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Hierarchical CuO octahedra inherited from copper metal–organic frameworks: high-rate and high-capacity lithium-ion storage materials stimulated by pseudocapacitance

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Abstract

The controllable synthesis and tailoring of the structure of metal oxide electrodes to achieve high rate capability and stability still remain formidable challenges. In this paper, a room-temperature solid–solid transformation route was introduced for the fabrication of a hierarchically structured porous CuO octahedron (HPCO) electrode by treating a copper metal–organic framework template, namely, Cu-BTC, with an alkaline solution. The HPCOs substantially inherited the morphology and size of the precursor Cu-BTC and were constructed by the assembly of many ultrathin nanosheets with average lateral sizes of ca. 250 nm. When acting as a host for the storage of Li+ ions, the as-fabricated HPCO electrode exhibited unprecedented performance that benefited from its advantageous structural features, with an ultrahigh capacity of 1201 mA h g−1 and superb high-rate performance with excellent cycling stability (1062, 615, and 423 mA h g−1 at 0.5, 2, and 5 A g−1, after 200, 400, and 400 repeated cycles, respectively). It is noteworthy that a surface redox pseudocapacitive effect contributed significantly to the high capacity and high rate of Li-ion storage of the HPCO electrode. This encouraging result may accelerate the further development of LIBs by a smart strategy for the micro/nanoengineering of metal oxide-based electrode materials.

Graphical abstract: Hierarchical CuO octahedra inherited from copper metal–organic frameworks: high-rate and high-capacity lithium-ion storage materials stimulated by pseudocapacitance

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Publication details

The article was received on 05 Apr 2017, accepted on 17 May 2017 and first published on 18 May 2017


Article type: Paper
DOI: 10.1039/C7TA02953E
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Hierarchical CuO octahedra inherited from copper metal–organic frameworks: high-rate and high-capacity lithium-ion storage materials stimulated by pseudocapacitance

    X. Hu, C. Li, X. Lou, Q. Yang and B. Hu, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA02953E

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