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Title: Mesoscale assembly of NiO nanosheets into spheres

NiO solid/hollow spheres with diameters about 100 nm have been successfully synthesized through thermal decomposition of nickel acetate in ethylene glycol at 200 deg. C. These spheres are composed of nanosheets about 3-5 nm thick. Introducing poly(vinyl pyrrolidone) (PVP) surfactant to reaction system can effectively control the products' morphology. By adjusting the quantity of PVP, we accomplish surface areas-tunable NiO assembled spheres from {approx}70 to {approx}200 m{sup 2} g{sup -1}. Electrochemical tests show that NiO hollow spheres deliver a large discharge capacity of 823 mA h g{sup -1}. Furthermore, these hollow spheres also display a slow capacity-fading rate. A series of contrastive experiments demonstrate that the surface area of NiO assembled spheres has a noticeable influence on their discharge capacity. - Graphical abstract: The mesoscale assembly of NiO nanosheets into spheres have been achieved by a solvothermal method. N{sub 2} adsorption/desorption isotherms show the S{sub BET} of NiO is tunable. NiO spheres show large discharge capacity and slow capacity-fading rate.
Authors:
 [1] ; ; ;  [1]
  1. School of Materials Science and Engineering, Henan University of Technology, Zhengzhou, Henan 450007 (China)
Publication Date:
OSTI Identifier:
21370399
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 182; Journal Issue: 5; Other Information: DOI: 10.1016/j.jssc.2008.12.029; PII: S0022-4596(08)00645-2; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ACETATES; ELECTROCHEMISTRY; NANOSTRUCTURES; NICKEL OXIDES; PVP; PYROLYSIS; SHEETS; SPHERES; SURFACE AREA; TEMPERATURE RANGE 0400-1000 K AMIDES; AZOLES; BLOOD SUBSTITUTES; CARBOXYLIC ACID SALTS; CHALCOGENIDES; CHEMICAL REACTIONS; CHEMISTRY; DECOMPOSITION; DRUGS; HEMATOLOGIC AGENTS; HETEROCYCLIC COMPOUNDS; LACTAMS; NICKEL COMPOUNDS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; ORGANIC POLYMERS; OXIDES; OXYGEN COMPOUNDS; POLYMERS; POLYVINYLS; PYRROLES; PYRROLIDONES; SURFACE PROPERTIES; TEMPERATURE RANGE; THERMOCHEMICAL PROCESSES; TRANSITION ELEMENT COMPOUNDS