Two-dimensional (2D) reduced graphene oxide (rGO) is often combined with metal oxides for energy-storage applications, owing to its unique properties. Here, we compare the electrochemical performance of Nb2O5-rGO and amorphous carboncoated-Nb2O5 composites, synthesized in similar conditions. The composite made of Nb2O5 and amorphous carbon (using 1,3,5- triphenylbenzene as carbon source) outperforms the Nb2O5-rGO counterpart as a high rate anode electrode material in Li-ion and Na-ion half-cells and hybrid supercapacitors, delivering specific capacities of 134 mAhg 1 at 25 C against 98 mAhg 1 for the rGO-based composite (in Li electrolyte) and 125 mAhg 1 at 20 C against 98 mAhg 1 (in Na electrolyte). The organic molecules, which are the precursor of the amorphous carbon, control the size and coat the metal oxide particles more efficiently, leading to more extensive carbon-oxide contacts, which benefits the energy-storage performa

Comparing the Performance of Nb2O5 Composites with Reduced Graphene Oxide and Amorphous Carbon in Liand Na-Ion Electrochemical Storage Devices

Claudia Triolo;Saveria Santangelo;
2020-01-01

Abstract

Two-dimensional (2D) reduced graphene oxide (rGO) is often combined with metal oxides for energy-storage applications, owing to its unique properties. Here, we compare the electrochemical performance of Nb2O5-rGO and amorphous carboncoated-Nb2O5 composites, synthesized in similar conditions. The composite made of Nb2O5 and amorphous carbon (using 1,3,5- triphenylbenzene as carbon source) outperforms the Nb2O5-rGO counterpart as a high rate anode electrode material in Li-ion and Na-ion half-cells and hybrid supercapacitors, delivering specific capacities of 134 mAhg 1 at 25 C against 98 mAhg 1 for the rGO-based composite (in Li electrolyte) and 125 mAhg 1 at 20 C against 98 mAhg 1 (in Na electrolyte). The organic molecules, which are the precursor of the amorphous carbon, control the size and coat the metal oxide particles more efficiently, leading to more extensive carbon-oxide contacts, which benefits the energy-storage performa
2020
NA ION STORAGE
SODIUM INSERTION
FACILE SYNTHESIS
ANODE MATERIALS
ENERGY STORAGE
LITHIUM
NANOCOMPOSITES
NANOCRYSTALS
ELECTRODES
NIOBIUM OXIDE
AMORPHOUS CARBON
REDUCED GRAPHENE OXIDE
LI ION STORAGE
REDUCTION
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12318/58495
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