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Title: Physical and electrochemical study of cobalt oxide nano- and microparticles

Cobalt oxide nanocrystals of size 17–21 nm were synthesized by a simple reaction between cobalt acetate (II) and dodecylamine. On the other hand, micrometric Co{sub 3}O{sub 4} was prepared using the ceramic method. The structural examination of these materials was performed using powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM and HRTEM). XRD studies showed that the oxides were pure, well-crystallized, spinel cubic phases with a-cell parameter of 0.8049 nm and 0.8069 nm for the nano and micro-oxide, respectively. The average particle size was 19 nm (nano-oxide) and 1250 μm (micro-oxide). Morphological studies carried out by SEM and TEM analyses have shown the presence of octahedral particles in both cases. Bulk and surface properties investigated by X-ray photoelectron spectroscopy (XPS), point zero charge (pzc), FTIR and cyclic voltammetry indicated that there were no significant differences in the composition on both materials. The magnetic behavior of the samples was determined using a vibrating sample magnetometer. The compounds showed paramagnetic character and no coercivity and remanence in all cases. Galvanostatic measurements of electrodes formed with nanocrystals showed better performance than those built with micrometric particles. - Highlights: • Spinel Co{sub 3}O{sub 4} nanoparticles and microparticles withmore » same structure but with different cell parameters, particle size and surface area were synthesized. • Oxide nanoparticles showed better electrochemical behavior than micrometric ones due to area effect.« less
Authors:
 [1] ;  [2] ;  [3] ;  [2] ; ;  [3] ;  [4] ;  [1] ;  [1]
  1. Dpto. de Química de los Materiales, USACh, Av. L.B.O.‘Higgins 3363, 9170022 Santiago (Chile)
  2. (Chile)
  3. Dpto. de Física, USACh and CEDENNA, Av. Ecuador 3493, 9170124 Santiago (Chile)
  4. Instituto de Química Física “Rocasolano”, CSIC, c/Serrano 119, 28006 Madrid (Spain)
Publication Date:
OSTI Identifier:
22340391
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 93; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; CERAMICS; COBALT OXIDES; COERCIVE FORCE; ELECTRODES; FOURIER TRANSFORM SPECTROMETERS; FOURIER TRANSFORMATION; INFRARED SPECTRA; NANOPARTICLES; NANOSTRUCTURES; PARAMAGNETISM; PARTICLE SIZE; POWDERS; SCANNING ELECTRON MICROSCOPY; SPINELS; SURFACE AREA; TRANSMISSION ELECTRON MICROSCOPY; VIBRATING SAMPLE MAGNETOMETERS; VOLTAMETRY; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY