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Phase Engineering of Cobalt Hydroxides by Magnetic Fields for Enhanced Supercapacitor Performance

Abstract

We report on the selective synthesis of single crystal sheet-like α-Co(OH)2 and raft-like nanostructures of β-Co(OH)2 hydrothermally using hydrazine as reductive agent. The α-Co(OH)2 sheets of several micrometers in width and about 20 nm in thickness were reproducibly yielded in the presence of an applied strong magnetic field (2 Tesla) at 180 °C. In the absence of magnetic field, raft-like nanostructures were obtained, composed of rod-like β-Co(OH)2 with length about 1.5 μm. The applied magnetic field was believed to provide phase transition driving force, and promote the phase transition from β-Co(OH)2 to α-Co(OH)2. When evaluated as electrode materials for supercapacitor, the as-obtained sheet-like α-Co(OH)2 exhibited higher capacitance and better cycling stability than that of β-Co(OH)2 prepared in the absence of magnetic field.

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Publication details

The article was received on 27 Apr 2017, accepted on 11 Aug 2017 and first published on 11 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA03656F
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Phase Engineering of Cobalt Hydroxides by Magnetic Fields for Enhanced Supercapacitor Performance

    P. Dai, T. Yan, L. Hu, Z. Pang, Z. Bao, M. Wu, G. Li, J. Fang and Z. Peng, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03656F

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