Advanced Materials Research Group, Centre of Hydrogen Energy, Universiti Teknologi Malaysia, 54100, Kuala Lumpur, Malaysia.
Nanoscale. 2018 Jul 13;10(27):13212-13222. doi: 10.1039/c8nr02450b.
A novel polyoxometalate-based electrode was developed by incorporating phosphotungstic acid (PWA) in nylon-6,6 nanofiber, followed by carbonization. The developed PWA-carbon nanofiber (PWA-CNF) showed the characteristics of the dual-scale porosity of micro- and mesoporous substrate with surface area of around 684 m2 g-1. The compound exhibited excellent stability in vanadium electrolyte and battery cycling. Evaluation of electrocatalytic properties toward V2+/V3+ and VO2+/VO2+ redox couples indicated promising advantages in electron transfer kinetics and increasing energy efficiency, particularly for the VO2+/VO2+ couple. Moreover, the developed electrode exhibited substantially improved energy efficiency (14% higher than that of pristine carbon felt) in the single cell vanadium redox flow battery. This outstanding performance was attributed to high surface area and abundant oxygen-containing linkages in the developed electrode.
一种新型的多金属氧酸盐基电极是通过将磷钨酸（PWA）掺入尼龙-6,6 纳米纤维中，然后碳化而开发的。所开发的 PWA-碳纳米纤维（PWA-CNF）具有微介孔基质的双尺度孔隙率特征，比表面积约为 684 m2 g-1。该化合物在钒电解质和电池循环中表现出优异的稳定性。对 V2+/V3+和 VO2+/VO2+氧化还原对的电催化性能评估表明，其在电子转移动力学和提高能量效率方面具有明显优势，特别是对于 VO2+/VO2+对。此外，在单电池钒氧化还原液流电池中，所开发的电极在能量效率方面有了显著提高（比原始碳毡高 14%）。这种出色的性能归因于开发的电极具有高比表面积和丰富的含氧键。
