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Pseudocapacitance of Mesoporous Spinel-Type MCo₂O₄ (M = Co, Zn, and Ni) Rods Fabricated by a Facile Solvothermal Route

Kumar, Vijay; Mariappan, Chinnasamy Ramaraj; Azmi, Raheleh; Moock, Dominique; Indris, Sylvio ORCID iD icon; Bruns, Michael; Ehrenberg, Helmut; Vijaya Prakash, Gaddam


We present the structural properties and electrochemical capacitance of mesoporous MCo2O4 (M = Co, Zn, and Ni) rods synthesized by a facile solvothermal route without necessity to use templates. The Brunauer–Emmett–Teller specific surface areas of these mesoporous rods are found to be about 24, 54, and 62 m2 g–1 with major pore diameters of about 31, 15, and 9 nm for MCo2O4, M = Co, Zn, and Ni, respectively. X-ray photoelectron spectroscopy and X-ray diffraction studies reveal the phase purity of the samples with a predominant spinel-type crystal structure. The spinel crystal structure with lattice parameters of 8.118, 8.106, and 8.125 Å is obtained for MCo2O4, M = Co, Zn, and Ni, respectively. The transmission electron microscopy study reveals that the mesoporous rods are built by self-assembled aggregates of nanoparticles which are well-interconnected to form stable mesoporous rods. The electrochemical capacitor performance was investigated by means of cyclic voltammetry, galvanostatic charge/discharge cycling, and impedance spectroscopy in a three-electrode configuration. As a result, the spinel-type MCo2O4 rods exhibit high specific capacitances of 1846 F g–1 (CoCo2O4), 1983 F g–1 (ZnCo2O4), and 2118 F g–1 (NiCo2O4) at a scan rate of 2 mV/s. ... mehr

Volltext §
DOI: 10.5445/IR/1000075624
DOI: 10.1021/acsomega.7b00709
Zitationen: 81
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 2470-1343
KITopen-ID: 1000075624
HGF-Programm 37.01.12 (POF III, LK 01) Intercalation
Erschienen in ACS omega
Verlag American Chemical Society (ACS)
Band 2
Heft 9
Seiten 6003–6013
Nachgewiesen in Dimensions
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