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Issue 38, 2014
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Three-dimensional multilevel porous thin graphite nanosuperstructures for Ni(OH)2-based energy storage devices

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Abstract

We report an innovative mechanism for the synthesis of 3-D multilevel porous graphite superstructures using strategically engineered Cu–Ni catalysts. The 3-D thin-graphite nanostructures with two levels of porosity were synthesized by using porous nickel–copper (Ni–Cu) catalysts—engineered from Ni foams via an electrodeposition/etching process. The as-grown graphite is 3-D, multilevel porous, freestanding, and flexible after selective etching of the catalysts. The graphite coated with thin nickel hydroxide nanoplates [Ni(OH)2] was applied as electrodes for alkaline batteries. The electrodes are binder-free and offer a remarkable discharge capacity of ∼480 mA h g−1 at a rate of 1.5 A g−1. Compared to previous reports, they also exhibit excellent cyclability with 97.5% capacitance retention after 4000 cycles. The high performance of the electrodes of porous graphite/Ni(OH)2 could be attributed to the large specific surface area, excellent crystalline quality, controlled Ni(OH)2 nanocrystalline assemblies, and high electric conductivity. Overall, the reported mechanism for the synthesis of 3-D porous graphite is the first of its kind, which may potentially spur a new paradigm for manufacturing 3-D porous graphene/graphite materials for an array of energy storage applications.

Graphical abstract: Three-dimensional multilevel porous thin graphite nanosuperstructures for Ni(OH)2-based energy storage devices

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Publication details

The article was received on 25 May 2014, accepted on 17 Jul 2014 and first published on 18 Jul 2014


Article type: Paper
DOI: 10.1039/C4TA02617A
J. Mater. Chem. A, 2014,2, 15768-15773

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    Three-dimensional multilevel porous thin graphite nanosuperstructures for Ni(OH)2-based energy storage devices

    J. Ning, X. Xu, C. Liu and D. L. Fan, J. Mater. Chem. A, 2014, 2, 15768
    DOI: 10.1039/C4TA02617A

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