title: Mesoporous Vertical Co3O4 Nanosheet Arrays on Nitrogen-Doped Graphene Foam with Enhanced Charge-Storage Performance.
abstract: A hierarchical electrode structure, consisting of cobalt oxide and nitrogen-doped graphene foam (NGF), has been fabricated with the aim of achieving enhanced charge-storage performance. Characterization of the material via electron microscopy and Raman spectroscopy demonstrates that the Co3O4 nanosheets grow vertically on NGF and the nanosheets are mesoporous with pore diameters between 3 and 8 nm. The Co3O4/NGF electrode shows an enhanced charge-storage performance, attributed to the 3D hierarchical structure and the synergistic effect of Co3O4 and NGF. The present study shows that specific capacitances as high as 451 F g(-1) can be obtained, indicating that high-performance electrochemical capacitors can be made using electrode materials with advanced structures. The present electrode design can be readily extended to other electroactive materials and their composites.
authors.affiliation: School of Chemistry and‡School of Materials, University of Manchester , Manchester M13 9PL, United Kingdom.
authors.forename: Yuqin
authors.initials: Y
authors.lastname: Zou
authors.affiliation: School of Chemistry and‡School of Materials, University of Manchester , Manchester M13 9PL, United Kingdom.
authors.forename: Ian A
authors.initials: IA
authors.lastname: Kinloch
authors.affiliation: School of Chemistry and‡School of Materials, University of Manchester , Manchester M13 9PL, United Kingdom.
authors.forename: Robert A W
authors.initials: RA
authors.lastname: Dryfe
keywords: charge storage; cobalt oxide; enhanced capacitive performance; hollow 3D structure; nitrogen-doped graphene foam