基于非对称纤维素纳米纤维异质膜的水传输促进渗透能量转换  

Water transport boosted osmotic energy conversion based on an asymmetric cellulose nanofiber heterogenous membrane

作　　者：侯淑华 赵佳利 张哲华 胡宇浩 付林 钱永超 陈伟鹏 周圣阳 孔祥玉 闻利平 Shuhua Hou;Jiali Zhao;Zhehua Zhang;Yuhao Hu;Lin Fu;Yongchao Qian;Weipeng Chen;Shengyang Zhou;Xiangyu Kong;Liping Wen(College of Chemistry and Materials Engineering,Bohai University,Jinzhou 121013,China;CAS Key Laboratory of Bio-inspired Materials and Interfacial Science,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;School of Future Technology,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]College of Chemistry and Materials Engineering,Bohai University,Jinzhou 121013,China [2]CAS Key Laboratory of Bio-inspired Materials and Interfacial Science,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China [3]School of Future Technology,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Science China Materials》2024年第8期2567-2574,共8页中国科学（材料科学）（英文版）

基　　金：supported by the National Natural Science Foundation of China(22005038,21988102);the Natural Science Foundation of Liaoning Province(2021-MS-314,2020-MS-289);the Key Research Program of the Chinese Academy of Sciences(QYZDY-SSWSLH014)。

摘　　要：海洋渗透能是最有前景的可持续能源之一.非对称纳米通道膜由于其优越的离子选择性在海洋渗透能转化中受到广泛关注,但较低的离子通量仍然是其需要突破的瓶颈.本文采用纤维素纳米纤维和磺化聚砜(SPSf40)制备了非对称异质膜,这种非对称异质膜有效地提高了离子电导率,通过混合人工河流和海水的输出功率密度可达8.3 W/m^(2).与传统的离子交换膜相比,非对称异质膜的离子电导率和最大功率密度分别提高了325.0%和48.2%.从海水(非对称异质膜的疏水侧)到河水(非对称异质膜的亲水侧)的输运抑制了水的渗透压,有助于高离子的传输通量,提高了海洋渗透能量转换效率.高离子选择性的浸润梯度膜为渗透转化膜的开发提供了一种新方法.Osmotic energy is a promising sustainable energy candidate.Asymmetric nanochannel membranes have attracted considerable attention owing to their superior ion selectivity.However,the low ionic conductivity of membranes is a bottleneck for osmotic energy harvesting.Herein,we demonstrate an asymmetric heterogenous membrane with a wettability gradient fabricated by cellulose nanofiber and sulfonated polysulfone(SPSf40).The membrane effectively enhances the ionic conductivity.The output power density reaches 8.3 W/m^(2)by mixing artificial river and seawater.Compared to traditional ion-exchange membranes(SPSf40),the asymmetric heterogenous membrane shows increased conductivity and output power density by 325.0%and 48.2%,respectively.Water transport from seawater(hydrophobic side of asymmetric heterogenous membrane)to river water(hydrophilic side of asymmetric heterogenous membrane),inhibits osmotic pressure,contributes to the high ion conductivity,and enhances energy conversion.The wettability gradient membranes with high ion selectivity provide a way to develop a new generation of membranes for osmotic conversion.

关 键 词：离子选择性 能量转换效率 离子电导率 可持续能源 离子交换膜 纤维素纳米纤维 水传输 磺化聚砜 

分 类 号：P743[天文地球—海洋科学] TQ051.893[化学工程]