Título

Ni microspheres as electrocatalysts for ethanol oxidation in an alkaline medium

Autor

ALEJANDRO ALTAMIRANO GUTIERREZ

GUSTAVO ERNESTO MARTINEZ TAPIA

Luis Carlos Ordóñez López

Nivel de Acceso

Acceso Abierto

Licencia

http://creativecommons.org/licenses/by-nc-nd/4.0

Referencia de datos

datasetDOI/10.20964/2018.05.04

Materias

NICKEL MICROSPHERES - (AUTORES) MICROEMULSION SYNTHESIS - (AUTORES) ELECTROCATALYSTS - (AUTORES) ANODE - (AUTORES) ALKALINE DIRECT ALCOHOL FUEL CELLS - (AUTORES) INGENIERÍA Y TECNOLOGÍA - (CTI) INGENIERÍA Y TECNOLOGÍA - (CTI)

Resumen o descripción

We report the synthesis of nickel microspheres and their structural and electrochemical characterization. The materials were prepared by the microemulsion technique from NiSO4∙6H2O and NaOH, and using NaH2PO2∙H2O as a reducing agent. Sodium dodecyl sulfate (SDS) was used as a surfactant. The following ternary formulations were used for their synthesis: N1 (90%H2O-7.5%SDS-2.5%Pentanol), N2 (92.5%H2O-5%SDS-2.5%Pentanol), N3 (95%H2O-3.75%SDS-1.25%Pentanol) and N4 (99%H2O-0.75%SDS-0.25%Pentanol). The catalysts were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The catalytic activity for ethanol oxidation in an alkaline medium was evaluated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The average diameters of the nickel microspheres ranged from 0.375 to 1.476 m. On subjecting the materials to heat treatment in a nitrogen atmosphere at 300 °C for 4 h, mixtures of polycrystalline Ni and nickel phosphide (Ni3P) were obtained. The best performance for the ethanol oxidation reaction (EOR) in an alkaline medium was recorded with non-heat-treated nickel microspheres, presenting a maximum peak potential at approximately 0.7 V vs. Hg/HgO with normalized currents between 10.774 and 18.198 mA(mgcat)-1. These results indicate that nickel microspheres are potential candidates for use as anodes in alkaline direct alcohol fuel cells (A-DAFCs).

Fecha de publicación

2018

Tipo de publicación

Artículo

Versión de la publicación

Versión publicada

Recurso de información

http://cicy.repositorioinstitucional.mx/jspui/handle/1003/1545

Formato

application/pdf

Fuente

International Journal of Electrochemical Science, 13, 5068-5084, 2018.

Idioma

Inglés

Relación

&

Ordóñez, L. C. (2018). Ni Microspheres as Electrocatalysts for Ethanol Oxidation in an Alkaline Medium. International Journal of Electrochemical Science, 13, 5068-5084.

Sugerencia de citación

Altamirano-Gutiérrez, A., Martínez-Tapia, G. E.,

Repositorio Orígen

Repositorio Institucional CICY

Descargas

238