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Three-dimensional(3D) flower-like Co–Al layered double hydroxide(Co–Al-LDH) architectures composed of atomically thin nanosheets were successfully synthesized via a hydrothermal method in a mixed solvent of water and butyl alcohol. Owing to the unique hierarchical structure and modification by butyl alcohol, the electrochemical stability and the charge/mass transport of the Co–Al-LDHs was improved. When used in supercapacitors, the obtained Co–Al-LDHs deliver a high specific capacitance of 838 Fg~(-1) at a current density of 1 Ag~(-1)and excellent rate performance(753 Fg~(-1) at 30 Ag~(-1) and 677 Fg~(-1) at 100 Ag~(-1)), as well as excellent cycling stability with 95% retention of the initial capacitance even after 20,000 cycles at a current density of 5 Ag~(-1). This work provides a promising alternative strategy to enhance the electrochemical properties of supercapacitors.
Three-dimensional (3D) flower-like Co-Al layered double hydroxide (Co-Al-LDH) architectures composed of atomically thin nanosheets were successfully synthesized via a hydrothermal method in a mixed solvent of water and butyl alcohol. Structure and modification by butyl alcohol, the electrochemical stability and the charge / mass transport of the Co-Al-LDHs was improved. When used in supercapacitors, the resulting Co-Al-LDHs deliver a high specific capacitance of 838 Fg ~ ) at a current density of 1 Ag ~ (-1) and excellent rate performance (753 Fg -1 at 30 Ag ~ (-1) and 677 Fg -1 at 100 Ag ~ (-1)) This work provides a promising alternative cycling to 95% retention of the initial capacitance even after 20,000 cycles at a current density of 5 Ag ~ (-1). This work provides a promising alternative energy to enhance the electrochemical properties of supercapacitors.