Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 19, Issue 19, Pages 6027-6033Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201204588
Keywords
germanium; graphene; microwave chemistry; nanostructures; zinc
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Funding
- Natural Science Foundation of China [21271078, 51002057, 50825203]
- PCSIRT (Program for Changjiang Scholars and Innovative Research Team in University)
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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 in 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 (1463 mAh g(-1) at a current density of 100 mA g(-1)), good cyclability, and excellent rate capability (531 mAh g(-1) at a current density of 3200 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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