Journal of Mineral and Material Science
[ ISSN : 2833-3616 ]
ZIF-67 Derived Porous Carbon Microstructures Modified Electrodes for High-performance Vanadium Redox Flow Batteries
1Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education,Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry and Technology, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi’an 710021, P. R.China
2Xi’an Lanqiao New Energy Technology Co., LTD, Xi’an 710018, P. R. China
3Shaanxi Engineering Research Center of Controllable Neutron Source, College of Electronics and Information Engineering, Xijing University, Xi’an, 710123, People’s Republic of China
Corresponding Authors
Keywords
Abstract
Graphite felts (GF) has been used as electrode material for VRFBs, yet surface modification is necessary to improve electrochemical activity and hydrophilia. Herein, a porous carbon modified electrode ZIF-67-GF@450-A was prepared by a ZIF-67 combination, calcination at 450 oC and subsequent acid etching. It was shown that the uniformly distributed carbon microstructures introduced to the microfilaments of graphite felt enhanced the electrodes performance, and promoted VO2+/VO2 + redox reaction. As a result, the all-vanadium redox flow battery (VRFB) assembled with ZIF-67-GF@450-A as the electrode could maintain energy efficiency (EE) of 82.09% and 71.33% at current densities of 200 mA cm-2 and 400 mA cm-2, respectively, with a discharge capacity of 477.5 mAh at 400 mA cm-2. This electrode modification method provides valuable insights for the further improvement of high-performance VRFB