Influence of molar fraction of Mg/Al, on the electrochemical behavior of hycrotalcite-epoxy-graphite composites
| Autor: | Jhonny Huertas Flores, Antonio Aparecido Pupim Ferreira, Abel I. Balbin Tamayo, Ricardo Q. Aucélio, Ana Margarita Esteva Guas |
|---|---|
| Přispěvatelé: | Univ Havana, Universidade Estadual Paulista (Unesp), Pontificia Univ Catolica Rio de Janeiro, Universidade do Estado do Rio de Janeiro (UERJ) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Ion exchange Hydrotalcite Inorganic chemistry Characterized 02 engineering and technology Electro-catalysis 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry Mole fraction 01 natural sciences Redox 0104 chemical sciences Dielectric spectroscopy Modified electrodes chemistry.chemical_compound chemistry Epoxy-graphite-hydrotalcite General Materials Science Ferricyanide 0210 nano-technology Voltammetry |
| Zdroj: | Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2021-06-25T11:21:43Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-10-01 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The layered structure of hydrotalcite-like compounds is responsible for many chemical and physical properties attractive in designing electrodes for analytical applications. Mg/Al hydrotalcite-like materials were prepared with different Mg/Al molar ratios ranging from 1.5:1 to 6:1 and electrochemically characterized before being included into epoxy-graphite to form the electrode matrix. The electrochemical response of the electrodes was evaluated by the use of potassium ferro/ferricyanide redox pair as a probe for voltammetry and impedance spectroscopy. The electm-catalytic effect on the potassium ferm/ferricyanide redox pair showed was more effective when Mg and Al is 1.5:/1 M proportion due, apparently, to the more positively charged hydrotalcite layers and more affinity for anions such as Fe(CN)(6)(3-/4-). This epoxy-graphite-hydrotalcite composite presents the lowest potential difference and lowest loading transfer resistance associated with the hydrotalcite phase, which are desirable properties for potential electroanalytical purposes. The results indicated the potential application of the epoxy-graphite-hydrotalcite electrode for ion exchange of negative-charged chemical species. Univ Havana, Dept Analyt Chem, Havana, Cuba Sao Paulo State Univ, Dept Analyt Chem, Sao Paulo, SP, Brazil Pontificia Univ Catolica Rio de Janeiro, Dept Chem, Rio De Janeiro, RJ, Brazil Univ Estado Rio De Janeiro, Dept Mech Engn & Energy, Rio De Janeiro, RJ, Brazil Sao Paulo State Univ, Dept Analyt Chem, Sao Paulo, SP, Brazil CAPES: 213/14 FAPERJ: E-26/202.912/2017 CNPq: 409090/2018-2 CNPq: 303866/2017-9 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|