465633 Synthesis of Hollow Co3O4 Nanoparticles on Nitrogen–Doped Porous Carbons for High-Performance Supercapacitors

Wednesday, November 16, 2016: 12:30 PM
Continental 1 (Hilton San Francisco Union Square)
Gi Mihn Kim, Chem. & Biomolecular, KAIST, Daejeon, South Korea, Jae Hyun Park, Chemical & Biomolecular Engineering, Korea Advanced Institute of Science & Technology (KAIST), Daejeon, Korea, The Republic of and Jae W. Lee, Department of Chemical & Biomolecular Engineering, KAIST, Daejeon, Korea, The Republic of

Supercapacitors have been considered as next generation energy storage devices due to their high power density caused by rapid charge/discharge rates, long life cycle and eco-friendliness. In view of electrode materials, several strategies to improve performance of the supercapacitors were suggested and applied. We incorporated Co3O4 nanoparticles into nitrogen-doped porous carbons to investigate their potential as supercapacitors. The nano-sized Co3O4 particles grow and their morphology becomes hollow on the carbon support, which is attributed to the atomic diffusion (the Kirkendall effect) during the annealing. The cobalt-doped composites have high BET surface areas of about 3000 m2 g-1 and possess mesopore-dominant structures caused by the hollow Co3O4 nanoparticles. As a result, the hollow Co3O4 in the composites simultaneously induces both enhanced pseudo-capacitance and efficient pore structure for energy storage. The specific capacitance of the composites is as high as 300 F g-1 in an aqueous solution of 6 M KOH at 1 A g-1, and the material shows competitive specific capacitance of 210 F g-1 at 10 A g-1 for a high power density. The present study provides a unique insight into the synthesis of hollow nanoparticles on a porous substrate material for high-performance supercapacitance.

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