Standalone macroporous graphitic nanowebs for vanadium redox flow batteries
- Standalone macroporous graphitic nanowebs for vanadium redox flow batteries
- 이성호; Min Eui Lee; Hyoung-Joon Jin; Young Soo Yun
- Macroporous carbon; Nanoweb; Nanoribbon; Electrode; Redox flow batteries
- Issue Date
- Journal of industrial and engineering chemistry
- VOL 60-90
- Vanadium redox flow batteries (VRFBs) have attracted much attention as next-generation large-scale energy storage devices. However, they suffer from a drop in the energy efficiency induced by the large activation polarization during vanadium redox reactions. In this study, we designed electrode materials with a high energy efficiency that are a macroporous monolith composed of three-dimensionally entangled graphitic nanoribbons. These materials were denoted as macroporous graphitic nanowebs (MGNWs), possessing a high specific surface area of 213 m2 g1 and a large pore volume of 0.82 cm3 g1. A large number of oxygen functional groups (C/O ratio of 4.4) were introduced after immersing the MGNWs in the acidic electrolyte used in VRFBs. These properties of M-GNWs led to beneficial electrochemical catalytic effects such as low anodic and cathodic peak potential separation (4Ep) values of 73.4 mV (catholyte) in a cyclic voltammetry test conducted at a sweep rate of 2 mV s1. Furthermore, the VRFBs based on an M-GNW anode and cathode pair exhibited a significantly improved energy efficiency of 85.8%, which is 12.4% higher than that (73.4%) of the commercial carbon felt-based VRFBs.
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