Sub-nanopores-containing N,O-codoped porous carbon from molecular-scale networked polymer hydrogel for solid-state supercapacitor |
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Authors: | Meiling Wang Tianyuan Zhang Mingzhu Cui Weifeng Liu Xuguang Liu Jianwei Zhao Jiadong Zhou |
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Affiliation: | 1. Institute of New Carbon Materials, Taiyuan University of Technology, Taiyuan 030024, China;2. College of Material and Textile Engineering, Jiaxing University, Jiaxing 314001, China;3. Department of Chemistry, University of Washington, Seattle, Washington 98195, United States;4. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore;5. Institute of Crystalline Materials, Shanxi University, Taiyuan 030006, China |
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Abstract: | A template-free carbonization-activation route is developed to fabricate sub-nanopore-containing porous carbon by using a novel polypyrrole (PPy) hydrogel as a precursor. This design of PPy hydrogel precursor containing molecular-scale grids (diameter~2.0 nm) allows for homogeneous N,O-codoping into the porous carbon scaffold during the pyrolysis process. A subsequent activation step produces activated porous carbons (APCs) with tailored pore structures, which renders the APCs abundant sub-nanopores on their surface to increase the specific capacitance as extra capacitance sites. Coupled with large specific surface area and abundant heteroatoms, the optimized APC4/1 displays excellent specific capacitance of 379 F/g for liquid-state supercapacitor and 230 F/g for solid-state supercapacitor. The solid-state supercapacitor shows a high energy density of 22.99 Wh/kg at power density of 420 W/kg, which is higher than most reported porous carbon materials and satisfy the urgent requirements of elementary power source for electric vehicles. Moreover, this method can be easily modified to fabricate sub-nanopore-containing porous carbons with preferred structures and compositions for many applications. |
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Keywords: | Hydrogel Sub-nanopores Carbonization-activation Porous carbon Heteroatomdoping Solid-state supercapacitor |
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