Soft- to network hard-material for constructing both ion- and electron-conductive hierarchical porous structure to significantly boost energy density of a supercapacitor.
Soft-material PEDOT is used to network hard Co3O4nanowires for constructing both ion- and electron-conductive hierarchical porous structure Co3O4/PEDOT to greatly boost the capacitor energy density than sum of that of plain Co3O4nanowires and PEDOT film. Specifically, the networked hierarchical porous structure of Co3O4/PEDOT is synthesized and tailored through hydrothermal method and post-electrochemical polymerization method for the PEDOT coating onto Co3O4nanowires. Typically, Co3O4/PEDOT supercapacitor gets a highest areal capacitance of 160mFcm-2at a current density of 0.2mAcm-2, which is about 2.2 times larger than the sum of that of plain Co3O4NWs (0.92mFcm-2) and PEDOT film (69.88mFcm-2). Besides, if only PEDOT as active mass is counted, Co3O4/PEDOT cell can achieve a highest capacitance of 567.21Fg-1, this is the highest capacitance value obtained by PEDOT-based supercapacitors. Furthermore, this soft-hard network porous structure also achieves a high cycling stability of 93% capacitance retention after the 20,000th cycle. This work demonstrates a new approach to constructing both ion and electron conductive hierarchical porous structure to significantly boost energy density of a supercapacitor.
Institute for Clean Energy & Advanced Materials, Faculty of Materials and Energy, Southwest University, Chongqing 400715, PR China; Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Electrical Power Sources, Chongqing 400715, PR China; Institute of Materials Science and Devices, Suzhou University of Science and Technology, Suzhou 215011, PR China.
Pingping
P
Yang
Institute for Clean Energy & Advanced Materials, Faculty of Materials and Energy, Southwest University, Chongqing 400715, PR China; Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Electrical Power Sources, Chongqing 400715, PR China; Institute of Materials Science and Devices, Suzhou University of Science and Technology, Suzhou 215011, PR China; Key Laboratory of Luminescent and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, Chongqing 400715, PR China.
Jiale
J
Xie
Institute for Clean Energy & Advanced Materials, Faculty of Materials and Energy, Southwest University, Chongqing 400715, PR China; Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Electrical Power Sources, Chongqing 400715, PR China; Institute of Materials Science and Devices, Suzhou University of Science and Technology, Suzhou 215011, PR China.
Chunxian
C
Guo
Institute for Clean Energy & Advanced Materials, Faculty of Materials and Energy, Southwest University, Chongqing 400715, PR China; Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Electrical Power Sources, Chongqing 400715, PR China; Institute of Materials Science and Devices, Suzhou University of Science and Technology, Suzhou 215011, PR China. Electronic address: ecmli@swu.edu.cn.
Chang Ming
CM
Li
Electron conductivity; Hierarchical porous structure; Ion transport; PEDOT; Soft-hard network; Supercapacitor