article · Catalysts
Vanadium redox flow batteries offer notable potential for large-scale energy storage on power grids. To enhance battery performance, catalysts derived from metal-organic frameworks were produced through carbonisation at varying sintering temperatures. Among the tested materials, a zirconium-based catalyst annealed at 900 degrees Celsius demonstrated the highest electrochemical activity for the target vanadium redox reactions. When applied to graphite felt electrodes, this modified material achieved a 3.9 percent increase in energy efficiency compared to unmodified felt at a current density of 100 milliamperes per square centimetre. Discharge capacity also rose substantially, showing a 31 percent improvement at 80 milliamperes per square centimetre and a 107 percent rise at 100 milliamperes per square centimetre. The improved performance stems from active oxygen-containing sites, high surface area, and conductive graphitic carbon containing zirconium oxide. Additionally, the modified electrode maintained stable energy efficiency without degradation over 100 operational cycles.
Grid-scale renewable energy systems depend on effective, durable storage technologies to manage fluctuating power supply. Improving the efficiency and capacity of vanadium redox flow batteries through advanced carbon-based catalysts addresses a key operational limitation of standard graphite felt electrodes. This allows batteries to hold more charge, operate more efficiently, and maintain reliable performance over repeated cycles without rapid degradation.
This development could enable higher-performing electrode components for vanadium redox flow battery manufacturers and grid-scale storage developers. The catalyst delivers improved capacity and energy efficiency while displaying stability over 100 cycles. Because the results are based on laboratory cell testing under specific cycling conditions, the technology appears to be applied and tested at an early stage, requiring further scale-up and longer-term operational validation before real-world deployment.
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Vanadium redox flow battery (VRFB) is one of the most promising technologies for grid-scale energy storage applications because of its numerous attractive features. In this study, metal-organic frameworks (MOF)-derived catalysts (MDC) are fabricated using carbonization techniques at different sintering temperatures. Zirconium-based MOF-derived catalyst annealed at 900 °C exhibits the best electrochemical activity toward VO2+/VO2+ redox couple among all samples. Furthermore, the charge-discharge test confirms that the energy efficiency (EE) of the VRFB assembled with MOF-derived catalyst modified graphite felt (MDC-GF-900) is 3.9% more efficient than the VRFB using the pristine graphite felt at 100 mA cm−2. Moreover, MDC-GF-900 reveals 31% and 107% higher capacity than the pristine GF at 80 and 100 mA cm−2, respectively. The excellent performance of MDC-GF-900 results from the existence of oxygen-containing groups active sites, graphite structure with high conductivity embedded with zirconium oxide, and high specific surface area, which are critical points for promoting the vanadium redox reactions. Because of these advantages, MDC-GF-900 also possesses superior stability performance, which shows no decline of EE even after 100 cycles at 100 mA cm−2.
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DOI: 10.3390/catal11101188
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