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Nanoflakes Decorated Hollow Mesoporous Co3O4 Superstructures for Electrochemical Capacitors

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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.
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Keywords: Co3O4; Hollow Structure; Nanostructure; Nanothin Wall; Supercapacitors; Superstructures

Document Type: Research Article

Affiliations: Department of Chemical Engineering, College of Engineering, Kyung Hee University, 1 Seochon, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea

Publication date: December 1, 2016

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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