Designing g-C3N4/N-Rich Carbon Fiber Composites for High-Performance Potassium-Ion Hybrid Capacitors
Designing g-C3N4/N-Rich Carbon Fiber Composites for High-Performance Potassium-Ion Hybrid Capacitors
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设计用于高性能钾离子混合电容器的 g-C3N4/富氮碳纤维复合材料
DOI：
10.1002/eem2.12148
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发表时间：
2021
影响因子：
15
通讯作者：
Zhang Ming
中科院分区：
文献类型：
--
作者：
Shen Qing;Jiang Pengjie;He Hongcheng;Feng Yanhong;Cai Yong;Lei Danni;Cai Mengqiu;Zhang Ming
钾基储能器件具有丰富的钾资源和较高的电解液迁移率，被认为是一种很有希望的储能材料。尽管现有的碳基PIBS负极材料表现出很大的钾离子存储潜力、较差的倍率性能和较差的循环寿命，但它也不能与电容器正极的动力学和稳定性相匹配。氮掺杂已被证明是提高碳材料电化学性能的一种有效的改性策略。因此，我们制备了高氮含量(19.78at%)的碳纳米纤维和g-C3N4复合材料，且吡咯氮和吡啶氮之和高达59.51%。作为PIB的负极，它具有较高的放电容量(391mAh g−1 at 0.05 A g−1)、倍率容量(141mAh g−1 at 2 A g−1)和长循环性能(201 mah g−1 at 1 A g−1超过3000个循环)。此外，作为具有活性碳阴极的钾离子混合电容器(PIHC)设备的电池负极，它还具有能量/功率密度(62和2102 W kg−1)以及高可逆容量(106 mAh g−1at 1 A g−1)。
Potassium‐based energy storage devices (PEDS) are considered as hopeful candidates for energy storage applications because of the abundant potassium resources in nature and high mobility in the electrolyte. although carbon materials show great potential for potassium‐ion storage, poor rate performance, and unsatisfactory cycle lifespan in existing carbon‐based PIBs anode, it also cannot match the dynamics and stability of the capacitor cathode. Nitrogen doping has been proven to be a effective modification strategy to improve the electrochemical performance of carbon materials. Hence, we prepare carbon nanofibers and g‐C3N4composites with high nitrogen contents (19.78 at%); moreover, the sum of pyrrolic N and pyridinic N is up to 59.51%. It achieves high discharge capacity (391 mAh g−1at 0.05 A g−1), rate capacity (141 mAh g−1at 2 A g−1), and long cycling performance (201 mAh g−1at 1 A g−1over 3000 cycles) when as an anode for PIBs. Furthermore, it can deliver promising discharge capacity of 132 mAh g−1at 0 °C. Moreover, as battery anode for potassium‐ion hybrid capacitors (PIHC) device with an active carbon cathode, it delivers energy/power density (62 and 2102 W kg−1) as well as high reversible capacity (106 mAh g−1at 1 A g−1).