【摘 要】
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The membrane-based reverse electrodialysis (RED) technique has a fundamental role in harvesting clean and sustainable osmotic energy existing in the salinity gr
【机 构】
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CAS Key Laboratory of Bio-inspired Materials and Interfacial Science,Technical Institute of Physics
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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.
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