title: Atomic-layer-deposition alumina induced carbon on porous Ni(x)Co(1-x)O nanonets for enhanced pseudocapacitive and Li-ion storage performance.
abstract: A unique composite nanonet of metal oxide@carbon interconnected sheets is obtained by atomic layer deposition (ALD)-assisted fabrication. In this nanonet structure, mesoporous metal oxide nanosheets are covered by a layer of amorphous carbon nanoflakes. Specifically, quasi-vertical aligned and mesoporous Ni(x)Co(1-x)O nanosheets are first fabricated directly on nickel foam substrates by a hydrothermal method. Then, an ALD-enabled carbon coating method is applied for the growth of carbon nanoflakes on the surface of the nanosheets. The thus formed 3D hierarchical structure of Ni(x)Co(1-x)O@carbon composite flakes have a higher surface area, better electrical conductivity and structure stability than the bare Ni(x)Co(1-x)O. The application of such composite nanomaterials is demonstrated as electrodes for a supercapacitor and a lithium-ion battery. In both tests, the composite electrode shows enhancement in capacity and cycling stability. This effective composite nanostructure design of metal oxides@carbon flakes could provide a promising method to construct high-performance materials for energy and environment applications.
authors.affiliation: Department of Materials Science and Engineering, National University of Singapore, 117574 Singapore. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore.
authors.forename: Cao
authors.initials: C
authors.lastname: Guan
authors.forename: Yadong
authors.initials: Y
authors.lastname: Wang
authors.forename: Margit
authors.initials: M
authors.lastname: Zacharias
authors.forename: John
authors.initials: J
authors.lastname: Wang
authors.forename: Hong Jin
authors.initials: HJ
authors.lastname: Fan