Abstract
Hybrid sodiumion capacitors (SICs) bridge the gap between the supercapacitors (SCs) and batteries and have huge potential applications in large-scale energy storage. However, designing appropriate anode materials with fast kinetics behavior as well as long cycle life to match with the cathode electrodes remains a crucial challenge. Herein, Nb2O5 nanotubes and nanowire-to-nanotube homo-junctions were directly grown on the carbon cloth (CC) via a simple hydrothermal process through regulating the pH value of solution. The as-prepared Nb2Os@CC nanotubes displayed a high reversible capacity of 175 mA h g at the current density of 1 A g with the coulombic efficiency of 97% after 1500 cycles. Besides, the SICs fabricated with Nb2Os@CC and activated carbon (AC) electrode materials showed a high energy density of 195 W h kg ' at 120 W kg”1, a power density of 7328 W kg ' at 28 W h kg and 80% of the capacitance retention after 5000 cycles. Additionally, the flexible SIC devices can operate normally at various bendable conditions. The Nb2Os@CC nanotubes in this work can be promising electrode materials in flexible and wearable energy storage devices.
摘要
钠离子混合电容器是连接超级电容器与电池之间的桥梁, 在 大规模储能领域中具有广阔的应用前景. 然而, 设计出能够与正极 材料相匹配, 并且兼具快速动力学行为和长循环寿命的负极材料 仍然是目前面临的重要挑战之一. 本文通过简单的水热工艺, 通过 调节溶液的pH值, 可以将Nb2O5纳米管以及纳米线/纳米管同质结 直接生长在碳布(CC) 上. 所制备的Nb2O5@CC纳米管在1500次循 环后, 电流密度为1 A g−1时表现出175 mA h g−1的高可逆容量以及 97%的库伦效率. 以Nb2O5@CC为负极、活性炭为正极制备的钠离 子混合电容器的能量密度和功率密度分别可达到195 W h kg−1和 7328 W kg−1. 即使在5000次循环后仍然具有80%的电容保持率. 另 外, 该柔性`容器可以在各种可弯曲条件下正常工作. 因此, Nb2O5@CC纳米管在未来有望成为一种柔性可穿戴能源存储 器的理想电极材料.
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Rui Jia received her BE degree in 2015 from Huaqiao University and ME degree in 2018 from Qingdao University. She is a PhD candidate at the College of Mathematics and Physics, University of Science and Technology Beijing, China. Her research interests mainly focus on sodiumion batteries and hybrid supercapacitors.
Guozhen Shen received his BSc degree (1999) in chemistry from Anhui Normal University and PhD degree (2003) in chemistry from the University of Science and technology of China. He joined the Institute of Semiconductors, Chinese Academy of Sciences as a Professor in 2013. His current research focuses on the flexible electronics and printable electronics, including transistors, photodetectors, sensors and flexible energy storage and conversion devices.
Di Chen received her BSc degree (1999) in chemistry from Anhui Normal University and PhD degree (2005) in chemistry from the University of Science and technology of China. She joined the University of Science and Technology Beijing as a Professor in 2014. Her current research focuses on the energy storage materials and devices.
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Jia, R., Jiang, Y., Li, R. et al. Nb2O5 nanotubes on carbon cloth for high performance sodium-ion capacitors. Sci. China Mater. 63, 1171–1181 (2020). https://doi.org/10.1007/s40843-020-1278-9
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DOI: https://doi.org/10.1007/s40843-020-1278-9