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Nickel/cobalt layered double hydroxide hollow microspheres with hydrangea-like morphology for high-performance supercapacitors
We report a new template synthesis of nickel/cobalt layered double hydroxides (Ni/Co-LDH) without any adscititious alkali source, oxidant and step for removal of the template. The perfect match between generation rate of Ni/Co-LDH nanoflakes and removal rate of template creates elaborate three-dimen...
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Published in: | Electrochimica acta 2015-01, Vol.152, p.530-537 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | We report a new template synthesis of nickel/cobalt layered double hydroxides (Ni/Co-LDH) without any adscititious alkali source, oxidant and step for removal of the template. The perfect match between generation rate of Ni/Co-LDH nanoflakes and removal rate of template creates elaborate three-dimensional architecture with well-defined hollow interior and hydrangea-like exterior. The unique structure improves faradaic redox reaction and mass transfer during the redox process, thus the Ni/Co-LDH electrode provides excellent electrochemical performance for supercapacitors.
•The study demonstrated a new strategy for template synthesis of Ni/Co-LDH without any adscititious alkali source, oxidant and step for removal of the template.•The perfect match between generation rate of Ni/Co-LDH nanoflakes and removal rate of SiO2 template create hollow microspheres with hydrangea-like morphology.•The unique structure of Ni/Co-LDH will greatly improve faradaic redox reaction and mass transfer during the redox process.•The Ni/Co-LDH electrode displays high specific capacitance, good charge/discharge capability, large energy density and superior cycle stability.•The study provides a prominent approach to fabricate various hollow nanomaterials for supercapacitors, Li-ion batteries, catalyst and sensors.
Electroactive materials with hollow nanostructures received great attractiveness due to large surface area, low density and superior structure permeablity. The paper reported a new template synthesis of nickel/cobalt layered double hydroxides (Ni/Co-LDH) without any adscititious alkali source, oxidant and step for removal of the template. Nickel nitrate, cobalt nitrate and SiO2 nanosphere were dispersed in an ethanol solution. Then, the mixed soution was heated at 160°C for 6h to obtain Ni/Co-LDH product. During the process, ethanol and nitrate underwent a redox reaction releasing hydroxide ions, which will react with nickel and cobalt ions to form ultrathin Ni/Co-LDH nanoflakes. Meanwhile, SiO2 template was gently dissolved by hydroxide ions. Interestingly, perfect match between generation rate of Ni/Co-LDH nanoflakes and removal rate of the template creates an elaborate three-dimensional structure with well-defined hollow interior and hydrangea-like exterior. The unique structure will greatly improve electron and mass transfer during the faradic redox reaction. The Ni/Co-LDH electrode exhibits excellent electrochemical performance for supercapacitors. Its specific capaci |
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ISSN: | 0013-4686 1873-3859 |
DOI: | 10.1016/j.electacta.2014.08.149 |