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A Dual-Carbon Potassium-Ion Capacitor Enabled by Hollow Carbon Fibrous Electrodes with Reduced Graphitization
Advanced Materials ( IF 27.4 ) Pub Date : 2024-07-20 , DOI: 10.1002/adma.202406794 Xiaojun Shi 1 , Huanwen Wang 1 , Zeren Xie 1 , Zhifei Mao 1 , Taoqiu Zhang 1 , Jun Jin 1 , Beibei He 1 , Rui Wang 1 , Yansheng Gong 1 , Hong Jin Fan 2
Advanced Materials ( IF 27.4 ) Pub Date : 2024-07-20 , DOI: 10.1002/adma.202406794 Xiaojun Shi 1 , Huanwen Wang 1 , Zeren Xie 1 , Zhifei Mao 1 , Taoqiu Zhang 1 , Jun Jin 1 , Beibei He 1 , Rui Wang 1 , Yansheng Gong 1 , Hong Jin Fan 2
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The large size of K+ ions (1.38 Å) sets a challenge in achieving high kinetics and long lifespan of potassium storage devices. Here, a fibrous ZrO2 membrane is utilized as a reactive template to construct a dual-carbon K-ion capacitor. Unlike graphite, ZrO2-catalyzed graphitic carbon presents a relatively disordered layer arrangement with an expanded interlayer spacing of 0.378 nm to accommodate K+ insertion/extraction. Pyridine-derived nitrogen sites can locally store K-ions without disrupting the formation of stage-1 graphite intercalation compounds (GICs). Consequently, N-doped hollow graphitic carbon fiber achieves a K+-storage capacity (primarily below 1 V), which is 1.5 time that of commercial graphite. Potassium-ion hybrid capacitors are assembled using the hollow carbon fiber electrodes and the ZrO2 nanofiber membrane as the separator. The capacitor exhibits a high power of 40 000 W kg−1, full charge in 8.5 s, 93% capacity retention after 5000 cycles at 2 A g−1, and a low self-discharge rate of 8.6 mV h−1. The scalability and high performance of the lattice-expanded tubular carbon electrodes underscores may advance the practical potassium-ion capacitors.
中文翻译：
一种由减少石墨化的中空碳纤维电极实现的双碳钾离子电容器
K +离子的大尺寸 (1.38 Å) 对实现钾存储装置的高动力学和长寿命提出了挑战。在这里，纤维状ZrO 2膜被用作反应模板来构建双碳K离子电容器。与石墨不同，ZrO 2催化的石墨碳呈现相对无序的层排列，具有0.378nm的扩大的层间距以适应K +插入/脱出。吡啶衍生的氮位点可以局部存储钾离子，而不破坏第一阶段石墨插层化合物（GIC）的形成。因此，N掺杂中空石墨碳纤维实现了K +存储容量（主要低于1V），是商用石墨的1.5倍。使用中空碳纤维电极和ZrO 2纳米纤维膜作为隔膜组装了钾离子混合电容器。该电容器表现出40 000 W kg -1的高功率、8.5 s内充满电、2 A g -1循环5000次后容量保持率为93%以及8.6 mV h -1的低自放电率。晶格膨胀管状碳电极的可扩展性和高性能可能会推动钾离子电容器的实用化。
更新日期：2024-07-20
中文翻译：
一种由减少石墨化的中空碳纤维电极实现的双碳钾离子电容器
K +离子的大尺寸 (1.38 Å) 对实现钾存储装置的高动力学和长寿命提出了挑战。在这里，纤维状ZrO 2膜被用作反应模板来构建双碳K离子电容器。与石墨不同，ZrO 2催化的石墨碳呈现相对无序的层排列，具有0.378nm的扩大的层间距以适应K +插入/脱出。吡啶衍生的氮位点可以局部存储钾离子，而不破坏第一阶段石墨插层化合物（GIC）的形成。因此，N掺杂中空石墨碳纤维实现了K +存储容量（主要低于1V），是商用石墨的1.5倍。使用中空碳纤维电极和ZrO 2纳米纤维膜作为隔膜组装了钾离子混合电容器。该电容器表现出40 000 W kg -1的高功率、8.5 s内充满电、2 A g -1循环5000次后容量保持率为93%以及8.6 mV h -1的低自放电率。晶格膨胀管状碳电极的可扩展性和高性能可能会推动钾离子电容器的实用化。
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