Volume 3, Issue 6-1, December 2014, Page: 1-6
Exploration of the Thermally Prepared Iridium Oxide (IrO2) and Tantalum Pentoxide (Ta2O5) Coated Titanium Anode in the Oxygen Evolution Reactions (OER)
Gracien Ekoko Bakambo, Chemistry Department, University of Kinshasa, P.O. Box 190, Kinshasa XI, Democratic Republic of Congo
Joseph Kanza-Kanza Lobo, Chemistry Department, University of Kinshasa, P.O. Box 190, Kinshasa XI, Democratic Republic of Congo
Omer Muamba Mvele, Chemistry Department, University of Kinshasa, P.O. Box 190, Kinshasa XI, Democratic Republic of Congo
Jérémie Muswema Lunguya, Chemistry Department, University of Kinshasa, P.O. Box 190, Kinshasa XI, Democratic Republic of Congo
Jean-Felix Yamambe Senga, Chemistry Department, University of Kinshasa, P.O. Box 190, Kinshasa XI, Democratic Republic of Congo
Peter Mangwala Kimpende, Chemistry Department, University of Kinshasa, P.O. Box 190, Kinshasa XI, Democratic Republic of Congo
Received: Oct. 8, 2014;       Accepted: Nov. 24, 2014;       Published: Nov. 29, 2014
DOI: 10.11648/j.ijmsa.s.2014030601.11      View  4361      Downloads  267
Abstract
A coat consisting of IrO2-Ta2O5 as a catalytically active layer on a titanium substrate was prepared by the thermal decomposition method followed by the anodic electrolysis process in an aqueous solution of H2SO4 0.5 mol.dm-3 at 4 A.Cm-2 current density. The morphology and the composition of the coating were investigated both by the field emission scanning electron microscope (FE-SEM) coupled with the energy dispersive X-ray spectrometer (EDS), X-ray diffraction (XRD), and by X-ray photoelectron spectroscopy (XPS). The XRD and the XPS experimental results revealed that some of the texture coefficients of IrO2-rutile crystal preferentially grown and the crystal lattice changes with aging time in air furnace at 100 °C. It was observed that at 4 A.Cm-2, this coated material behaves as a good catalytically active layer for oxygen evolution reactions (OER). The OER process leads to the corrosion of the surface banks layer by layer, and consequently the cracks appeared and expanded, resulting in fragmentation and further peeling. The EDS results revealed that during the electrolysis of the coated electrode there was a selective consumption of the iridium oxide. The presence of titanium metal was detected in the outermost coating. This might be originated from the titanium foil dissolved and diffused through the coated layer defects during the electrolysis process.
Keywords
Iridium Oxide (IrO2), Tantalum Pentoxide (Ta2O5), Ti Metal, OER
To cite this article
Gracien Ekoko Bakambo, Joseph Kanza-Kanza Lobo, Omer Muamba Mvele, Jérémie Muswema Lunguya, Jean-Felix Yamambe Senga, Peter Mangwala Kimpende, Exploration of the Thermally Prepared Iridium Oxide (IrO2) and Tantalum Pentoxide (Ta2O5) Coated Titanium Anode in the Oxygen Evolution Reactions (OER), International Journal of Materials Science and Applications. Special Issue: Materials Science. Vol. 3, No. 6-1, 2014, pp. 1-6. doi: 10.11648/j.ijmsa.s.2014030601.11
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