| 초록 |
Vanadium redox flow battery has been emerged as one of the most promising technologies, because it employees the same element such as vanadium in both half-cells, which prevents the issue related to crossover between the two half-cell electrolytes. However, the cell polarization during the redox reactions in electrodes is one of the problems to be overcome for the stable cell performance. In this study, we fabricated free-standing graphitic nanoweb electrode (GNE) with a high specific surface area of 213 m2 g-1 and highly graphitic structure for acid stability as well as a high energy efficiency. The electrocatalytic properties of GNE exhibited superior catalytic effects such as low anodic and cathodic peak potential separation values of ~73.4 mV (catholyte) in a cyclic voltammetry conducted at a sweep rate of 2 mV s-1. In addition, feasibility of GNE was demonstrated by full cell with negative and positive electrode, which indicated considerably improved energy efficiency of 85.8%. |
