Importance of Anode/Cathode Mass Loadings on Capacitive Deionization Performance
Importance of Anode/Cathode Mass Loadings on Capacitive Deionization Performance
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阳极/阴极质量负载对电容去离子性能的重要性
DOI：
10.1149/1945-7111/ac00f8
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发表时间：
2021-05
影响因子：
3.9
通讯作者：
Wang Yang
中科院分区：
文献类型：
--
作者：
Deng Dingfei;Chen Bo;Zhao Cong;Anderson Marc A.;Wang Yang
电容去离子是一种很有前途的电化学水处理技术。活性炭是一种常用的电吸附材料，其参数对电吸附性能有重要影响。在这项工作中，由于电极的质量负载（厚度从200 μm到600 μm不等），对称和不对称的电池被构造来研究质量负载对电化学性能和脱盐的重要性。结果表明，厚度为200 μm的电极实现了最大的比电容72.65 F g− 1，而对称电池中较厚的电极可以达到较低的比电容。然而，在不对称电池中工作电极的电化学性能可以用较厚的对电极来改善。至于对称电池中的脱盐性能，S200在1 V电池电压下实现了7.05 mg g-1的最高盐吸附容量，并且离子去除率增加，而电极利用率随着质量负载的增加而降低。在非对称电池中，当阳极固定在400 μm，阴极厚度从200 μ m增加到600 μm时，盐吸附容量、平均盐吸附速率和充电效率从6.33 mg g− 1、0.49 mg g− 1 min− 1、44.77%降低到3.27 mg g− 1、0.17 mg g− 1 min− 1、16.14%，分别下降48.34%、65.31%和63.95%。通过多种技术表征的电极表面的氧化状态表明，可以用更薄的阴极来降低阳极的氧化程度。最终，降低阴极的质量负载有利于提高总脱盐性能和循环稳定性。
Capacitive deionization is a promising electrochemical water treatment technology. Activated carbon is commonly used and its corresponding parameters have an important influence on the electrosorption performance. In this work, on account of the mass loadings of the electrodes (the thickness varies from 200 μm to 600 μm), symmetric and asymmetric cells are constructed to investigate the importance of mass loadings on electrochemical performance and desalination. The results show that the electrode with the thickness of 200 μm achieves the largest specific capacitance of 72.65 F g− 1, and thicker electrodes in the symmetric cell can reach a lower specific capacitance. However, the electrochemical performance of a working electrode in an asymmetric cell can be improved with a thicker counter electrode. As for desalination performance in the symmetric cell, S200 achieves the highest salt adsorption capacity of 7.05 mg g− 1 under 1 V cell voltage, and ion removal rate increases while electrode utilization reduces with increased mass loading. In an asymmetric cell, when the anode is fixed at 400 μm and the cathode thickness increases from 200 to 600 μm, the salt adsorption capacity, average salt adsorption rate and charge efficiency decreases from 6.33 mg g− 1, 0.49 mg g− 1 min− 1, 44.77% to 3.27 mg g− 1, 0.17 mg g− 1 min− 1, 16.14%, respectively (dropped by 48.34%, 65.31% and 63.95%, respectively). The oxidation status of the electrode surface as characterized by multiple techniques, indicates that the oxidation degree of the anode can be reduced with a thinner cathode. Ultimately, lowering the mass loading of the cathode is conducive to enhancing total desalination performance and cycling stability.
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影响因子：
10.9
作者：
He, Di;Wong, Chi Eng;Waite, T. David
通讯作者：
Waite, T. David
影响因子：
9.9
作者：
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通讯作者：
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影响因子：
6.6
作者：
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通讯作者：
S. Porada;M. Bryjak;A. J. V. Wal;P. M. Biesheuvel
影响因子：
39.8
作者：
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通讯作者：
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影响因子：
11.4
作者：
Tsouris, C.;Mayes, R.;Dai, S.
通讯作者：
Dai, S.