SYNTHESIS AND CHARACTERIZATION OF PALLADIUM NANOPARTICLES IMMOBILIZED ON TiO2 NANOTUBES AS A NEW HIGH ACTIVE ELECTRODE FOR METHANOL ELECTRO-OXIDATION

2012 ◽  
Vol 11 (02) ◽  
pp. 1250016 ◽  
Author(s):  
M. G. HOSSEINI ◽  
M. M. MOMENI ◽  
H. KHALILPUR
Keyword(s):  
Catalytic Activity ◽  
Palladium Nanoparticles ◽  
Electrochemical Impedance ◽  
Titanium Substrate ◽  
Active Electrode ◽  
Self Organized ◽  
Application Potential ◽  
Electro Oxidation ◽  
Electro Catalytic Activity

Self-organized TiO2 nanotubes/titanium substrate modified with palladium nanoparticles ( Pd/TiO2/Ti electrodes) were prepared by a two-step process consisting of anodizing of titanium plate followed by electroless plating of palladium on resulted TiO2 nanotubes. The morphology and surface analysis of Pd/TiO2/Ti electrodes were investigated using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX), respectively. The results indicated that palladium nanoparticles were homogeneously deposited on the surface of TiO2 nanotubes. The electro-catalytic activity of Pd/TiO2/Ti electrodes in the methanol electro-oxidation was studied by cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) methods. The results indicate that Pd/TiO2/Ti electrode improve the electro-catalytic activity for methanol oxidation greatly and confirmed the better electro-catalytic activity and stability of these new electrodes. So, the Pd/TiO2/Ti electrodes have a good application potential to fuel cells.

scholarly journals Electrical Characterization of Titanium Dioxide Nanotubes Using Dielectric and Electrochemical Impedance Spectroscopy

2019 ◽  
Vol 69 (12) ◽  
pp. 3494-3499
Author(s):  
Veronica Manescu (Paltanea) ◽  
Gheorghe Paltanea ◽  
Iosif Vasile Nemoianu ◽  
Dorina Popovici ◽  
Radu Mircea Ciuceanu
Keyword(s):  
Impedance Spectroscopy ◽  
Titanium Surface ◽  
Electrochemical Impedance ◽  
Electrical Characterization ◽  
Point Of View ◽  
Tio2 Nanotube ◽  
Titanium Dioxide Nanotubes ◽  
One Dimensional ◽  
Self Organized

The paper is devoted to the electrochemical anodizing method for TiO2 nanotube layers generation on titanium surface. It is commonly accepted that parameters like anodizing time, electrical voltage and the actual type of electrolyte are important factors in what concerns the TiO2 nanotube diameters and their surface density. The present study considers self-organized titanium nanotubes resulted from an aqueous solution of 49.5 wt% H2O, 49.5 wt% glycerol, 1 wt% HF used as the electrolyte. The actual anodizing duration was 8 hours at an applied voltage of 25 V. Through the technique of scanning electron microscopy, it is shown that the resulted tubular nanostructure is one-dimensional having an approximate inner and outer diameters of 90 nm and 110 nm, respectively. From an electrical point of view, the analysed materials properties were determined using electrochemical and dielectric impedance spectroscopy tests.

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