School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST) , 689-798, Ulsan, South Korea.
Nano Lett. 2013 Oct 9;13(10):4833-9. doi: 10.1021/nl402566s. Epub 2013 Sep 16.
Carbon nanofiber/nanotube (CNF/CNT) composite catalysts grown on carbon felt (CF), prepared from a simple way involving the thermal decomposition of acetylene gas over Ni catalysts, are studied as electrode materials in a vanadium redox flow battery. The electrode with the composite catalyst prepared at 700 °C (denoted as CNF/CNT-700) demonstrates the best electrocatalytic properties toward the V(2+)/V(3+) and VO(2+)/VO2(+) redox couples among the samples prepared at 500, 600, 700, and 800 °C. Moreover, this composite electrode in the full cell exhibits substantially improved discharge capacity and energy efficiency by ~64% and by ~25% at 40 mA·cm(-2) and 100 mA·cm(-2), respectively, compared to untreated CF electrode. This outstanding performance is due to the enhanced surface defect sites of exposed edge plane in CNF and a fast electron transfer rate of in-plane side wall of the CNT.
在碳毡（CF）上生长的碳纤维/纳米管（CNF/CNT）复合催化剂，是通过在 Ni 催化剂上热解乙炔气体的简单方法制备的，被研究作为钒氧化还原液流电池中的电极材料。在 500、600、700 和 800°C 下制备的样品中，在 700°C 下制备的复合催化剂（表示为 CNF/CNT-700）对 V(2+)/V(3+)和 VO(2+)/VO2(+)氧化还原对表现出最佳的电催化性能。此外，与未经处理的 CF 电极相比，在全电池中，这种复合电极在 40 mA·cm(-2)和 100 mA·cm(-2)时的放电容量和能量效率分别提高了约 64%和 25%。这种优异的性能归因于暴露的边缘平面的 CNF 表面缺陷位和 CNT 平面侧壁的快速电子转移速率的增强。
