Concentration Flow Cells Based on Chloride-Ion Extraction and Insertion with Metal Chloride Electrodes for Efficient Salinity Gradient Energy Harvest

文献类型： 外文期刊

第一作者： Tan, Guangcai

作者： Tan, Guangcai;Zhu, Haihui;Lu, Sidan;Zhu, Xiuping;Li, Hongna;Fan, Jizhou;Li, Guoqiang

作者机构：

关键词： Salinity gradient energy; Chloride-ion battery; Metal chloride; Concentration flow cell

期刊名称：ACS SUSTAINABLE CHEMISTRY & ENGINEERING （ 影响因子：8.198； 五年影响因子：8.471 ）

ISSN： 2168-0485

年卷期： 2018 年 6 卷 11 期

页码：

收录情况： SCI

摘要： Salinity gradient (SG) is a natural and renewable energy source existing in estuaries, and can also be produced during various desalination and industrial processes. Here, a new method is proposed to efficiently recover SG energy based on chloride-ion (Cl-) extraction and insertion with metal chloride electrodes and the Donnan potential over a cation-exchange membrane in a concentration flow cell. Three different metal chloride electrodes (BiCl3, CoCl2, and VCl3) were investigated in the cell, and their properties after discharging in 30 g L-1 (seawater) and 1 g L-1 (river water) NaCl solutions were studied by cyclic voltammetry, electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy. The cell with BiCl3 electrodes yielded the largest power density (max. = 3.17 W m(-2)) compared to that of CoCl2 and VCl3 electrodes, which was higher than those of most previous technologies for SG energy recovery. Fast Cl- extraction and insertion processes were observed on BiCl3 electrodes due to small charge transfer resistance and Cl- diffusion resistance. BiCl3 was reduced to metal Bi as Cl- released from the electrode to river water, while metal Bi was oxidized to BiCl3 as Cl- inserted into the electrode from seawater.

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