Flexible Cross-Linked Electrospun Carbon Nanofiber Mats Derived from Pitch as Dual-Functional Materials for Supercapacitors,Energy & Fuels

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Flexible Cross-Linked Electrospun Carbon Nanofiber Mats Derived from Pitch as Dual-Functional Materials for Supercapacitors
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-10-26 , DOI: 10.1021/acs.energyfuels.0c02847
Xiaodong Tian ₁ , Yiting He _{1,

2} , Yan Song _{1,

2} , Tao Yang _{1,

2} , Xiao Li ₃ , Zhanjun Liu _{1,

2}

Affiliation

Freestanding and binder-free electrospun carbon nanofiber mats with a cross-linked structure (CLCF) were fabricated by using pitch as the precursor. The cross-linked structure can be tuned easily by controlling the preoxidation degree of electrospun nanofibers. This cross-linking strategy can not only convert low value pitch into economical efficient energy storage materials but also reduce contact resistance and enhance ion diffusion kinetics of the as-obtained CLCF by reducing the fiber diameter, balancing porous structure, and conductivity. The CLCF electrode with a moderate preoxidation degree exhibits remarkable rate performance (160 F g^–1 at 100 A g^–1, 85.6% of its initial capacity at 1 A g^–1) in 6 M KOH aqueous electrolyte, compared with carbon nanofibers without and with an overdose of cross-linked structure. Moreover, as a scaffold for depositing NiMoO₄, impressive electrochemical performance can be achieved. The assembled asymmetrical device based on CLCF and NiMoO₄-anchored CLCF delivers a stable working voltage of 1.6 V with a high energy output of 14.9 Wh kg^–1 and a maximum power density of 14.3 kW kg^–1. The intriguing electrochemical performance can be credited to the cross-linked fibrous structure that endows the CLCF with rapid ion diffusion kinetics and fast electron transfer as well as robust structural stability to bear the volume fluctuation of NiMoO₄ during the repeated charge/discharge process. Therefore, our work provides a new strategy to design high performance carbon nanofiber mats with a cross-linked structure as a dual-functional material for supercapacitor devices by using pitch.

中文翻译：

沥青衍生的柔性交联静电纺碳纳米纤维毡，作为超级电容器的双重功能材料

以沥青为前驱体，制作了具有交联结构（CLCF）的独立式无粘结剂静电纺碳纳米纤维毡。通过控制电纺纳米纤维的预氧化程度，可以轻松调整交联结构。这种交联策略不仅可以将低值沥青转化为经济高效的储能材料，而且还可以通过减小纤维直径，平衡多孔结构和导电性来降低所获得的CLCF的接触电阻并增强其离子扩散动力学。具有中等预氧化程度CLCF电极表现出显着的速率性能（160 F G ^-1在100克^-1，在1其初始容量的85.6％的G ^-1）在6 M KOH水性电解质中，与没有和有过量交联结构的碳纳米纤维相比。此外，作为用于沉积NiMoO ₄的支架，可以实现令人印象深刻的电化学性能。基于CLCF和NiMoO ₄锚固CLCF的组装式非对称器件可提供1.6 V的稳定工作电压，并具有14.9 Wh kg ^–1的高能量输出和14.3 kW kg ^–1的最大功率密度。令人着迷的电化学性能可以归因于交联的纤维结构，该结构使CLCF具有快速的离子扩散动力学和快速的电子转移以及强大的结构稳定性，可以承受NiMoO ₄的体积波动在重复的充电/放电过程中。因此，我们的工作提供了一种新的策略，即通过使用沥青将具有交联结构的高性能碳纳米纤维垫设计为超级电容器设备的双功能材料。

更新日期：2020-11-19

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