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Co3O4 Nanoparticles Embedded in Mesoporous Carbon for Supercapacitor Applications

Abstract : Metal oxides are of great interest for supercapacitor application; however, they suffer from capacity fading during cycling and limited cycle life. In this work, a one-pot bottom-up approach is proposed to design cobalt oxide (Co 3 O 4) nanoparticles confined in a mesoporous carbon. This involved the coassembly of a phenolic resin, a surfactant, and a cobalt salt followed by a high temperature pyrolysis (600−800°C) and a subsequent low temperature oxidation (190−240°C) step. Very small Co 3 O 4 particle size (2.3−7.4 nm) could be achieved for high loadings of Co 3 O 4 (up to 59%) in the carbon network. Both the pyrolysis and oxidation temperature increase led to an increase of nanoparticle size, porosity and electronic conductivity. At low temperatures, i.e., 600 and 650°C , and despite the low particle size, the performances are poor and limited by the carbon low electronic conductivity. At high temperature (800°C), the conductivity is improved translating in a higher capacitance, but the larger and more aggregated nanoparticles induced low rate capability. The best compromise to maintain high capacitance and rate capability was observed at 700 and 750°C and thus for composite materials combining simultaneously dispersed nanoparticles, high porosity, and good electronic conductivity. In particular, the material treated at 750°C presents, in a 2 electrode system using 2 M KOH, a capacitance of 54 F g −1 at 0.1 A g −1 , a very high rate capability of 48.7% at 10 A g −1 , and a superior rate performance of 82% after 10000 cycles.
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https://hal.archives-ouvertes.fr/hal-03320716
Contributor : Camelia Ghimbeu Connect in order to contact the contributor
Submitted on : Monday, November 29, 2021 - 9:42:05 AM
Last modification on : Tuesday, January 4, 2022 - 6:41:50 AM

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Sirine Zallouz, Bénédicte Réty, Loïc Vidal, Jean-Marc Le Meins, Camélia Ghimbeu. Co3O4 Nanoparticles Embedded in Mesoporous Carbon for Supercapacitor Applications. ACS Applied Nano Materials, American Chemical Society, 2021, 4 (5), pp.5022-5037. ⟨10.1021/acsanm.1c00522⟩. ⟨hal-03320716⟩

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