An electrochemically reduced ultra-high mass loading three-dimensional carbon nanofiber network: a high energy density symmetric supercapacitor with a reproducible and stable cell voltage of 2.0 V,Nanoscale

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An electrochemically reduced ultra-high mass loading three-dimensional carbon nanofiber network: a high energy density symmetric supercapacitor with a reproducible and stable cell voltage of 2.0 V
Nanoscale ( IF 5.8 ) Pub Date : 2021-10-29 , DOI: 10.1039/d1nr05943b
Gunendra Prasad Ojha _{1,

2} , Bishweshwar Pant _{1,

2} , Jiwan Acharya _{1,

2} , Mira Park _{1,

2}

Affiliation

Commercial supercapacitors need a high mass loading of more than 10 mg cm⁻² and a high working potential window to resolve the low energy density concern. Herein, we have demonstrated a thick, ultrahigh mass loading (35 mg cm⁻²) and wide cell voltage electrochemically reduced layer-by-layer three-dimensional carbon nanofiber network (LBL 3D-CNF) electrode via electrospinning, sodium borohydride treatment, carbonization, and electro-reduction techniques. During the electro-reduction technique, Na⁺ is adsorbed onto the various defect sites of LBL 3D-CNFs, which properly inhibits the formation of the intermediate HER (hydrogen evolution reaction) product, leading to a wide cell voltage, whereas the LBL 3D-CNF network evokes an opportunity for storing a greater number of charges, resulting in excellent electrochemical performances. A symmetric supercapacitor with a reproducible and stable cell voltage of 2.0 V is constructed and demonstrated. The as-constructed device can deliver an areal energy output of 1922 μW h cm⁻² at a power density of 3979 W kg⁻¹ equal to a gravimetric energy density of 27 W h kg⁻¹, and an outstanding cyclic durability of 97.4% after 20 000 GCD cycles. These record-breaking performances would make our device one of the most promising candidates from an industrial point of view.

中文翻译：

电化学还原的超高质量负载三维碳纳米纤维网络：高能量密度对称超级电容器，具有可重现且稳定的电池电压为 2.0 V

商业超级电容器需要超过 10 mg cm ^{-2 的}高质量负载和高工作电位窗口来解决低能量密度问题。在此，我们通过静电纺丝、硼氢化钠处理、碳化展示了一种厚的、超高质量负载（35 mg cm ^-2）和宽电池电压的电化学降低的逐层三维碳纳米纤维网络（LBL 3D-CNF）电极, 和电还原技术。在电还原技术中，Na ⁺被吸附到 LBL 3D-CNFs 的各种缺陷位点上，这适当地抑制了中间 HER（析氢反应）产物的形成，导致了宽的电池电压，而 LBL 3D-CNF 网络唤起了存储更大的机会电荷数，从而产生优异的电化学性能。构建并演示了具有 2.0 V 的可重现且稳定的电池电压的对称超级电容器。所构建的装置可以在 3979 W kg ^-1的功率密度下提供 1922 μW h cm ^-2的面积能量输出，相当于 27 W h kg ^-1的重量能量密度，并且在 20 000 次 GCD 循环后具有 97.4% 的出色循环耐久性。从工业的角度来看，这些破纪录的性能将使我们的设备成为最有前途的候选设备之一。

更新日期：2021-11-22

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