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Surface characterization by UHV techniques and cyclic voltammetry of thermal IrO2-based electrocatalysts containing TiO2 and CeO2
| Content Provider | Semantic Scholar |
|---|---|
| Author | Alves, Valéria Almeida Silva, Luís Antônio Da Castro, Sandra C. De Boodts, Julien F. C. |
| Copyright Year | 1998 |
| Abstract | Electrodes of nominal composition Ir 0.3Ti 0.7- xCe xO 2 (0? x?0.7) have been prepared by thermal decomposition of mixtures of the chloride precursors (450°C). A systematic study of the morphology, chemical composition and surface properties of these electrodes was performed using both exsitu (SEM, EDX, XPS) and insitu (cyclic voltammetry) techniques. A spectrophotometric study of the precursor salt mixtures was done. SEM analysis showed the introduction of CeO 2 into the binary system to provoke a significant increase in the active surface area of these electrode materials, which is corroborated by the CV data (anodic voltammetric charge, qa*, double layer capacitance, Cdl, and roughness factor). Apparent Ti-enrichment of the more external region of the coatings, as evidenced by EDX, is related to the fact this technique analyses a thicker part of the oxide bulk (estimated as ca. 1/3 of the layer thickness). No real surface Ti-enrichment occurs as supported by close to nominal Ir/Ti ratios obtained by XPS (a real surface technique). XPS measurements also support Ir, Ti and Ce are present in freshly prepared oxide layers in two oxidation states, which is in agreement with the spectrophotometric results. |
| Starting Page | 711 |
| Ending Page | 717 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/A702740K |
| Volume Number | 94 |
| Alternate Webpage(s) | http://repositorio.unicamp.br/jspui/bitstream/REPOSIP/74857/1/WOS000072483100015.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/A702740K |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
