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Cucurbit[6]uril‐Derived Nitrogen‐Doped Hierarchical Porous Carbon Confined in Graphene Network for Potassium‐Ion Hybrid Capacitors
Advanced Science ( IF 14.3 ) Pub Date : 2020-08-26 , DOI: 10.1002/advs.202001681 Daping Qiu 1 , Jingyu Guan 1 , Min Li 1 , Cuihua Kang 1 , Jinying Wei 1 , Feng Wang 1, 2 , Ru Yang 1
Advanced Science ( IF 14.3 ) Pub Date : 2020-08-26 , DOI: 10.1002/advs.202001681 Daping Qiu 1 , Jingyu Guan 1 , Min Li 1 , Cuihua Kang 1 , Jinying Wei 1 , Feng Wang 1, 2 , Ru Yang 1
Affiliation
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Potassium‐ion hybrid capacitors (PIHCs) have attracted tremendous attention because their energy density is comparable to that of lithium‐ion batteries, whose power density and cyclability are similar to those of supercapacitors. Herein, a pomegranate‐like graphene‐confined cucurbit[6]uril‐derived nitrogen‐doped carbon (CBC@G) with ultra‐high nitrogen‐doping level (15.5 at%) and unique supermesopore‐macropores interconnected graphene network is synthesized. The carbonization mechanism of cucurbit[6]uril is verified by an in situ TG‐IR technology. In a K half‐cell configuration, CBC@G anode demonstrates a superior reversible capacity (349.1 mA h g−1 at 0.1 C) as well as outstanding rate capability and cyclability. Moreover, systematic in situ/ex situ characterizations, and theory calculations are carried out to reveal the origin of the superior electrochemical performances of CBC@G. Consequently, PIHCs constructed with CBC@G anode and KOH‐activated cucurbit[6]uril‐derived nitrogen‐doped carbon cathode demonstrate ultra‐high energy/power density (172 Wh kg−1/22 kW kg−1) and extraordinary cyclability (81.5% capacity retention for 5000 cycles at 5 A g−1). This work opens up a new application field for cucurbit[6]uril and provides an alternative avenue for the exploitation of high‐performance PIHCs.
中文翻译：
用于钾离子混合电容器的石墨烯网络中限制的葫芦[6]脲衍生的氮掺杂分级多孔碳
钾离子混合电容器（PIHC）因其能量密度与锂离子电池相当而引起了极大的关注，而锂离子电池的功率密度和循环性能与超级电容器相似。在此，合成了一种具有超高氮掺杂水平（15.5 at%）和独特的超介孔-大孔互连石墨烯网络的类石榴石墨烯限制的葫芦[6]脲衍生的氮掺杂碳（CBC@G）。通过原位TG-IR技术验证了葫芦[6]脲的碳化机理。在 K 半电池配置中，CBC@G 阳极表现出卓越的可逆容量（0.1 C 时为 349.1 mA hg -1）以及出色的倍率性能和循环性能。此外，还进行了系统的原位/异位表征和理论计算，揭示了CBC@G优异电化学性能的根源。因此，用CBC@G阳极和KOH激活的葫芦[6]脲衍生的氮掺杂碳阴极构建的PIHC表现出超高的能量/功率密度（172 Wh kg -1 /22 kW kg -1）和非凡的循环性能（ 5 A g -1下循环 5000 次后容量保持率为 81.5% 。这项工作为 cucurbit[6]uril 开辟了一个新的应用领域，并为高性能 PIHC 的开发提供了另一种途径。
更新日期：2020-10-22
中文翻译：
用于钾离子混合电容器的石墨烯网络中限制的葫芦[6]脲衍生的氮掺杂分级多孔碳
钾离子混合电容器（PIHC）因其能量密度与锂离子电池相当而引起了极大的关注，而锂离子电池的功率密度和循环性能与超级电容器相似。在此，合成了一种具有超高氮掺杂水平（15.5 at%）和独特的超介孔-大孔互连石墨烯网络的类石榴石墨烯限制的葫芦[6]脲衍生的氮掺杂碳（CBC@G）。通过原位TG-IR技术验证了葫芦[6]脲的碳化机理。在 K 半电池配置中，CBC@G 阳极表现出卓越的可逆容量（0.1 C 时为 349.1 mA hg -1）以及出色的倍率性能和循环性能。此外，还进行了系统的原位/异位表征和理论计算，揭示了CBC@G优异电化学性能的根源。因此，用CBC@G阳极和KOH激活的葫芦[6]脲衍生的氮掺杂碳阴极构建的PIHC表现出超高的能量/功率密度（172 Wh kg -1 /22 kW kg -1）和非凡的循环性能（ 5 A g -1下循环 5000 次后容量保持率为 81.5% 。这项工作为 cucurbit[6]uril 开辟了一个新的应用领域，并为高性能 PIHC 的开发提供了另一种途径。
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