Additive-free porous assemblies of Ti_3C_2T_x by freeze-drying for high performance supercapacitors |
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| Affiliation: | 1. Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China;2. Center for Engineering Training and Basic Experimentation, Heilongjiang University of Science and Technology, Harbin 150022, China;1. MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, PR China;2. Engineering Department, Lancaster University, Lancaster LA1 4YW, UK;1. Condensed Mater Science and Technology Institute, Department of Physics, Harbin Institute of Technology, Harbin 150001, People''s Republic of China;2. Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, People''s Republic of China;1. Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, and the College of Chemistry and Materials Science, Northwest University, Xi’an 710069, China;2. The State Key Laboratory of Solidification Processing in Northwestern Polytechnology University, Xi’an 710012, China |
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| Abstract: | ![]()
Ti_3C_2T_x has shown great potential in energy storage filed,but the restacking between Ti_3C_2T_x nanosheets seriously hampers the maximization of its capacitance.In this study,we rationally designed and synthesized porous Ti_3C_2T_x assemblies without any additive by introducing ice as spacers using a facile freeze-drying method.The porous Ti_3C_2T_x assemblies have a three-dimensional network structure,which consists of ultra large Ti_3C_2T_x lamellar walls and lots of macro-and mesopores.It has been proven that there are more-O groups on the surface of the porous Ti_3C_2T_x assemblies than the Ti_3C_2T_x film.The porous Ti_3C_2T_x assemblies deliver a maximum areal capacitance of 1668 mF/cm2 when the mass loading is 8.4 mg/cm2,an optimized specific capacitance of 247.2 F/g when the mass loading is 5.3 mg/cm2,and87% capacitance retention over 10000 cycles.The symmetric solid-state supercapacitors based on the porous Ti_3C_2T_x assemblies show an areal capacitance of 355.8 mF/cm2,the maximum power density of50 mW/cm2 and an outstanding flexibility under different deformation. |
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| Keywords: | MXenes Supercapacitor Freeze-drying Additive-free |
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