科研之友
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摘要
Hierarchical structures of metal oxides are extremely crucial for the advancement of energy storage materials. Herein, we report a simple template free method for the synthesis of hierarchical superstructure consisting of hollow mesoporous Co3O4 nanostructures decorated by nanoflakes. Each hollow particle is outfitted with dual-faced nanoscale thin walls with a uniform thickness of 50-80 nm and the outer surface is covered by flake like nanostructures with a thickness of 10 nm. In addition, the method yields gram quantities with highly reproducible structures. The as-obtained Co3O4 electrodes with distinct hollow superstructures are applied into an electrode for electrochemical capacitors (ECs), revealing high specific capacitance of about 302 F.g(-1) at 1 A.g(-1). Capacitive performances of hollow mesoporous Co3O4 such as cycle life and rate capability are evaluated to compare with those of control sample and previous results. A symmetric EC device is fabricated, exhibiting prominent cycle performance with less than 8% capacitance loss after 5000 charge-discharge cycles.
- 出版日期2016-12
