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Your search keyword '"Waleed M. Omymen"' showing total 2 results
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2 results on '"Waleed M. Omymen"'

1. Photo-assisted electrochemical oxidation of the urea onto TiO2-nanotubes modified by hematite

Author

Waleed M. Omymen, Jelena R. Rogan, Branimir Z. JugoviÄ, Milica M. GvozdenoviÄ, and Branimir N. Grgur

Subjects
Chemistry, QD1-999
Abstract

The electrochemical oxidation of the urea in near neutral pH is investigated on platinum electrode. It is shown that oxidation reaction is practically inhibited up to the potentials of â¼0.9Â V. The same reaction is investigated onto electrochemically obtained titanium dioxide nanotubes modified by hematite using facile, low-cost successive ion layer adsorption and reaction (SILAR) method. It is shown that such system possesses electrocatalytic activity at very low potentials, and activity can be further improved by the illumination of the electrode in the photo-assisted reaction. The possible application of the photoactive anode is considered in the application of urea based water electrolysis and urea based fuel cell. Keywords: Photoelectrochemical cell, Water electrolysis, Fuel cell, SILAR

Published
2017
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2. Photoelectochemical behavior of TiO2-NT’s modified with SILAR deposited iron oxide

Author

Waleed M. Omymen, Tomislav Trišović, Ali Ebshish, Branimir N. Grgur, Milica M. Gvozdenović, and Branimir Jugović

Subjects
Band gap, General Chemical Engineering, Inorganic chemistry, Iron oxide, Hematite, Hypochlorite, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, chemistry.chemical_compound, Electrochemistry, Forced hydrolysis, Photoelectrochemical cell, Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Anode, visual_art, Electrode, visual_art.visual_art_medium, 0210 nano-technology, Current density, Flat band potential
Abstract

The fast reaction of forced hydrolysis of iron(III) nitrate in hypochlorite solution at room temperature, leads to the formation of mainly hematite, α-Fe2O3. Successive ion adsorption and reaction (SILAR) is applied to decorate an electrochemically formed TiO2 nanotube electrode. The anodic photoelectrochemical behavior of pure TiO2-NT’s and modified electrodes are investigated in a sulfate containing solution at pH = 9.2. It is shown that such a modification leads to an increase of anodic photoactivity, as well as that at the same current density, the photoelectrochemical cell with a modified electrode operates at a voltage lower by 0.7 V. The band gap and flat band potentials are estimated, and the structure of the band gap and possible charge transfer reactions and mechanism are discussed.

Published
2016
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