Tailoring cobalt doped zinc oxide nanocrystals with high capacitance activity: Factors affecting structure and surface morphology

Marauo Davis, Cenk Gümeci, Bria Black, Carol Korzeniewski, Louisa Hope-Weeks

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

Highly crystalline zinc cobaltite (ZnCo 2O 4) nanocrystals were successfully synthesized through an epoxide driven, sol-gel method using Zn(NO 3)·6H 2O and CoCl 2·6H 2O as precursors. The crystal phase, morphology, specific surface areas, porosity, and capacitance activity of the prepared materials were characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), gas sorption techniques, and cyclic voltammetry, respectively. Results reveal that the synthesized nanocrystals are ∼4 nm in diameter. Electron microscopy studies illustrate significant changes brought on by varying the solvent and epoxide. Gas sorption analyses detail high specific surface areas (>200 m 2 g -1) and porosities of the as prepared and annealed samples. Cyclic voltammetry experiments show that these zinc cobaltite nanocrystals have exceptional capacitance (∼700 Fg -1) and excellent cycle durability making them an excellent electrode material for supercapacitors.

Original languageEnglish
Pages (from-to)2061-2066
Number of pages6
JournalRSC Advances
Volume2
Issue number5
DOIs
StatePublished - Mar 7 2012

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