High entropy alloy oxide coating of VNbMoTaWOx as a novel electrode modification of vanadium redox flow batteries
高熵合金氧化物鍍層 VNbMoTaWOx 作為釩氧化還原液流電池之新型电极改質方法
📄 英文摘要
The vanadium redox flow battery (VRFB) is the leading candidate for a large-scale renewable energy storage solution. A pivotal element of the VRFB, the electrode, plays a significant role in influencing both the energy efficiency and the cost of the system. This research introduced a groundbreaking single-step technique employing high power impulse magnetron sputtering (HiPIMS) to enhance graphite felt (GF). Through this method, a thin layer of VNbMoTaW high entropy alloy oxide (HEAO) was uniformly coated on the GF surface by adjusting the oxygen gas flow, markedly boosting the VRFB electrode's reaction kinetics. The VRFB equipped with the HEAO-modified graphite electrode, specifically the HEAO50 electrode, demonstrated a superior energy efficiency of 80.50% at a current density of 100 mA cm⁻², outperforming the VRFB with the unmodified graphite electrode by 9.49%. These results are attributed to the plenty of oxygen vacancies and enhanced hydrophilicity of the GF, both of which contribute to improved electrode performance. Additionally, the amorphous structure reduces ion diffusion distances, further enhancing mass transportation and reaction kinetics within the GF electrode. This inventive method presents a viable and cost-effective strategy for electrode enhancement in VRFB, promising significant advancements in renewable energy storage technologies.
📄 中文摘要
釩氧化還原液流電池（VRFB）是大規模再生能源儲能的首選方案。作為 VRFB 的關鍵元件，電極對系統的能源效率與成本有著重大影響。本研究引入了一種創新的單步技術——利用高功率脈衝磁控濺鍍（HiPIMS）來增强石墨氈（GF）。透過此方法，僅需調整氧氣流量，即可在 GF 表面均勻鍍上一層薄薄的 VNbMoTaW 高熵合金氧化物（HEAO）鍍層，大幅提升 VRFB 電極的反應動力學。配備 HEAO50 改質石墨氈电极的 VRFB，在 100 mA cm⁻² 電流密度下達到優異的 80.50% 能量效率，較未改質石墨氈电极提升了 9.49%。此結果歸因於 GF 豐富的氧空位與增强的親水性，兩者共同贡献於改善的 electrode 性能。此外，HEAO 的非晶結構縮短了離子擴散距離，進一步增强了 GF 电极內部的質量傳輸與反應動力學。此創新方法為 VRFB 的电极增强提供了一個可行且經濟高效的策略，為再生能源儲能技術帶來重大突破。
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📊 關鍵圖表
