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

National Science Review 2020年第8期7卷 1349-1359页

作者： Yuanyuan Zhao Jin Wang Xiang-Yu Kong Weiwen Xin Teng Zhou Yongchao Qian Linsen Yang Jinhui Pang Lei Jiang Liping Wen CAS Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences Key Laboratory of Super Engineering Plastic of Ministry of Education Jilin University School of Future Technology University of Chinese Academy of Sciences Mechanical and Electrical Engineering College Hainan University School of Science Northwestern Polytechnical University

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/m2by 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.

关键词： SPEEK membrane nanochannel ion-selectivity salinity gradient power generation

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