Lee, Min Eui Lee, Sungho Jin, Hyoung-Joon Yun, Young Soo 2024-01-19T23:03:06Z 2024-01-19T23:03:06Z 2021-09-03 2018-04 1226-086X https://pubs.kist.re.kr/handle/201004/121551 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 (M-GNWs), possessing a high specific surface area of 213 m(2) g(-1) and a large pore volume of 0.82 cm(3) g(-1). A large number of oxygen functional groups (C/O ratio of 4.4) were introduced after immersing the M-GNWs 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 (Delta E-p) values of similar to 73.4 mV (catholyte) in a cyclic voltammetry test conducted at a sweep rate of 2 mV s(-1). 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. (C) 2017 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved. English 한국공업화학회 Standalone macroporous graphitic nanowebs for vanadium redox flow batteries Article 10.1016/j.jiec.2017.09.043 1 Journal of Industrial and Engineering Chemistry, v.60, pp.85 - 90 Journal of Industrial and Engineering Chemistry 60 85 90 N scie scopus kci ART002338431 000428103100005 2-s2.0-85030852150 Chemistry, Multidisciplinary Engineering, Chemical Chemistry Engineering Article CARBON-FELT ELECTRODE OXYGEN FUNCTIONAL-GROUPS SODIUM-ION STORAGE SIZE L-A ELECTROCHEMICAL PERFORMANCE RAMAN-SPECTROSCOPY GRAPHENE OXIDE ENERGY-STORAGE ELECTROCATALYST FABRICATION Macroporous carbon Nanoweb Nanoribbon Electrode Redox flow batteries