Deactivation of nickel hydroxide-gold modified electrodes
The aim of the present work was to study how the charge-transport process of a nickel hydroxide film electrochemically synthesized on a gold substrate is modified when the electrode is stored for a long time. It was found that nickel hydroxide films are deactivated under storage, that is, films beca...
| Main Authors: | , |
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| Format: | Online |
| Language: | Spanish |
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Facultad de Ciencias Exactas, Químicas y Naturales
2013
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| Subjects: | |
| Online Access: | https://www.fceqyn.unam.edu.ar/recyt/index.php/recyt/article/view/395 |
| _version_ | 1824325820486778880 |
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| author | Tucceri, Ismael R. Caram, Bruno F. |
| author_facet | Tucceri, Ismael R. Caram, Bruno F. |
| author_sort | Tucceri, Ismael R. |
| collection | Revista de Ciencia y Tecnologia RECyT |
| description | The aim of the present work was to study how the charge-transport process of a nickel hydroxide film electrochemically synthesized on a gold substrate is modified when the electrode is stored for a long time. It was found that nickel hydroxide films are deactivated under storage, that is, films became less conductive than films immediately prepared (nondeactivated). This study was carried out in the context of the rotating disc electrode voltammetry when the modified electrode contacts an electroactive solution and a mediation reaction occurs at the Au-Ni(OH)2| electrolyte interface. Variations of anodic limiting currents with the electrode rotation rate, for both nondeactivated and deactivated films in the presence of the electroactive solute deferasirox (4-(3,5-bis(2-hydroxyphenyl)-1,2,4-triazol-1-yl) benzoic acid) allowed the obtention of a charge transport rate across a nickel hydroxide film. This rate decreased with the increase of the storage time. |
| format | Online |
| id | ojs-article-395 |
| institution | Facultad de Ciencias Exactas Quimicas y Naturales |
| language | Spanish |
| publishDate | 2013 |
| publisher | Facultad de Ciencias Exactas, Químicas y Naturales |
| record_format | ojs |
| spelling | ojs-article-3952020-03-06T10:54:37Z Deactivation of nickel hydroxide-gold modified electrodes Desactivación de electrodos de oro modificados con hidróxido de níquel Tucceri, Ismael R. Caram, Bruno F. Nickel hydroxide films Deactivation Charge transport process Deferasirox Mediation reaction Películas de hidróxido de níquel Desactivación Proceso de transporte de carga Deferasirox Mediación redox The aim of the present work was to study how the charge-transport process of a nickel hydroxide film electrochemically synthesized on a gold substrate is modified when the electrode is stored for a long time. It was found that nickel hydroxide films are deactivated under storage, that is, films became less conductive than films immediately prepared (nondeactivated). This study was carried out in the context of the rotating disc electrode voltammetry when the modified electrode contacts an electroactive solution and a mediation reaction occurs at the Au-Ni(OH)2| electrolyte interface. Variations of anodic limiting currents with the electrode rotation rate, for both nondeactivated and deactivated films in the presence of the electroactive solute deferasirox (4-(3,5-bis(2-hydroxyphenyl)-1,2,4-triazol-1-yl) benzoic acid) allowed the obtention of a charge transport rate across a nickel hydroxide film. This rate decreased with the increase of the storage time. En este trabajo se estudió la modificación (desactivación) que sufre el proceso de transporte de carga en películas de hidróxido de níquel, sintetizadas electroquímicamente sobre electrodos de oro, cuando son almacenadas sin uso durante tiempo prolongado. Se encontró que las películas usadas después de ser almacenadas, se tornan menos conductoras que las películas usadas inmediatamente después de ser preparadas. En este estudio se empleó como técnica electroquímica, la Voltamperometría Estacionaria con Electrodo de Disco Rotante (VEEDR). Se analizó las variación de la corriente límite anódica en presencia del soluto electroactivo Deferasirox (ácido (4-(3,5-bis(2-hidroxifenil)-1,2,4-triazol-1-il) benzoico), a distintas velocidades de rotación del electrodo. En presencia de esta droga, el hidróxido de níquel actúa como mediador redox. Sobre la base de la teoría del “hopping” electrónico se obtuvo la dependencia de la velocidad de transporte de carga en función del tiempo de almacenamiento de las películas. Facultad de Ciencias Exactas, Químicas y Naturales 2013-12-20 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.fceqyn.unam.edu.ar/recyt/index.php/recyt/article/view/395 Argentine Journal of Science and Technology; Vol. 20 No. 1 (2013); 11-18 Revista de Ciencia y Tecnología; Vol. 20 Núm. 1 (2013); 11-18 1851-7587 0329-8922 spa https://www.fceqyn.unam.edu.ar/recyt/index.php/recyt/article/view/395/312 Derechos de autor 2013 Revista de Ciencia y Tecnología |
| spellingShingle | Nickel hydroxide films Deactivation Charge transport process Deferasirox Mediation reaction Películas de hidróxido de níquel Desactivación Proceso de transporte de carga Deferasirox Mediación redox Tucceri, Ismael R. Caram, Bruno F. Deactivation of nickel hydroxide-gold modified electrodes |
| title | Deactivation of nickel hydroxide-gold modified electrodes |
| title_alt | Desactivación de electrodos de oro modificados con hidróxido de níquel |
| title_full | Deactivation of nickel hydroxide-gold modified electrodes |
| title_fullStr | Deactivation of nickel hydroxide-gold modified electrodes |
| title_full_unstemmed | Deactivation of nickel hydroxide-gold modified electrodes |
| title_short | Deactivation of nickel hydroxide-gold modified electrodes |
| title_sort | deactivation of nickel hydroxide gold modified electrodes |
| topic | Nickel hydroxide films Deactivation Charge transport process Deferasirox Mediation reaction Películas de hidróxido de níquel Desactivación Proceso de transporte de carga Deferasirox Mediación redox |
| topic_facet | Nickel hydroxide films Deactivation Charge transport process Deferasirox Mediation reaction Películas de hidróxido de níquel Desactivación Proceso de transporte de carga Deferasirox Mediación redox |
| url | https://www.fceqyn.unam.edu.ar/recyt/index.php/recyt/article/view/395 |
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Hydrogen Production by Glycerol Steam Reforming: Deactivation-Regeneration of a Nickel-Alumina Catalyst