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Phase and morphology evolution of ultrathin Co(OH)2 nanosheets towards supercapacitor application

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Abstract

Ultrathin α-Co(OH)2 nanosheets (NSs) were hydrothermally synthesized without using surfactants and templates. Interestingly, the ultrathin α-Co(OH)2 NSs evolved from graphene-like NSs to hexagonal nanoplates (NPs) and then transformed into a needle-like Co(CO3)0.5(OH)·0.11H2O phase with increasing reaction temperature and time. The phase and morphology evolution depended strongly on the CO32− ions in the solution. We ruled out the possibility that CO32− originated from the adsorption of CO2 in air and proposed the possible phase transition mechanism from α-Co(OH)2 to Co(CO3)0.5(OH)·0.11H2O, which was due to the decomposition of hexamethylenetetramine driven by dynamics and thermodynamics. The morphology evolution could be regarded as the dissolution–recrystallization–redissolution–recrystallization of α-Co(OH)2. The electrochemical behavior tests demonstrated that the ultrathin α-Co(OH)2 electrode exhibited an excellent specific capacitance of 833.4 F g−1 at 5 A g−1; however, the specific capacitance of the needle-like Co(CO3)0.5(OH)·0.11H2O electrode was 247.2 F g−1 at the same current density. This excellent electrochemical property is attributed to the crystalline phase and ultrathin nature of the materials.

Graphical abstract: Phase and morphology evolution of ultrathin Co(OH)2 nanosheets towards supercapacitor application

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Publication details

The article was received on 16 Jun 2017, accepted on 22 Aug 2017 and first published on 23 Aug 2017


Article type: Paper
DOI: 10.1039/C7CE01130J
Citation: CrystEngComm, 2017, Advance Article
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    Phase and morphology evolution of ultrathin Co(OH)2 nanosheets towards supercapacitor application

    K. Ding, X. Zhang, J. Li, P. Yang and X. Cheng, CrystEngComm, 2017, Advance Article , DOI: 10.1039/C7CE01130J

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