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Catalytic production of impurity-free V3.5+ electrolyte for vanadium redox flow batteries
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Catalytic production of impurity-free V3.5+ electrolyte for vanadium redox flow batteries
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Journal Article
Catalytic production of impurity-free V3.5+ electrolyte for vanadium redox flow batteries
2019
Overview
The vanadium redox flow battery is considered one of the most promising candidates for use in large-scale energy storage systems. However, its commercialization has been hindered due to the high manufacturing cost of the vanadium electrolyte, which is currently prepared using a costly electrolysis method with limited productivity. In this work, we present a simpler method for chemical production of impurity-free V
3.5+
electrolyte by utilizing formic acid as a reducing agent and Pt/C as a catalyst. With the catalytic reduction of V
4+
electrolyte, a high quality V
3.5+
electrolyte was successfully produced and excellent cell performance was achieved. Based on the result, a prototype catalytic reactor employing Pt/C-decorated carbon felt was designed, and high-speed, continuous production of V
3.5+
electrolyte in this manner was demonstrated with the reactor. This invention offers a simple but practical strategy to reduce the production cost of V
3.5+
electrolyte while retaining quality that is adequate for high-performance operations.
The vanadium redox flow battery is promising for commercial applications, but is hampered by high-cost electrolytes that are typically prepared via electrolysis. Here the authors demonstrate cost-effective chemical production of a high-quality vanadium electrolyte using platinum nanoparticles as a catalyst.
