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Ke Shi, Hongyi Wan, Keyu Wanga, Fumohan Fang, Shiyi Li, Yixing Wang, Linfeng Lei, Linzhou Zhuang, Zhi Xu. Self-sustaining Alkaline Seawater Electrolysis via Forward Osmosis Membranes. Green Energy&Environment. doi: 10.1016/j.gee.2024.04.003
Citation: Ke Shi, Hongyi Wan, Keyu Wanga, Fumohan Fang, Shiyi Li, Yixing Wang, Linfeng Lei, Linzhou Zhuang, Zhi Xu. Self-sustaining Alkaline Seawater Electrolysis via Forward Osmosis Membranes. Green Energy&Environment. doi: 10.1016/j.gee.2024.04.003
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Self-sustaining Alkaline Seawater Electrolysis via Forward Osmosis Membranes

doi: 10.1016/j.gee.2024.04.003

  • a State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China;

  • b Suzhou Laboratory, Suzhou, 215000, China;

  • c Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, Hunan, Yueyang 414000, China

Funds:

The authors gratefully acknowledge the research funding provided by the National Key R&D Program of China (Grant No.2021YFB3801301),National Natural Science Foundation of China(Grant Nos.22075076,22208097and 22378119),and Shanghai Pilot Program for Basic Research(22TQ1400100-4).

  • Received date 17 February 2024, Accepted date 09 April 2024, RevRecd date 01 April 2024, Available online 20 April 2024
    Abstract
  • Seawater electrolysis for hydrogen production faces inherent challenges, including side reactions, corrosion, and scaling, stemming from the intricate composition of seawater. In response, researchers have turned to continuous water splitting using forward osmosis (FO)-driven seawater desalination. However, the necessity of a neutral electrolyte hampers this strategy due to the limited current density and scarcity of precious metals. Herein, this study applies alkali-durable FO membranes to enable self- sustaining seawater splitting, which can selective withdraw water molecules, from seawater, via concentration gradient. The membranes demonstrated outstanding perm-selectivity of water/ions (~5830 mol mol-1) during month-long alkaline resistance tests, preventing electrolyte leaching (>97% OH- retention) while maintaining~95% water balance (VFO=Velectrolysis) via preserved concentration gradient for consistent forward-osmosis influx of water molecules. With the consistent electrolyte environment protected by the polyamide FO membranes, the NiFe-Ar-P catalyst exhibits promising performance:a sustain current density of 360 mA cm-2 maintained at the cell voltage of 2.10 V and 2.15 V for 360 h in the offshore seawater, preventing Cl/Br corrosion (98% rejection) and Mg/Ca passivation (99.6% rejection). This research marks a significant advancement towards efficient and durable seawater-based hydrogen production.

     

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