The interlayer space of the layered materials is not always the electrochemical active area for contributing to the pseudocapacitive process. To our knowledge, few efforts have been devoted to investigating the effect...The interlayer space of the layered materials is not always the electrochemical active area for contributing to the pseudocapacitive process. To our knowledge, few efforts have been devoted to investigating the effect of interlayer distance of layered double hydroxides（LDHs） on pseudocapacitors. Here, we obtained the CoAl-LDH with different interlayer distance via the reaction in aqueous media hydrothermally. Electrochemical characterization reveals that the CoAl（DS^-（dodecyl sulfate））-LDHs with an interlayer distance of 2.58 nm can deliver higher specific capacitance of 1481.7 F g^-1 than CoAl（SO4^2-）-LDH（0.87 nm, 1252.7 F g^-1） and CoAl（CO3^2-）-LDH（0.76 nm, 1149.2 Fg^-1） at a discharge current density of 1 A g^-1. An asymmetric supercapacitor with the CoAl（DS^-）-LDHs‖activated carbon also shows a better electrochemical performance, including a high energy density of54.2 W h kg^-1 at a power density of 0.9 kW kg^-1 and a longterm stability, in comparison with CoAl（SO4^2-）-LDH and CoAl（CO3^2-）-LDH ‖activated carbon.展开更多
基金financially supported by the National Natural Science Foundation of China (21501152,21571159,21671178,21441003,51521091 and 51525206)China Postdoctoral Science Foundation (2017M611282)+5 种基金Program for Changjiang Scholars and Innovative Research Team in University (IRT15R61)Ministry of Science and Technology of China (2016YFA0200100 and 2016YBF0100100)Foundation of Zhengzhou University of Light Industry (2014BSJJ054)Strategic Priority Research Program of the Chinese Academy of Sciences (XDA09010104)Projects for Public Entrepreneurship and Public Innovation of ZZULI (2017ZCKJ215)Key Program of Henan Province for Science and Technology (162102210212)
文摘The interlayer space of the layered materials is not always the electrochemical active area for contributing to the pseudocapacitive process. To our knowledge, few efforts have been devoted to investigating the effect of interlayer distance of layered double hydroxides（LDHs） on pseudocapacitors. Here, we obtained the CoAl-LDH with different interlayer distance via the reaction in aqueous media hydrothermally. Electrochemical characterization reveals that the CoAl（DS^-（dodecyl sulfate））-LDHs with an interlayer distance of 2.58 nm can deliver higher specific capacitance of 1481.7 F g^-1 than CoAl（SO4^2-）-LDH（0.87 nm, 1252.7 F g^-1） and CoAl（CO3^2-）-LDH（0.76 nm, 1149.2 Fg^-1） at a discharge current density of 1 A g^-1. An asymmetric supercapacitor with the CoAl（DS^-）-LDHs‖activated carbon also shows a better electrochemical performance, including a high energy density of54.2 W h kg^-1 at a power density of 0.9 kW kg^-1 and a longterm stability, in comparison with CoAl（SO4^2-）-LDH and CoAl（CO3^2-）-LDH ‖activated carbon.
