吉林大学姜振华团队报道了空间电荷改进聚芳醚砜复合膜的渗透能转换。相关研究成果发表在2025年1月16日出版的《中国化学》。

离子选择性多孔膜是渗透能转换的关键部件，优化其渗透性和选择性对于提高输出性能至关重要。

该文中，为了构建渗透性和选择性协同增强的渗透能发生器，研究人员通过将磺化水凝胶插入具有可调表面电荷的3D离子通道中，制备了表面和空间电荷协同增强的3D复合膜。通过增加膜表面的电荷密度和膜的空间电荷密度，膜的选择性从0.66提高到0.94。

实验和模拟结果表明，空间电荷和表面电荷的协同增强显著改善了离子与离子通道之间的静电相互作用，从而提高了选择性、净离子通量和输出性能。在50倍的浓度梯度下，空间电荷改进的复合膜呈现出约6.4 W·m^-2的先进功率密度，几乎是没有水凝胶的相转化膜的2倍。

该研究为构建高性能渗透能发生器提供了一种有前景的解决方案。

附：英文原文

Title: Space Charge Improved Poly(Aryl Ether Sulfone) Composite Membrane for Osmotic Energy Conversion

Author: Jundong Zhong, Hongyan Qi, Tingting Xu, Weibo Sun, Zhe Zhao, Haibo Zhang, Xuanbo Zhu, Zhenhua Jiang

Issue&Volume: 2025-01-16

Abstract: The ion-selective porous membrane is the key component in osmotic energy conversion, and optimizing its permeability and selectivity is crucial for improving output performance. Here, to construct a permeability and selectivity synergistically enhanced osmotic energy generator, the surface and space charge synergistically enhanced 3D composite membrane is prepared by inserting sulfonated hydrogels into the 3D ion channels with tunable surface charge. The membrane's selectivity is improved from 0.66 to 0.94 by increasing the charge density on the membrane surface and the spatial charge density of the membrane. The experimental and simulation results showed that the synergistic enhancement of the spatial and surface charges significantly improved the electrostatic interactions between the ions and the ion channels, which led to the enhancement of selectivity, net ionic fluxes, and output performance. The space charge improved composite membrane presents an advanced power density of about 6.4 W·m–2 under a 50-fold concentration gradient, which is nearly 2 times that of the phase inversion membrane without hydrogels. Our study provides a promising solution for constructing high-performance osmotic energy generators.

DOI: 10.1002/cjoc.202401024

Source: https://onlinelibrary.wiley.com/doi/full/10.1002/cjoc.202401024