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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
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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
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