School of Chemical Engineering, North China University of Science and Technology, Tangshan 063009, China.
Ministry of Education Key Laboratory of Testing Technology for Manufacturing Process, Southwest University of Science and Technology, Mianyang 621010, China.
J Colloid Interface Sci. 2020 Apr 15;566:434-443. doi: 10.1016/j.jcis.2020.01.118. Epub 2020 Jan 30.
Porous nano biomass carbon was synthesized by one-step method using scaphium scaphigerum as carbon source and was employed as negative catalyst for vanadium redox flow battery. Potassium ferrate was used to realize synchronous etching, introducing oxygen-containing groups and graphitization of scaphium scaphigerum to obtain porous, oxygen-rich, high-graphization carbon materials (SS-K/Fe). Compared with traditional two-step method, one-step method has advantages of low-time requirement, high efficiency and no pollution. The prepared SS-K/Fe sample has abundant microporous structure, high degree of graphitization and many oxygen-containing groups. The electrochemical test results show that the prepared carbon-based materials exhibit superior electrocatalytic capability for V/V redox reaction. The electrode process can be accelerated from three steps including ion diffusion, electrochemical reaction and electron transfer processes, which are due to the enhancement of wetting performance and electrical conductivity, and an increase of effective catalytic area. Compared with pristine cell, the SS-K/Fe modified cell can improve the energy efficiency by 6.2% at the current density of 50 mA cm. This method is expected to realize low cost, green and renewable porous carbon materials for future energy storage systems.
采用一步法合成了以苏铁为碳源的多孔纳米生物质碳，并将其用作钒氧化还原流电池的负催化剂。使用高铁酸钾实现同步刻蚀，引入含氧基团和苏铁的石墨化，得到多孔、富氧、高石墨化的碳材料（SS-K/Fe）。与传统的两步法相比，一步法具有时间要求低、效率高、无污染等优点。所制备的 SS-K/Fe 样品具有丰富的微孔结构、高石墨化程度和许多含氧基团。电化学测试结果表明，所制备的碳基材料对 V/V 氧化还原反应表现出优异的电催化性能。电极过程可以从离子扩散、电化学反应和电子转移三个步骤加速，这是由于润湿性和导电性的增强以及有效催化面积的增加。与原始电池相比，在 50 mA cm 的电流密度下，SS-K/Fe 修饰电池可以将能量效率提高 6.2%。该方法有望为未来的储能系统实现低成本、绿色和可再生的多孔碳材料。
