| Texto completo | |
| Autor(es): |
Sedenho, Graziela C.
[1, 2]
;
Lee, Patricia T.
[2]
;
Toh, Her Shuang
[2]
;
Salter, Chris
[3]
;
Johnston, Colin
[3]
;
Stradiotto, Nelson R.
[1]
;
Compton, Richard G.
[2]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Paulista UNESP, Inst Chem, Dept Analyt Chem, BR-14800060 Araraquara, SP - Brazil
[2] Univ Oxford, Dept Chem, Phys & Theoret Chem Lab, Oxford OX1 3QZ - England
[3] Univ Oxford, Dept Mat, Oxford OX5 1PF - England
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Physical Chemistry C; v. 119, n. 12, p. 6896-6905, MAR 26 2015. |
| Citações Web of Science: | 7 |
| Resumo | |
We report the electrocatalytic effect of oxidized nickel nanoparticles on lactic acid oxidation in alkaline solution. A boron-doped diamond electrode was modified with nickel nanoparticles by electrodeposition. Various electrodeposition charges were used to deposit nanoparticles of different sizes onto the electrode. Afterward, the nickel nanoparticle modified boron-doped diamond electrodes were initially oxidized in NaOH solution to form beta-Ni(OH)(2) on the surface. Further oxidation forms the Ni(2+/3+) redox couple, beta-Ni(OH)(2)/beta-NiOOH, which catalyzes lactic acid oxidation. Studies in the absence and in the presence of lactic acid were performed and compared to the behavior of the Ni(2+/3+) redox couple on a bulk nickel electrode. The anodic peak was greater than the cathodic peak current in both situations and attributed to the catalytic effect of NiOOH on the oxidation of lactic acid. The ratio between the anodic and cathodic peaks was normalized to the amount of the Ni((2+/3+)) couple on the electrode, and it was found that for suitably small nickel nanoparticles (diameter = 31.8 +/- 7.0 nm) authentic catalytic behavior was seen when compared to a bulk nickel electrode. (AU) | |
| Processo FAPESP: | 14/10391-0 - Estudo da influência de substituintes na estrutura de ácidos carboxílicos na oxidação eletroquímica desses compostos em eletrodos de diamante dopado com boro modificados com nanopartículas de níquel e de platina |
| Beneficiário: | Graziela Cristina Sedenho |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Mestrado |