Zinc Spinel Ferrite Nanoparticles as a Pseudocapacitive Electrode with Ultrahigh Desalination Capacity and Long-Term Stability,Environmental Science & Technology Letters

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Zinc Spinel Ferrite Nanoparticles as a Pseudocapacitive Electrode with Ultrahigh Desalination Capacity and Long-Term Stability
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2020-01-30 , DOI: 10.1021/acs.estlett.0c00027
Jie Ma _{1,

2,

3} , Yuecheng Xiong ₁ , Xiaohu Dai _{1,

3} , Fei Yu ₄

Affiliation

The hybrid capacitive deionization (HCDI) configuration is a significant branch of CDI for desalinating brackish water to address the worldwide freshwater shortage. Apart from traditional carbon-based electrodes, new inexpensive electrode materials with a high desalination capacity are pivotal in the large-scale application of capacitive deionization technology. In this study, a novel zinc spinel ferrite (ZFO) nanoparticle electrode was fabricated and applied for the first time in CDI. The electrode achieved ultrahigh desalination capacity and long-term stability without any modifications, such as carbon coating. The desalination capacity reached 136.6 mg of NaCl/g of ZFO under optimized conditions with a current density of 30 mA/g, a voltage range of −1.4 to 1.4 V, and an initial concentration of 100 mM. Moreover, the CDI system is stable for 200 cycles over a duration of more than 10 days. The excellent long-cycle performance reveals that ZFO is a competitive material for CDI in the future. The consumption of the bench-scale CDI system is also estimated ($0.33/g of NaCl), which is obviously decreased as a result of the simple synthesis and high capacity. Therefore, zinc spinel ferrite electrodes are appealing for actual desalination applications, which highlights pseudocapacitive materials for future CDI application.

中文翻译：

具有超高脱盐能力和长期稳定性的伪电容电极锌尖晶石铁氧体纳米颗粒

混合电容去离子（HCDI）配置是CDI的重要分支，用于淡化微咸水，以解决全球淡水短缺的问题。除了传统的碳基电极以外，具有高脱盐能力的新型廉价电极材料在电容性去离子技术的大规模应用中也至关重要。在这项研究中，新型的锌尖晶石铁氧体（ZFO）纳米粒子电极被制造并首次在CDI中应用。该电极实现了超高的脱盐能力和长期稳定性，无需进行任何改动（例如碳涂层）。在优化的条件下，电流密度为30 mA / g，电压范围为-1.4至1.4 V，初始浓度为100 mM时，脱盐能力达到136.6 mg NaCl / g ZFO。此外，CDI系统在超过10天的时间内可稳定200个周期。出色的长期性能表明ZFO是未来CDI的竞争材料。还估计了台式CDI系统的消耗量（$ 0.33 / g NaCl），这是由于简单的合成和高容量而明显减少的。因此，尖晶石型铁氧体锌电极在实际的脱盐应用中很有吸引力，这突出了伪电容材料在未来CDI应用中的作用。

更新日期：2020-01-31

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