Scalable and sustainable synthesis of carbon microspheres via a purification-free strategy for sodium-ion capacitors
Publication in refereed journal


摘要Sodium-based energy storage receives a great deal of interest due to the virtually inexhaustible sodium reserve, while the scalable and sustainable strategies to synthesize carbon-based materials with suitable interlayer spaces and large sodium storage capacities are yet to be fully investigated. Carbon microspheres, with regular geometry, non-graphitic characteristic, and stable nature are promising candidates, yet the synthetic methods are usually complex and energy consuming. In this regard, we report a scalable purification-free strategy to synthesize carbon microspheres directly from 5 species of fresh juice. As-synthesized carbon microspheres exhibit dilated interlayer distance of 0.375 nm and facilitate Na+ uptake and release. For example, such carbon microsphere anodes have a specific capacity of 183.9 mAh g(-1) at 50 mA g(-1) and exhibit ultra-stability (99.0% capacity retention) after 10000 cycles. Moreover, via facile activation, highly porous carbon microsphere cathodes are fabricated and show much higher energy density at high rate than commercial activated carbon. Coupling the compelling anodes and cathodes above, novel sodium-ion capacitors show the high working potential up to 4.0 V, deliver a maximum energy density of 52.2 Wh kg(-1), and exhibit an acceptable capacity retention of 85.7% after 2000 cycles.
著者Shijie Wang, Rutao Wang, Yabin Zhang, Dongdong Jin, Li Zhang
期刊名稱Journal of Power Sources
頁次33 - 40
關鍵詞Sodium-ion capacitors,Carbon microspheres,Fresh juice,Scalable,Purification-free,Sustainable
Web of Science 學科類別Chemistry, Physical;Electrochemistry;Energy & Fuels;Materials Science, Multidisciplinary;Chemistry;Electrochemistry;Energy & Fuels;Materials Science

上次更新時間 2020-13-07 於 01:20