<b>Investigation of the electrochemical behaviour of thermally prepared Pt-IrO<sub>2</sub> electrodes</b>
Different IrO<sub>2</sub> electrodes in which the molar percentage of platinum (Pt) varies from 0 %mol Pt to 100 %mol Pt were prepared on titanium (Ti) substrate by thermal decomposition techniques. The electrodes were characterized physically (SEM, XPS) and electrochemically and then ap...
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| Format: | Article |
| Language: | English |
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Chemical Society of Ethiopia
2008-04-01
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| Series: | Bulletin of the Chemical Society of Ethiopia |
| Subjects: | |
| Online Access: | http://www.ajol.info/index.php/bcse/article/view/61348 |
| _version_ | 1819148461789937664 |
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| author | Konan Honoré Kondro Lassine Ouattara Albert Trokourey |
| author_facet | Konan Honoré Kondro Lassine Ouattara Albert Trokourey |
| author_sort | Konan Honoré Kondro |
| collection | DOAJ |
| description | Different IrO<sub>2</sub> electrodes in which the molar percentage of platinum (Pt) varies from 0 %mol Pt to 100 %mol Pt were prepared on titanium (Ti) substrate by thermal decomposition techniques. The electrodes were characterized physically (SEM, XPS) and electrochemically and then applied to methanol oxidation. The SEM micrographs indicated that the electrodes present different morphologies depending on the amount of platinum in the deposit and the cracks observed on the 0 %mol Pt electrode diminish in size tending to a compact and rough surface for 70 %mol Pt electrode. XPS results indicate good quality of the coating layer deposited on the titanium substrate. The voltammetric investigations in the supporting electrolyte indicate that the electrodes with low amount of platinum (less than 10 %mol Pt) behave as pure IrO<sub>2</sub>. But in the case of electrodes containing more than 40 %mol Pt, the voltammograms are like that of platinum. Electrocatalytic activity towards methanol oxidation was observed with the electrodes containing high amount of platinum. Its oxidation begins at a potential of about 210 mV lower on such electrodes than the pure platinum electrode (100 %mol Pt). But for electrode containing low quantity of Pt, the surface of the coating is essentially composed of IrO<sub>2</sub> and methanol oxidation occurs in the domain of water decomposition solely. The increase of the electrocatalytic behaviour of the electrodes containing high amount of Pt towards methanol oxidation is due to the bifunctional behaviour of the electrodes. |
| first_indexed | 2024-12-22T13:46:05Z |
| format | Article |
| id | doaj.art-48db7726793a4a63a8d02e587a29755e |
| institution | Directory Open Access Journal |
| issn | 1011-3924 1726-801X |
| language | English |
| last_indexed | 2024-12-22T13:46:05Z |
| publishDate | 2008-04-01 |
| publisher | Chemical Society of Ethiopia |
| record_format | Article |
| series | Bulletin of the Chemical Society of Ethiopia |
| spelling | doaj.art-48db7726793a4a63a8d02e587a29755e2022-12-21T18:23:47ZengChemical Society of EthiopiaBulletin of the Chemical Society of Ethiopia1011-39241726-801X2008-04-01221125134<b>Investigation of the electrochemical behaviour of thermally prepared Pt-IrO<sub>2</sub> electrodes</b>Konan Honoré KondroLassine OuattaraAlbert TrokoureyDifferent IrO<sub>2</sub> electrodes in which the molar percentage of platinum (Pt) varies from 0 %mol Pt to 100 %mol Pt were prepared on titanium (Ti) substrate by thermal decomposition techniques. The electrodes were characterized physically (SEM, XPS) and electrochemically and then applied to methanol oxidation. The SEM micrographs indicated that the electrodes present different morphologies depending on the amount of platinum in the deposit and the cracks observed on the 0 %mol Pt electrode diminish in size tending to a compact and rough surface for 70 %mol Pt electrode. XPS results indicate good quality of the coating layer deposited on the titanium substrate. The voltammetric investigations in the supporting electrolyte indicate that the electrodes with low amount of platinum (less than 10 %mol Pt) behave as pure IrO<sub>2</sub>. But in the case of electrodes containing more than 40 %mol Pt, the voltammograms are like that of platinum. Electrocatalytic activity towards methanol oxidation was observed with the electrodes containing high amount of platinum. Its oxidation begins at a potential of about 210 mV lower on such electrodes than the pure platinum electrode (100 %mol Pt). But for electrode containing low quantity of Pt, the surface of the coating is essentially composed of IrO<sub>2</sub> and methanol oxidation occurs in the domain of water decomposition solely. The increase of the electrocatalytic behaviour of the electrodes containing high amount of Pt towards methanol oxidation is due to the bifunctional behaviour of the electrodes.http://www.ajol.info/index.php/bcse/article/view/61348Iridium dioxidePlatinumMethanol oxidationElectrocatalytic activity |
| spellingShingle | Konan Honoré Kondro Lassine Ouattara Albert Trokourey <b>Investigation of the electrochemical behaviour of thermally prepared Pt-IrO<sub>2</sub> electrodes</b> Bulletin of the Chemical Society of Ethiopia Iridium dioxide Platinum Methanol oxidation Electrocatalytic activity |
| title | <b>Investigation of the electrochemical behaviour of thermally prepared Pt-IrO<sub>2</sub> electrodes</b> |
| title_full | <b>Investigation of the electrochemical behaviour of thermally prepared Pt-IrO<sub>2</sub> electrodes</b> |
| title_fullStr | <b>Investigation of the electrochemical behaviour of thermally prepared Pt-IrO<sub>2</sub> electrodes</b> |
| title_full_unstemmed | <b>Investigation of the electrochemical behaviour of thermally prepared Pt-IrO<sub>2</sub> electrodes</b> |
| title_short | <b>Investigation of the electrochemical behaviour of thermally prepared Pt-IrO<sub>2</sub> electrodes</b> |
| title_sort | b investigation of the electrochemical behaviour of thermally prepared pt iro sub 2 sub electrodes b |
| topic | Iridium dioxide Platinum Methanol oxidation Electrocatalytic activity |
| url | http://www.ajol.info/index.php/bcse/article/view/61348 |
| work_keys_str_mv | AT konanhonorekondro binvestigationoftheelectrochemicalbehaviourofthermallypreparedptirosub2subelectrodesb AT lassineouattara binvestigationoftheelectrochemicalbehaviourofthermallypreparedptirosub2subelectrodesb AT alberttrokourey binvestigationoftheelectrochemicalbehaviourofthermallypreparedptirosub2subelectrodesb |