Electrochemical characterization of MWCNT Ni(OH)₂ composites as cathode materials

• Autores: Ortiz, Mariela; Real, Silvia Graciela; Castro, Élida Beatriz
• Año de publicación: 2015
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Química; Electrochemical Characterization; Hydrothermal Synthesis; Mwcnt; Ni/Mh Batteries; Nickel Electrode
• Institución: Universidad Nacional de La Plata

The hydrothermal method was used to synthesize multi-walled carbon nanotube/nickel hydroxide composites (MWCNT/Ni(OH)₂). The structure and morphology of the prepared materials were characterized by X-ray diffraction and transmission electron microscopy. The electrochemical performance of cathodes prepared with multi-walled carbon nanotubes (MWCNT) loaded into the β-nickel hydroxide materials was investigated employing cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopic measurements. It is shown that the cathode active material utilization increases for MWCNT/Ni(OH)₂ obtained after 24 h of hydrothermal synthesis. These composites exhibit a fairly good electrochemical performance as cathode materials. Based on the results, this fact could be associated with the formation of a continuous conductive network structure in the hydroxide matrix. The analyses of impedance data, according to a physicochemical model, allow the improvement of a better understanding of the main structural and physicochemical parameters that control the electrochemical performance of these systems.
Facultad de Ciencias Exactas