Low-Friction Graphene Oxide-Based Ion Selective Membrane for High-Efficiency Osmotic Energy Harvesting,Advanced Energy Materials

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Low-Friction Graphene Oxide-Based Ion Selective Membrane for High-Efficiency Osmotic Energy Harvesting
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-11-27 , DOI: 10.1002/aenm.202302262
Dejuan Wang ₁ , Zequn Wang ₂ , Jialin Chen ₁ , Hui Zhi ₁ , Yongxu Liu ₁ , Jiebin Tang ₁ , Ningbo Li ₁ , Yafang Zhang ₃ , Meng An ₂ , Hong Liu _{1,

4} , Guobin Xue ₁

Affiliation

Graphene-based laminate membranes with selective ion-transport capability show great potential in renewable osmotic energy harvesting. One of the great challenges is to reduce the overall energy barriers while remain the high ion selectivity in the transmembrane ion transport process. Here, a strategy is proposed to break the trade-off between ion selectivity and permeability in laminar nanochannels using amphiphilic molecules as modifier, which enhances the surface charge density of nanochannel by loading more ion polymer with polar head and lows the frictional force of ion transport with hydrophobic tail. The conversion efficiency can reach to 32% in osmotic energy harvesting (0.5 m/0.01 m concentration gradient) after adopting this modifier. During the process of mixing real river water and seawater, the maximum power density can reach to 13.38 W m⁻². The amphiphilic molecules also bind adjacent nanosheets, endowing the membrane's strong mechanical strength and high stability in aqueous solution. This work can open up a new way to regulate the transmembrane ion transport in 2D laminate membranes.

中文翻译：

用于高效渗透能收集的低摩擦氧化石墨烯基离子选择性膜

具有选择性离子传输能力的石墨烯层压膜在可再生渗透能收集方面显示出巨大潜力。巨大的挑战之一是降低总体能垒，同时保持跨膜离子传输过程中的高离子选择性。在此，提出了一种策略，以两亲性分子作为改性剂打破层状纳米通道中离子选择性和渗透性之间的权衡，通过负载更多带有极性头的离子聚合物来提高纳米通道的表面电荷密度，并降低离子传输的摩擦力具有疏水性尾部。采用该改性剂后，渗透能收集（0.5 m /0.01 m浓度梯度）转换效率可达32% 。在真实河水和海水混合过程中，最大功率密度可达13.38 W m ^-2。两亲性分子还结合相邻的纳米片，赋予膜强大的机械强度和在水溶液中的高稳定性。这项工作可以开辟一种调节二维层压膜中跨膜离子传输的新方法。

更新日期：2023-11-27

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