Electrochemically active porous carbon nanospheres prepared by inhibition of pyrolytic condensation of polymers
| Autor: | Jaehyun Kim, Dayoung Lee, Cheolho Kim, Haeli Lee, Seungjun Baek, Jun Hyuk Moon |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Proceedings of the National Academy of Sciences. 120 |
| ISSN: | 1091-6490 0027-8424 |
| Popis: | Porous carbon is a pivotal material for electrochemical applications. The manufacture of porous carbon has relied on chemical treatments (etching or template) that require processing in all areas of the carbon/carbon precursor. We present a unique approach to preparing porous carbon nanospheres by inhibiting the pyrolytic condensation of polymers. Specifically, the porous carbon nanospheres are obtained by coating a thin film of ZnO on polystyrene spheres. The porosity of the porous carbon nanospheres is controlled by the thickness of the ZnO shell, achieving a BET-specific area of 1,124 m 2 /g with a specific volume of 1.09 cm 3 /g. We confirm that under the support force by the ZnO shell, a hierarchical pore structure in which small mesopores are connected by large mesopores is formed and that the pore-associated sp 3 defects are enriched. These features allow full utilization of the surface area of the carbon pores. The electrochemical capacitive performance of porous carbon nanospheres was evaluated, achieving a high capacitance of 389 F/g at 1 A/g, capacitance retention of 71% at a 20-fold increase in current density, and stability up to 30,000 cycles. In particular, we achieve a specific area-normalized capacitance of 34.6 μF/cm 2 , which overcomes the limitations of conventional carbon materials. |
| Databáze: | OpenAIRE |
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