Microwave-Induced inâ
situ synthesis of Zn2GeO4/N-doped graphene nanocomposites and their lithium-storage properties.
Chemistry
; 19(19): 6027-33, 2013 May 03.
Article
en En
| MEDLINE
| ID: mdl-23495087
ABSTRACT
Zn2GeO4/N-doped graphene nanocomposites have been synthesized through a fast microwave-assisted route on a large scale. The resulting nanohybrids are comprised of Zn2GeO4 nanorods that are well-embedded in N-doped graphene sheets by inâ
situ reducing and doping. Importantly, the N-doped graphene sheets serve as elastic networks to disperse and electrically wire together the Zn2GeO4 nanorods, thereby effectively relieving the volume-expansion/contraction and aggregation of the nanoparticles during charge and discharge processes. We demonstrate that an electrode that is made of the as-formed Zn2GeO4/N-doped graphene nanocomposite exhibits high capacity (1463â
mA h g(-1) at a current density of 100â
mA g(-1)), good cyclability, and excellent rate capability (531â
mA h g(-1) at a current density of 3200â
mA g(-1)). Its superior lithium-storage performance could be related to a synergistic effect of the unique nanostructured hybrid, in which the Zn2GeO4 nanorods are well-stabilized by the high electronic conduction and flexibility of N-doped graphene sheets. This work offers an effective strategy for the fabrication of functionalized ternary-oxide-based composites as high-performance electrode materials that involve structural conversion and transformation.
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2013
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Article