Ultraflexible Reedlike Carbon Nanofiber Membranes Decorated with Ni–Co–S Nanosheets and Fe2O3–C Core–Shell Nanoneedle Arrays as Electrodes of Flexible Quasi-Solid-State Asymmetric Supercapacitors,ACS Applied Energy Materials

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Ultraflexible Reedlike Carbon Nanofiber Membranes Decorated with Ni–Co–S Nanosheets and Fe2O3–C Core–Shell Nanoneedle Arrays as Electrodes of Flexible Quasi-Solid-State Asymmetric Supercapacitors
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-02-08 , DOI: 10.1021/acsaem.0c02700
Ming Zhang _{1,

2} , Xuwen Wu ₁ , Dongzhi Yang _{1,

2} , Liyuan Qin ₁ , Shiyi Zhang ₁ , Ting Xu ₂ , Tianyu Zhao ₂ , Zhong-Zhen Yu _{1,

2,

3}

Affiliation

Flexible and lightweight supercapacitors with satisfactory energy density and long-term stability are urgently required to provide power for flexible, foldable, and wearable electronic devices. Herein, reedlike carbon nanofibers (RCNFs) with hierarchical macropores in the core and micropores and honeycomb mesopores in the shell are designed by electrospinning, carbonization, and etching, leading to high electronic conductivity and satisfactory mechanical flexibility and foldability. Subsequently, flowerlike Ni–Co–S nanoarrays are grown in situ on RCNFs by electrodeposition, and fern leaf-like Fe₂O₃–C core–shell nanoneedles, in which porous Fe₂O₃ are coated with ultrathin carbon layers, are decorated on RCNFs via hydrothermal synthesis, polydopamine modification, and thermal annealing. Because of unique core–shell structures and synergistic effects of these active components, the RCNF@Ni–Co–S cathode and the RCNF@Fe₂O₃–C anode exhibit high specific capacitances of 1728 and 221.5 F g^–1 at 1 A g^–1, respectively. With a poly(vinyl alcohol) (PVA)/potassium hydroxide (KOH) solid gel as both an electrolyte and a separator, the assembled flexible quasi-solid-state asymmetric supercapacitor achieves a high energy density of 44.9 W h kg^–1 at 1549.7 W kg^–1, and the capacitance remains at 94% after bending the asymmetric supercapacitor to 180°. The flexible electrodes with excellent electrochemical performances are highly promising for high-performance wearable energy storage devices.

中文翻译：

Ni-Co-S纳米片和Fe ₂ O ₃ -C核-壳纳米针阵列装饰的超柔性芦苇状碳纳米纤维膜作为柔性准固态非对称超级电容器的电极

迫切需要具有令人满意的能量密度和长期稳定性的柔性轻量级超级电容器，以为柔性，可折叠和可穿戴电子设备提供电源。在此，通过电纺丝，碳化和蚀刻来设计在芯中具有分级大孔，在壳中具有微孔和蜂窝状中孔的芦苇状碳纳米纤维（RCNF），从而导致高电子传导性以及令人满意的机械柔韧性和可折叠性。随后，通过电沉积在RCNFs上原位生长花状Ni–Co–S纳米阵列，以及蕨叶状Fe ₂ O ₃ –C核-壳纳米针，其中多孔Fe ₂ O ₃涂有超薄碳层，并通过水热合成，聚多巴胺改性和热退火在RCNF上进行装饰。由于独特的核壳结构和这些活性成分的协同作用，RCNF @ Ni-Co-S阴极和RCNF @ Fe ₂ O ₃ -C阳极在1 A时显示出1728和221.5 F g ^–1的高比电容。g ^–1。通过使用聚乙烯醇（PVA）/氢氧化钾（KOH）固体凝胶作为电解质和隔板，组装后的柔性准固态非对称超级电容器在1549.7处可实现44.9 W h kg ^–1的高能量密度重量– ¹，将不对称超级电容器弯曲到180°后，电容保持在94％。具有出色电化学性能的柔性电极对于高性能可穿戴式能量存储设备具有很高的前景。

更新日期：2021-02-22

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