Minimization of ion transport resistance: diblock copolymer micelle derived nitrogen-doped hierarchically porous carbon spheres for superior rate and power Zn-ion capacitors
| Autor: | Li Wang, Kai Yuan, Licheng Tan, Yiwang Chen, Zhongyou Peng, Mengke Peng, Longbin Li, Yazhou Xu, Jun Huang, Xiannong Tang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Aqueous solution Renewable Energy Sustainability and the Environment Diffusion 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Micelle 0104 chemical sciences law.invention Ion Capacitor Chemical engineering law Electrode Copolymer General Materials Science 0210 nano-technology Power density |
| Zdroj: | Journal of Materials Chemistry A. 9:8435-8443 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/d1ta01242h |
| Popis: | Although tremendous progress has been made in exploring high-energy-density aqueous Zn-ion capacitors (ZICs) recently, their rate capability and power density still remain great challenges. Herein, diblock copolymer micelle derived nitrogen-doped hierarchically porous carbon spheres (N-HPCSs) were fabricated for high energy aqueous ZICs with superior rate performance and power density. It was found that the reasonable pore size distribution and nitrogen-doping of N-HPCSs are favorable for mass transportation by smoothing and reducing the diffusion routes, leading to efficient and fast Zn-ion storage. Consequently, the as-assembled aqueous N-HPCS ZIC yielded a high capacity of 180.4 mA h g−1 at 0.5 A g−1, superior rate performance of maintaining 58.3 mA h g−1 even at an extremely high current density of 100 A g−1, a high energy density of 144.3 W h kg−1, and an excellent power density of 79.9 kW kg−1 with an ultrafast charge time of 2.1 seconds. Moreover, the aqueous N-HPCS ZIC displayed an exciting capacity retention of 98.2% after an ultra-long stability test of 50 000 cycles. This work proposes an efficient strategy to design high-performance electrodes for ZICs with ultrafast Zn-ion storage. |
| Databáze: | OpenAIRE |
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