High-performance silk-based hybrid membranes employed for osmotic energy conversion

Weiwen Xin, Zhen Zhang, Xiaodong Huang, Yuhao Hu, Teng Zhou, Congcong Zhu, Xiang-Yu Kong (), Lei Jiang and Liping Wen ()
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Weiwen Xin: Chinese Academy of Sciences
Zhen Zhang: Chinese Academy of Sciences
Xiaodong Huang: Chinese Academy of Sciences
Yuhao Hu: Chinese Academy of Sciences
Teng Zhou: College of Mechanical and Electrical Engineering Hainan University Haikou
Congcong Zhu: Chinese Academy of Sciences
Xiang-Yu Kong: Chinese Academy of Sciences
Lei Jiang: Chinese Academy of Sciences
Liping Wen: Chinese Academy of Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract The salinity gradient between seawater and river water is a clean energy source and an alternative solution for the increasing energy demands. A membrane-based reverse electrodialysis technique is a promising strategy to convert osmotic energy to electricity. To overcome the limits of traditional membranes with low efficiency and high resistance, nanofluidic is an emerging technique to promote osmotic energy harvesting. Here, we engineer a high-performance nanofluidic device with a hybrid membrane composed of a silk nanofibril membrane and an anodic aluminum oxide membrane. The silk nanofibril membrane, as a screening layer with condensed negative surface and nanochannels, dominates the ion transport; the anodic aluminum oxide membrane, as a supporting substrate, offers tunable channels and amphoteric groups. Thus, a nanofluidic membrane with asymmetric geometry and charge polarity is established, showing low resistance, high-performance energy conversion, and long-term stability. The system paves avenues for sustainable power generation, water purification, and desalination.

Date: 2019
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DOI: 10.1038/s41467-019-11792-8

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