隧道结构 ζ-V2O5 作为混合电容去离子的氧化还原活性插入主体,ACS Applied Materials & Interfaces

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隧道结构 ζ-V2O5 作为混合电容去离子的氧化还原活性插入主体
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-12-21 , DOI: 10.1021/acsami.2c17800
Nicholas I Cool _{1,

2} , Randall James ₁ , Parker Schofield _{1,

2} , Joseph V Handy _{1,

2} , Mukul Bhatia ₃ , Sarbajit Banerjee _{1,

2}

Affiliation

地球上的大部分水含盐量过高，无法供人类食用或用于农业。提高石油采收率作业会产生大量含有高矿物质的采出水废水，这会大大加剧水资源匮乏。目前的去离子技术，如反渗透，通过从盐（少数相）中去除水（多数相）来发挥作用，因此非常耗能。此外，这些方法在从采出水废水和盐水流中选择性提取高价值离子的能力方面受到限制。混合电容去离子技术有望实现海水淡化和资源回收。在这项工作中，我们展示了利用隧道结构 ζ-V ₂ O混合电容去离子电池的构造₅作为氧化还原活性正极材料。通过法拉第插入过程增强表面吸附，与电容性高表面积碳电极相比，K 和 Li 离子的离子去除能力提高了 50%。_{提取的离子容纳在 ζ-V 2} O ₅的一维隧道框架内的表面位点和间隙位点中。离子去除的动力学取决于水合作用的自由能，它控制着电极/电解质界面处去溶剂化的难易程度。总离子去除能力还取决于固态扩散系数。ζ-V ₂ O ₅正电极显示出对 Li ^{+的显着选择性}从二叠纪盆地产出的废水中去除混流和富集锂离子浓度。

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Tunnel-Structured ζ-V2O5 as a Redox-Active Insertion Host for Hybrid Capacitive Deionization

Much of the earth’s water has a salt content that is too high for human consumption or agricultural use. Enhanced oil recovery operations generate massive volumes of produced water waste with a high mineral content that can substantially exacerbate water distress. Current deionization techniques such as reverse osmosis function by removing the water (majority phase) from the salt (minority phase) and are thus exceedingly energy-intensive. Furthermore, these methods are limited in their ability to selectively extract high-value ions from produced water waste and brine streams. Hybrid capacitive deionization holds promise for enabling both desalination and resource recovery. In this work, we demonstrate the construction of a hybrid capacitive deionization cell that makes use of tunnel-structured ζ-V₂O₅ as a redox-active positive electrode material. By augmenting surface adsorption with Faradaic insertion processes, a 50% improvement in the ion removal capacity for K and Li ions is obtained as compared to a capacitive high-surface-area carbon electrode. The extracted ions are accommodated in surface sites and interstitial sites within the one-dimensional tunnel framework of ζ-V₂O₅. The kinetics of ion removal depend on the free energy of hydration, which governs the ease of desolvation at the electrode/electrolyte interface. The overall ion removal capacity additionally depends on the solid-state diffusion coefficient. ζ-V₂O₅ positive electrodes show substantial selectivity for Li⁺ removal from mixed flow streams and enrichment of the Li-ion concentration from produced water waste derived from the Permian Basin.

更新日期：2022-12-21

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