期刊
ACS APPLIED ENERGY MATERIALS
卷 5, 期 2, 页码 1984-1991出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c03507
关键词
anthraquinone redox flow battery; carbon felt; thermal pretreatment; capacity decay rate; cycling stability
资金
- Fundamental Research Funds for the Central Universities [2019QN057, PT2021-02, buctrc202009]
- Open Project of State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources [LAPS20003]
In this study, we modified a carbon felt electrode using thermal oxidation and investigated the effect of heating time on 2,6-DHAQ/K4Fe(CN)(6) RFBs. The results showed that a heating time of 2.0 hours resulted in lower capacity decay rate in 200 cycles for 2,6-DHAQ/K4Fe(CN)(6) RFBs.
Electrochemical reactions occur on the surface of the electrode, so electrode modifications are essential for redox flow batteries (RFBs). Major works regarding electrode modifications focus on traditional RFBs like vanadium systems, but minor works stress on organic RFBs that represent a rapidly developed technology for large-scale energy storage. In this work, we employ thermal oxidation (600 degrees C) and investigate the effect of the heating time on a polyacrylonitrile-based carbon felt used in 2,6-dihydroxyanthraquinone (2,6-DHAQ)/K4Fe(CN)(6) RFBs. The structure of the carbon felt is characterized by thermogravimetric analysis, scanning electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy methods. The electrochemical properties of 2,6-DHAQ are studied by cyclic voltammetry analysis. It is found that, when the heating time is set at 2.0 h, 2,6-DHAQ/K4Fe(CN)(6) RFBs exhibit a lower capacity decay rate at 0.0287% per cycle in 200 cycles, which is 3 times lower than the other cases. The results from H-1 nuclear magnetic resonance spectra unveil that the lower capacity loss is achieved by converting the byproduct anthrone back into 2,6-DHAQ at a slight cost of reducing Coulombic efficiency. Our work unambiguously demonstrates that the lifetime of anthraquinone-based RFBs can be effectively extended via thermal modification of electrodes.
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