However, the decrease in the activity of the catalyst with further increase of loading and particle size after reaching the maximum is related to the decrease of active sites available for methanol adsorption and their accessibility as a result of more close proximity and pronounced coalescence of the Pt particles.

Anodic Treatment of Zn-Ni Alloy in Alkaline Solutions

2015 ◽  
Vol 227 ◽  
pp. 139-142 ◽  
Author(s):  
Artur Maciej ◽  
Joanna Michalska ◽  
Wojciech Simka ◽  
Maciej Sowa ◽  
Tadeusz Gorewoda ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Sodium Hydroxide ◽  
Sodium Silicate ◽  
Main Part ◽  
Alloy Coating ◽  
Alkaline Solutions ◽  
Anodic Treatment ◽  
Corrosion Studies ◽  
Alkali Solutions ◽  
Ni Alloy

The investigations on anodic oxidation of galvanic Zn-Ni alloy coating in the baths containing sodium hydroxide, sodium silicate and ammonium pentaborate was described in this paper. The surface morphology studies (SEM) and corrosion characterization was the main part of the work. It was found that the anodic treatment of the Zn-Ni alloy coating in the alkali solutions basis on NaOH permit to the obtaining the oxide layer with cracks formation. Application of the baths containing also sodium silicate and ammonium pentaborate cause the cracks decay. The corrosion studies may indicate that the cracks are shallow.

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