Nitrogen-Doping Through Two-Step Pyrolysis of Polyacrylonitrile on Graphite Felts for Vanadium Redox Flow Batteries,Energy & Fuels

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Nitrogen-Doping Through Two-Step Pyrolysis of Polyacrylonitrile on Graphite Felts for Vanadium Redox Flow Batteries
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-03-24 , DOI: 10.1021/acs.energyfuels.0c00689
Sang Jun Yoon _{1,

2} , Sangwon Kim ₃ , Dong Kyu Kim ₄ , Duk Man Yu ₁ , Rolf Hempelmann ₂ , Young Taik Hong ₁ , Soonyong So ₁

Affiliation

We report a facile method for the nitrogen-doping process using the same precursor material for graphite felt electrodes, polyacrylonitrile (PAN). To utilize the nitrogen content in PAN, two steps of thermal treatment of PAN-coated graphite felts are performed; a PAN solution is coated on a graphite felt, and the sample is oxidized at 280 °C under the ambient atmosphere and carbonized at 900 °C under N₂, consecutively. Through the two-step pyrolysis, nitrogen is successfully doped on the graphite felts, and the concentration of PAN solution is controlled to enhance the performance of vanadium redox flow batteries (VRFBs). With 4 wt % of PAN coating solution, the electrode electrocatalytic activity is enhanced compared to that of a conventional electrode, and the voltage efficiency increases, resulting in higher energy efficiency under the various current densities. Especially at high current densities above 100 mA/cm², the optimized nitrogen-doped electrode shows about 5% higher voltage and energy efficiencies and a higher long-term stability in terms of efficiencies and capacity retention. This nitrogen-doping process with the same precursor for the electrode offers potential for employing nitrogen-doping on the conventional electrode materials in an inexpensive way.

中文翻译：

钒毡液流电池石墨毡上聚丙烯腈两步热解过程中的氮掺杂

我们报告了一种用于氮掺杂工艺的简便方法，该方法使用的石墨毡电极使用相同的前体材料聚丙烯腈（PAN）。为了利用PAN中的氮含量，进行了两个PAN涂覆的石墨毡的热处理步骤；第二步是对PAN涂覆的石墨毡进行热处理。将PAN溶液涂在石墨毡上，样品在280°C的环境气氛下氧化，并在900°C的N ₂下碳化，连续。通过两步热解，成功地将氮掺杂到了石墨毡上，并且控制了PAN溶液的浓度以增强钒氧化还原液流电池（VRFB）的性能。与常规电极相比，使用4 wt％的PAN涂层溶液，电极的电催化活性得到增强，并且电压效率提高，从而在各种电流密度下均具有更高的能量效率。特别是在高于100 mA / cm ^2的高电流密度下，经过优化的氮掺杂电极在效率和容量保持方面显示出约5％的更高的电压和能量效率以及更高的长期稳定性。用相同的电极前体进行氮掺杂的方法提供了以廉价的方式在常规电极材料上采用氮掺杂的潜力。

更新日期：2020-04-23

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