| Autor: |
Yu, Yixing, Yang, Pingping, Yan, Ruyu, Ren, Fucheng, Yu, Shuangwen, Zhang, Lingshan, Guo, Jiayi, Li, Ruirui, Xie, Jiale |
| Zdroj: |
Jouranl of Energy Storage; March 2024, Vol. 80 Issue: 1 |
| Abstrakt: |
Carbonized melamine foam (CMF) is a good candidate as the cathodic material for zinc-ion capacitor (ZIC) applications due to its robust mechanical property, porous structure, and high nitrogen content. However, the rich macropores and low surface area limit efficient storage of Zn2+. This work develops a mesopore-rich CMF based carbon material (CMF-G) by assembling CMF and graphene sheets. To further tailor the pore and surface of CMF-G, ZnCl2chemical activation, air activation, and pseudocapacitive RuO2modification are together applied to improve the energy density of CMF based ZICs. Thanks to the application of a combined strategy, the porous CMF-G@RuO2assembled Zn//CMF-G@RuO2ZIC devices without the binder and conductive additive deliver a high device capacitance of 170.4 F g−1at 0.1 A g−1and a high energy density of 60.6 Wh kg−1, along with an exceptionally high power density of 15.2 kW kg−1. This type ZICs also possess excellent anti-self-discharge performance with a self-discharge rate of only 8.0 mV h−1and remarkable cycling stability with a capacitance retention of 96.7 % at 10 A g−1after 10,000 cycles. This study demonstrates that CMF-G@RuO2is a promising cathode material for ZICs. |
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