Robust sulfonated poly (ether ether ketone) nanochannels for high-performance osmotic energy conversion

• 作者: Jin Wang Jinhui Pang Lei Jiang Linsen Yang Liping Wen Teng Zhou Weiwen Xin Xiang-Yu Kong Yongchao Qian Yuanyuan Zhao
• 来源期刊: 国家科学评论（英文版）
• 关键词: SPEEK membrane nanochannel ion-selectivity salinity gradient power generation
• 年，卷（期）: 2020,（8）
• 页码范围: 1349-1359
• 页数: 11页
• 语种: 英文
• DOI: 10.1093/nsr/nwaa057

摘要

The membrane-based reverse electrodialysis (RED) technique has a fundamental role in harvesting clean and sustainable osmotic energy existing in the salinity gradient.However,the current designs of membranes cannot cope with the high output power density and robustness.Here,we construct a sulfonated poly (ether ether ketone) (SPEEK) nanochannel membrane with numerous nanochannels for a membrane-based osmotic power generator.The parallel nanochannels with high space charges show excellent cation-selectivity,which could further be improved by adjusting the length and charge density of nanochannels.Based on numerical simulation,the system with space charge shows better conductivity and selectivity than those of a surface-charged nanochannel.The output power density of our proposed membrane-based device reaches up to 5.8 W/m2 by mixing artificial seawater and river water.Additionally,the SPEEK membranes exhibit good mechanical properties,endowing the possibility of creating a high-endurance scale-up membrane-based generator system.We believe that this work provides useful insights into material design and fluid transport for the power generator in osmotic energy conversion.