电容去离子
海水淡化
材料科学
阳极
尖晶石
电化学
化学工程
电极
锂(药物)
碳纤维
电池(电)
膜
化学
复合材料
冶金
医学
生物化学
功率(物理)
物理
物理化学
量子力学
复合数
工程类
内分泌学
作者
Yuxin Jiang,Kezhi Li,Sikpaam Issaka Alhassan,Yiyun Cao,Haoyu Deng,Shan Tan,Haiying Wang,Chong-Jian Tang,Liyuan Chai
标识
DOI:10.3390/ijerph20010517
摘要
Capacitive deionization (CDI) is a newly developed desalination technology with low energy consumption and environmental friendliness. The surface area restricts the desalination capacities of traditional carbon-based CDI electrodes while battery materials emerge as CDI electrodes with high performances due to the larger electrochemical capacities, but suffer limited production of materials. LiMn2O4 is a massively-produced lithium-ion battery material with a stable spinel structure and a high theoretical specific capacity of 148 mAh·g−1, revealing a promising candidate for CDI electrode. Herein, we employed spinel LiMn2O4 as the cathode and activated carbon as the anode in the CDI cell with an anion exchange membrane to limit the movement of cations, thus, the lithium ions released from LiMn2O4 would attract the chloride ions and trigger the desalination process of the other side of the membrane. An ultrahigh deionization capacity of 159.49 mg·g−1 was obtained at 1.0 V with an initial salinity of 20 mM. The desalination capacity of the CDI cell at 1.0 V with 10 mM initial NaCl concentration was 91.04 mg·g−1, higher than that of the system with only carbon electrodes with and without the ion exchange membrane (39.88 mg·g−1 and 7.84 mg·g−1, respectively). In addition, the desalination results and mechanisms were further verified with the simulation of COMSOL Multiphysics.
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