Enzyme-Inspired Formulation of the Electrolyte for Stable and Efficient Vanadium Redox Flow Battery at High Temperatures
- Enzyme-Inspired Formulation of the Electrolyte for Stable and Efficient Vanadium Redox Flow Battery at High Temperatures
- 하흥용; 황진연; 살림 아바스; 김희진; 채신애; 김지원; 쉬라즈 메흐붑; 안아름; 한옥희
- electrolyte solution; enzyme; vanadium redox flow battery; stability
- Issue Date
- ACS Applied Materials & Interfaces
- VOL 11, NO 30-26853
- Histidine, inspired by vanadium bromoperoxidase enzyme, has been applied as a homogeneous electrocatalyst to the positive electrolyte of vanadium redox flow battery (VRFB) to improve the performance and stability of VRFB at elevated temperatures. The histidine-containing electrolyte is found to significantly improve the performance of VRFB in terms of thermal stability estimated by the remaining amount of VO2 + in the electrolyte (61 vs 43% of a pristine one), energy efficiency at a high current density of 150 mA cm− 2 (78.7 vs 71.2%), and capacity retention (73.2 vs 27.7%) at 60 °C. The mechanism of the catalytic functions of histidine with the chemical species in the electrolyte has been investigated for the first time by multinuclear NMR spectroscopy and first-principles calculations. The analyzed data reveal that histidine improves the kinetics of both charge and discharge reactions through different affinity toward the reactants and products as well as suppresses the precipitation of VO2 + by impeding the polymerization of vanadium ions. These findings are in good agreement with the improved chemical and electrochemical performance of the histidine-containing VRFB. Our results show a new type of chemical/electrochemical mechanism in the improved redox flow battery performance that may be essential in a new research arena for better performance of electrochemical systems.
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