Highly Stable Hybrid Capacitive Deionization with a MnO2 Anode and a Positively Charged Cathode,Environmental Science & Technology Letters

当前位置： X-MOL 学术 › Environ. Sci. Technol. Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Highly Stable Hybrid Capacitive Deionization with a MnO2 Anode and a Positively Charged Cathode
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2018-01-24 00:00:00 , DOI: 10.1021/acs.estlett.7b00540
Tingting Wu ₁ , Gang Wang ₁ , Shiyong Wang ₁ , Fei Zhan ₁ , Yu Fu ₁ , Huiying Qiao ₁ , Jieshan Qiu _{1,

2}

Affiliation

Performance degradation caused by the oxidation of carbon anodes during capacitive deionization (CDI) remains a major problem that may greatly restrict the practical application of CDI. To improve the cyclic stability of CDI, carbon-based anode materials were replaced by pseudocapacitive MnO₂ in this work. The cation-selective MnO₂ anode was assembled with an anion-selective quaternized poly(4-vinylpyridine)-coated activated carbon cathode into a hybrid CDI cell. The cell exhibited inverted CDI performance with a wide operating voltage window of 1.4 V and a salt adsorption capacity (SAC) of 14.9 mg/g in 500 mg/L NaCl. The SAC retention ratio of the cell can be as high as 95.4% after 350 adsorption–desorption cycles at 1.0/0 V, while that of the CDI cell consisting of activated carbon electrodes was only 15.7% after 285 cycles. The enhanced cyclic stability of the hybrid CDI cell is attributed to the employment of the MnO₂ anode, which avoided the use and oxidation of carbon anodes.

中文翻译：

带有MnO ₂阳极和带正电的阴极的高度稳定的混合电容去离子

电容去离子（CDI）期间碳阳极氧化引起的性能下降仍然是一个主要问题，可能会严重限制CDI的实际应用。为了提高CDI的循环稳定性，在这项工作中，碳基负极材料被伪电容MnO ₂代替。阳离子选择性MnO ₂阳极与阴离子选择性季铵化聚（4-乙烯基吡啶）涂层的活性炭阴极组装在一起，成为混合CDI电池。在500 mg / L NaCl中，该电池具有1.4 V的宽工作电压范围和14.9 mg / g的盐吸附容量（SAC），具有反向CDI性能。在1.0 / 0 V下经过350次吸附-解吸循环后，电池的SAC保留率可高达95.4％，而由活性炭电极组成的CDI电池在285次循环后的SAC保留率仅为15.7％。混合CDI电池增强的循环稳定性归因于MnO ₂阳极的使用，从而避免了碳阳极的使用和氧化。

更新日期：2018-01-25

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11