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Preparation and pseudocapacitive performance of microporous Co3O4-Co nanocomposites on Ni foam substrate

Abstract

Microporous Co nanoparticles (NPs) with pore diameter of 0.38 nm have been prepared by dealloying Co-Al alloy NPs, and they are subsequently annealed at different temperatures to synthesize a series of microporous Co3O4-Co nanocomposites as electrode material for pseudocapacitors. The NPs annealed at 423 K are made of Co3O4 and Co phases, and become pure Co3O4 after being annealed at 473 and 573 K. The pore diameter of the NPs does not change significantly with the increasing annealing temperature from 423 to 573 K, whereas the specific surface decreases from 39.25 to 26.68 m2 g-1 due to the sintering effect. The pseudocapacitive behaviors of the microporous Co3O4-Co nanocomposite are investigated by cyclic voltammograms (CV) and chronopotentiometry (CP) tests. The microporous Co3O4-Co nanocomposite annealed at 423 K exhibits outstanding pseudocapacitive performance with a superior specific capacitance (SC) value of 507 F g-1 at 1 A g-1 and a cycle life of 93%. The SC value decreases to 77 F g-1 for the sample annealed at 573 K. The charge-discharge mechanism is discussed in terms of structure and the existence of Co phase. The novel microporous material may open a new route for designing the high performance pseudocapacitors.

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Publication details

The article was received on 07 Dec 2016, accepted on 11 May 2017 and first published on 11 May 2017


Article type: Paper
DOI: 10.1039/C6NJ03828J
Citation: New J. Chem., 2017, Accepted Manuscript
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    Preparation and pseudocapacitive performance of microporous Co3O4-Co nanocomposites on Ni foam substrate

    H. Du, C. Zhou, H. Li, L. Wang, W. Qi, Y. Wu and T. Liu, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C6NJ03828J

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