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Preparation of CoAl layered double hydroxide nanoflake arrays and their high supercapacitance performance
Abstract Porous cobalt aluminum layered double hydroxide (CoAl-LDH) nanoflake arrays on nickel foam were synthesized by a facile hydrothermal synthesis method. The obtained CoAl-LDH film consisted of interconnected nanoflakes with the thicknesses of ~20nm and showed an extended net-like structure. The electrochemical performance of CoAl-LDH nanoflake arrays was tested by cyclic voltammetry and galvanostatic charge/discharge test. The porous CoAl-LDH nanoflake arrays showed good pseudocapacitive performances with high capacitance and good cycle stability. At room temperature, the porous CoAl-LDH nanoflake arrays exhibited a high specific capacitance of 930F/g at 2A/g and their specific capacitances were still up to 669F/g at 16A/g. A good cycling stability was also observed for the CoAl-LDH nanoflake arrays with a capacitance retention of 88.9% of the highest value after 2000cycles at 2A/g.
Highlights Porous CoAl-LDH nanoflake arrays are synthesized by a hydrothermal method. The CoAl-LDH arrays show good pseudocapacitive performances. High supercapacitance mainly due to its upstanding nanoflake structure
Preparation of CoAl layered double hydroxide nanoflake arrays and their high supercapacitance performance
Abstract Porous cobalt aluminum layered double hydroxide (CoAl-LDH) nanoflake arrays on nickel foam were synthesized by a facile hydrothermal synthesis method. The obtained CoAl-LDH film consisted of interconnected nanoflakes with the thicknesses of ~20nm and showed an extended net-like structure. The electrochemical performance of CoAl-LDH nanoflake arrays was tested by cyclic voltammetry and galvanostatic charge/discharge test. The porous CoAl-LDH nanoflake arrays showed good pseudocapacitive performances with high capacitance and good cycle stability. At room temperature, the porous CoAl-LDH nanoflake arrays exhibited a high specific capacitance of 930F/g at 2A/g and their specific capacitances were still up to 669F/g at 16A/g. A good cycling stability was also observed for the CoAl-LDH nanoflake arrays with a capacitance retention of 88.9% of the highest value after 2000cycles at 2A/g.
Highlights Porous CoAl-LDH nanoflake arrays are synthesized by a hydrothermal method. The CoAl-LDH arrays show good pseudocapacitive performances. High supercapacitance mainly due to its upstanding nanoflake structure
Preparation of CoAl layered double hydroxide nanoflake arrays and their high supercapacitance performance
Guoxiang, Pan (author) / Xinhui, Xia (author) / Jingshan, Luo (author) / Feng, Cao (author) / Zhihong, Yang (author) / Hongjin, Fan (author)
Applied Clay Science ; 102 ; 28-32
2014-10-09
5 pages
Article (Journal)
Electronic Resource
English
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