Abstract
Abstract An easy and facile hydrothermal method is presented to synthesize hybrid materials of hollow mesoporous Zn0.76Co0.24S nanospheres anchored on reduced graphene oxide (rGO) sheets (Zn0.76Co0.24S@N/S-rGO), in which the obtained Zn0.76Co0.24S nanospheres are composed of numerous nanoparticles. Being evaluated as anode materials for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs), the Zn0.76Co0.24S@N/S-rGO composites exhibited a high reversible capacity of 804 and 605 mA h g−1 at the current density of 1 A g−1 after 500 cycles for LIBs and SIBs, respectively. The excellent electrochemical performance of Zn0.76Co0.24S@N/S-rGO composites originates from the synergistic effect between hollow Zn0.76Co0.24S nanospheres and reduction graphene, as well as the void spaces between the neighbouring nanoparticles of Zn0.76Co0.24S providing large contact areas with electrolyte and buffer zone to accommodate the volume variation during the cycling process.
Highlights
An easy and facile hydrothermal method is presented to synthesize hybrid materials of hollow mesoporous Zn0.76Co0.24S nanospheres anchored on reduced graphene oxide sheets (Zn0.76Co0.24S@N/S-rGO), in which the obtained Zn0.76Co0.24S nanospheres are composed of numerous nanoparticles
The morphologies of Zn0.76Co0.24S nanospheres and Zn0.76Co0.24S@N/S-rGO composite were investigated via scanning electron microscope (SEM) and transmission electron microscope (TEM)
The size of Zn0.76Co0.24S nanospheres (Figure S1) is obviously larger than that of Zn0.76Co0.24S@N/S-rGO, which implies that the introduction of graphene could limit the size of nanospheres
Summary
Abstract: An easy and facile hydrothermal method is presented to synthesize hybrid materials of hollow mesoporous Zn0.76Co0.24S nanospheres anchored on reduced graphene oxide (rGO) sheets (Zn0.76Co0.24S@N/S-rGO), in which the obtained Zn0.76Co0.24S nanospheres are composed of numerous nanoparticles. Hollow-structured materials have drawn great attention and proven to be efficient way to accommodate the volume fluctuation of transitional metal chalcogenides during cycling [13] Such unique structures can provide large electrolyte/electrode contact area for rapid ion diffusion and reaction, and effectively buffer the dramatic volumetric changes during electrochemical reactions. We demonstrated a facile and efficient hydrothermal synthesis method to prepare hollow-structured Zn0.76Co0.24S nanospheres anchored on rGO as anodes materials of LIBs and SIBs. The obtained Zn0.76Co0.24S@N/ S-rGO composite delivers high discharge capacities of 1,265 and 672 mA h g−1 at a current density of 0.1 A g−1 for LIBs and SIBs, respectively. The in situ sulfur doping can increase the capacity, and improve the electrochemical properties of the carbon materials [16]
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