scholarly journals Oxide electrocatalytic coatings obtained by the sol-gel procedure: Preparation and characterization

2002 ◽  
Vol 56 (5) ◽  
pp. 208-222
Author(s):  
Aleksandar Dekanski ◽  
Vladimir Panic ◽  
Branislav Nikolic
Keyword(s):  
Electrochemical Properties ◽  
Surface Area ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Scanning Tunneling ◽  
Active Surface Area ◽  
Real Surface ◽  
Corrosion Stability ◽  
Tio2 Particles ◽  
Real Surface Area

The influence of different parameters (forced hydrolysis duration in the preparation of sols, alcohol addition in the sol mixture for application, as well as sol/alcohol mixture ageing time) on the morphology and electrochemical properties of RuO2-TiO2 coatings obtained by the sol-gel procedure is presented. The oxide sols were sharacterized by spectroscopic and microscopic methods (X-ray diffraction, TEM, etc). The morphology of the obtained coatings was examined by scanning tunneling microscopy, while the electrochemical properties were investigated by cyclic voltammetry polarization measurements, electrochemical impedance spectroscopy and the accelerated stability test. The greatest real surface area was obtained for coatings with the smallest RuO2 particles and largest TiO2 particles. Alcohol addition caused enlargement of the oxide grains and, consequently, a decrease in the real surface area. The same effects of oxide grain size were registered on electrochemically active surface area. The electrocatalytic activity of the obtained anodes for the chlorine evolution reaction increased with growth of the TiO2 particles, but depended on the RuO2 particle size to a small degree. The corrosion stability of the anode coatings consisting of the smallest RuO2 particles and largest TiO2 particles whis the greatest in the electrolysis of a sodium-chloride solution.

Determination of the Real Surface Area of Palladium Electrode

2010 ◽  
Vol 23 (5) ◽  
pp. 543-548 ◽  
Author(s):  
Lan-lan Fang ◽  
Qian Tao ◽  
Ming-fang Li ◽  
Ling-wen Liao ◽  
Dong Chen ◽  
...  
Keyword(s):  
Surface Area ◽  
Real Surface ◽  
The Real ◽  
Palladium Electrode ◽  
Real Surface Area

Comparison of Electrochemical Properties of Ni+NiAl and Ni Coatings in an Alkaline Solution

2015 ◽  
Vol 228 ◽  
pp. 258-262 ◽  
Author(s):  
Magdalena Popczyk ◽  
Bożena Łosiewicz ◽  
A. Budniok
Keyword(s):  
Steady State ◽  
Electrochemical Impedance Spectroscopy ◽  
Room Temperature ◽  
Electrochemical Impedance ◽  
Nanocomposite Coatings ◽  
Intrinsic Activity ◽  
Real Surface ◽  
Galvanostatic Conditions ◽  
Area Development ◽  
Real Surface Area

The Ni+NiAl nanocomposite coatings were prepared by the electrodeposition under the galvanostatic conditions (jdep= -250 mA cm-2) from the nickel bath containing the suspension of NiAl nanopowder. For comparison, the Ni coatings were also obtained. The combined steady-state polarization and electrochemical impedance spectroscopy (EIS) investigations of hydrogen evolution reaction (HER) were carried out in 5 M KOH solution at room temperature. It was found that the Ni+NiAl nanocomposite coatings revealed higher apparent electrocataltic activity towards the HER as compared to the comparable Ni deposits due to the increase in the real surface area development and the intrinsic activity.

scholarly journals The effect of the composition of the dispersing medium of oxide sols on the electrocatalytic activity of sol-gel obtained RuO2-TiO2/Ti anodes

2001 ◽  
Vol 66 (11-12) ◽  
pp. 847-857 ◽  
Author(s):  
Dejan Mitrovic ◽  
Vladimir Panic ◽  
Aleksandar Dekanski ◽  
Slobodan Milonjic ◽  
Radoslav Atanasoski ◽  
...  
Keyword(s):  
Surface Area ◽  
Electrocatalytic Activity ◽  
Sol Gel ◽  
Active Surface ◽  
Proton Exchange ◽  
Alcohol Molecule ◽  
Active Surface Area ◽  
Electrochemically Active ◽  
Dispersing Medium ◽  
Electrochemically Active Surface

The influence of the addition of methanol, ethanol, 1-propanol and 2-propanol to the dispersing medium of amixture of RuO2 and TiO2 sols on the electrochemically active surface area for proton exchange, as well as on the electrocatalytic activity for the chlorine evolution reaction (CER) of RuO2-TiO2/Ti electrode obtained by sol-gel procedure was investigated. The electrochemically active surface area was examined by cyclic voltammetry, while the analysis of the activity for the CER was performed by polarization measurements. The stability of the obtained anode coatings was also checked by an accelerated stability test. The anode properties depend on the number of C atoms in the alcohol molecule, as well as on the elapsed time between the preparation of the sols/alcohol mixture and its application onto the titanium support. The addition of alcohol increased the activity of the anodes for the CER, compared to those prepared without the addition, but their stability was smaller.

Real surface area measurements in electrochemistry

1992 ◽  
Vol 327 (1-2) ◽  
pp. 353-376 ◽  
Author(s):  
S. Trasatti ◽  
O.A. Petrii
Keyword(s):  
Surface Area ◽  
Real Surface ◽  
Real Surface Area

Electrooxidation of Hydrogen on Nanostructured Pt/C Catalysts for Polymer Electrolyte Fuel Cells

2006 ◽  
Vol 518 ◽  
pp. 283-288
Author(s):  
B. Babić ◽  
Velimir Radmilović ◽  
N. Krstajić ◽  
B. Kaludjerović
Keyword(s):  
Surface Area ◽  
Hydrogen Oxidation ◽  
Sol Gel ◽  
Catalyst Support ◽  
Active Surface ◽  
Exchange Current ◽  
Active Surface Area ◽  
High Catalytic Activity ◽  
Hydrogen Oxidation Reaction ◽  
Order Of Magnitude

Mesoporous carbon cryogel synthesized by sol-gel polycondensation and freeze-drying with specific surface area (BET) of 517 m2 g-1 was used as a catalyst support. Pt/C catalysts were prepared by a modified ethylene glycol method (EG). Transmission electron microscopy (TEM) images show that the dispersion of the catalyst is very uniform with a mean particle size of about 2.65 nm. Hydrogen oxidation reaction (HOR) was studied on Pt/C catalyst in 0.5 mol dm-3 HClO4 acid solution. It has been found that HOR appears as a reversible two-electron direct discharged reaction (Tafel slope for this reaction is ≈30mV dec-1) and that Pt/C catalyst exhibits a very high catalytic activity. However, the corresponding value of the exchange current density obtained by dividing the exchange current by the active surface area of Pt particles has the same order of magnitude as those for the HOR in acidic solution at single crystal and polycrystalline Pt.

Determination of the Real Surface Area of Pt Electrodes by Hydrogen Adsorption Using Cyclic Voltammetry

2000 ◽  
Vol 77 (9) ◽  
pp. 1195 ◽  
Author(s):  
José M. Doña Rodríguez ◽  
José Alberto Herrera Melián ◽  
Jesús Pérez Peña
Keyword(s):  
Cyclic Voltammetry ◽  
Surface Area ◽  
Hydrogen Adsorption ◽  
Real Surface ◽  
The Real ◽  
Pt Electrodes ◽  
Real Surface Area
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