Low-Friction Graphene Oxide-Based Ion Selective Membrane for High-Efficiency Osmotic Energy Harvesting |
| |
Authors: | Dejuan Wang Zequn Wang Jialin Chen Hui Zhi Yongxu Liu Jiebin Tang Ningbo Li Yafang Zhang Meng An Hong Liu Guobin Xue |
| |
Institution: | 1. Institute for Advanced Interdisciplinary Research (iAIR), School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022 P. R. China;2. College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 P. R. China;3. School of Physics and Technology, University of Jinan, Jinan, 250022 P. R. China |
| |
Abstract: | 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. |
| |
Keywords: | frictional effect ion selective membrane ion selectivity osmotic energy harvesting transmembrane ion transport |
|
|