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Boosting Iron-Chromium Redox Flow Batteries via NaCl-Induced Short-Rod High-Entropy Alloy/Graphite Felt Electrodes
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DOI：10.1021/acsaem.6c00732.png)
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Abstract
En 中文
This study aims to tackle the performance limitations of electrode materials for iron-chromium redox flow batteries (ICRFBs) through the development of a short-rod high-entropy alloy (HEA)/graphite felt (GF) composite electrode. By utilizing NaCl as both a template agent and a flux, BiInSnFeTi HEA short-rod structures (with a diameter of approximately 100 nm and an aspect ratio of 3–10) were in situ synthesized on thermally treated GF (TGF). This approach results in catalytic centers of uniform size with elemental homogeneity and ensures strong adhesion to the substrate. Electrochemical testing indicates that the optimized HEA-NaCl@TGF-1 electrode achieves an impressive energy efficiency (EE) of 74.72% under the demanding operating conditions of 60 °C and 140 mA cm−2. This performance represents a substantial 10% improvement compared to commercial TGF electrodes, along with an 82.5% reduction in charge-transfer resistance, and effectively suppresses hydrogen evolution side reactions. Single-cell cycling tests further demonstrate the reversible electrochemical performance of the electrode over 400 cycles. Notably, the cell can maintain relatively stable performance after electrolyte replacement, indicating good interfacial stability and reversibility. This method provides a simple, controllable, and scalable strategy, which paves the way for high-performance and high-stability electrodes of ICRFBs.
Keywords:
Alloys
Batteries
Electrodes
Redox reactions
Salts
iron-chromium redox flow battery
BiInSnFeTi
short-rod HEA
NaCl
graphite felt
Journal
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5.5
Papers:
1.1W
Citations:
4.5W
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Cited Papers