Issue 36, 2017

Phase engineering of cobalt hydroxides using 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 a reducing agent. 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 a magnetic field, raft-like nanostructures were obtained, composed of rod-like β-Co(OH)2 with a length of about 1.5 μm. The applied magnetic field was believed to provide a phase transition driving force and promote the phase transition from β-Co(OH)2 to α-Co(OH)2. When evaluated as an electrode material for supercapacitors, the as-obtained sheet-like α-Co(OH)2 exhibited higher capacitance and better cycling stability than β-Co(OH)2 prepared in the absence of a magnetic field.

Graphical abstract: Phase engineering of cobalt hydroxides using magnetic fields for enhanced supercapacitor performance

Supplementary files

Article information

Article type
Paper
Submitted
27 Apr 2017
Accepted
11 Aug 2017
First published
11 Aug 2017

J. Mater. Chem. A, 2017,5, 19203-19209

Phase engineering of cobalt hydroxides using 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, 5, 19203 DOI: 10.1039/C7TA03656F

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