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

MARIELA GISELA ORTIZ; SILVIA GRACIELA REAL; ELIDA BEATRIZ CASTRO

JOURNAL OF SOLID STATE ELECTROCHEMISTRY (PRINT)

SPRINGER

Lugar: Berlin; Año: 2015 p. 1 - 8

1432-8488

The hydrothermal method was used to synthesizemulti-walled carbon nanotube/nickel hydroxide composites(MWCNT/Ni(OH)2). The structure and morphology of theprepared materials were characterized by X-ray diffractionand transmission electron microscopy. The electrochemicalperformance of cathodes prepared with multi-walled carbonnanotubes (MWCNT) loaded into the β-nickel hydroxide materialswas investigated employing cyclic voltammetry, galvanostaticcharge/discharge and electrochemical impedancespectroscopic measurements. It is shown that the cathodeactive material utilization increases for MWCNT/Ni(OH)2 obtained after 24 h of hydrothermal synthesis.These composites exhibit a fairly good electrochemicalperformance as cathode materials. Based on the results,this fact could be associated with the formation of acontinuous conductive network structure in the hydroxidematrix. The analyses of impedance data, accordingto a physicochemical model, allow the improvement ofa better understanding of the main structural and physicochemicalparameters that control the electrochemicalperformance of these systems.