Sun Jing, Wan Yuhan, Jian Qinping, Fan Xinzhuang, Zhao Tianshou
Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, 999077, China.
Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
Small Methods. 2022 Oct;6(10):e2200626. doi: 10.1002/smtd.202200626. Epub 2022 Aug 25.
Fabricating fiber-based electrodes with a large specific surface area while maintaining high flow permeability is a challenging issue in developing high-performance redox flow batteries. Here, a sponge-like microfiber carbon electrode is reported with a specific surface area of as large as 853.6 m g while maintaining a fiber diameter in the range of 5-7 µm and a macropore size of ≈26.8 µm. The electrode is developed by electrospinning cross-linked poly(vinyl alcohol)-lignin-polytetrafluoroethylene precursors, followed by oxidation and pyrolysis. Applying the as-synthesized electrodes to a vanadium redox flow battery enables the battery to achieve an energy efficiency of 79.1% at the current density of 400 mA cm and a capacity retention rate of 99.94% over 2000 cycles, representing one of the best battery performances in the open literature. The strategy to fabricate sponge-like porous carbon microfibers holds great promise for versatile applications in redox flow batteries and other energy storage systems.
在开发高性能氧化还原液流电池时，制造具有大比表面积同时保持高流动渗透性的纤维基电极是一个具有挑战性的问题。在此，报道了一种海绵状微纤维碳电极，其比表面积高达853.6 m²/g，同时纤维直径保持在5 - 7 µm范围内，大孔尺寸约为26.8 µm。该电极通过静电纺丝交联的聚乙烯醇 - 木质素 - 聚四氟乙烯前驱体，然后进行氧化和热解来制备。将合成的电极应用于钒氧化还原液流电池，使电池在400 mA/cm²的电流密度下实现79.1%的能量效率，并在2000次循环中保持99.94%的容量保持率，这代表了公开文献中最好的电池性能之一。制造海绵状多孔碳微纤维的策略在氧化还原液流电池和其他储能系统的广泛应用中具有巨大潜力。
