反向电渗析
电渗析
渗透力
功率密度
材料科学
离子
浓差极化
热电效应
塞贝克系数
极化(电化学)
电压
能量转换效率
功率(物理)
光电子学
化学物理
分析化学(期刊)
化学
膜
色谱法
电气工程
热力学
物理
工程类
反渗透
正渗透
生物化学
有机化学
物理化学
作者
Changjia Zhu,Xiuhui Zuo,Weipeng Xian,Qing Guo,Qingwei Meng,Qianqian Wang,Shengqian Ma,Qi Sun
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2022-08-11
卷期号:7 (9): 2937-2943
被引量:25
标识
DOI:10.1021/acsenergylett.2c01681
摘要
Concentration polarization (CP) is a ubiquitous phenomenon in membrane separation that is possibly responsible for the decline in overall efficiency. However, no quantitative connection between the key membrane parameters and the degree of CP has been established. In this study, the variation in permselectivity during CP was comprehensively elucidated using isostructural covalent organic framework (COF) membranes with varied charge densities. A volcano-like plot of output power density against charge population was obtained, in contrast to the conventional presumptions regarding an increase in the membrane charge density leading to an enhancement in permselectivity, and a consequent increase in osmotic voltage. The CP-induced detrimental effects were considerably mitigated by imposing a temperature gradient on the solutions, which led to an increase in the thermophoretic mobility of ions. The reverse electrodialysis (RED) device with alleviated CP yielded an output power density of up to 24.7 mW cm–2 with a temperature difference of ∼40 K; this value far exceeds the commercial benchmark, thus establishing a new criterion for RED batteries. These results outline a previously undiscovered benefit for linking thermoelectric conversion and RED to realize advanced energy-conversion technologies.
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