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Homogeneous Polymer Membrane for Ultra-Stable Osmotic Energy Conversion and Circular Material Lifecycle.

Wanlu Zhang1, Jianwei He1, Xiaoli Liu1

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Small (Weinheim an Der Bergstrasse, Germany)
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Summary
This summary is machine-generated.

Hydrolyzed polyacrylonitrile (HPAN) membranes offer a sustainable solution for osmotic energy generation, achieving high power density and exceptional cation selectivity. These membranes also demonstrate remarkable recyclability, paving the way for next-generation energy technologies.

Keywords:
closed‐loop recoveryhydrolyzed polyacrylonitrileosmotic energysustainable membranes

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sustainable Energy

Background:

  • Membrane-based osmotic energy generation utilizes salinity gradients for sustainable power.
  • Long-term operational stability and end-of-life recyclability of membranes are critical challenges.
  • Hydrolyzed polyacrylonitrile (HPAN) membranes offer tunable properties and inherent recyclability.

Purpose of the Study:

  • To develop and evaluate HPAN membranes for high-performance and recyclable osmotic energy generation.
  • To investigate the relationship between membrane structure and ion selectivity.
  • To assess the long-term stability and recyclability of HPAN membranes in energy harvesting applications.

Main Methods:

  • Fabrication of HPAN membranes with controlled hydrolysis.
  • Characterization of membrane structure, including hydrogen bonding and charge density.
  • Performance testing for cation selectivity and power density under various conditions.
  • Evaluation of membrane recyclability through multiple closed-loop cycles.

Main Results:

  • HPAN membranes exhibit exceptional cation selectivity (>0.90) due to their hydrogen bonding network and high negative charge density.
  • A record-high power density of 112.4 W m⁻² was achieved under synergistic conditions (high-salt, alkaline, thermal).
  • Membranes maintained stable power density over four recovery cycles within 120 days, demonstrating unprecedented recyclability.

Conclusions:

  • HPAN membranes present a highly promising platform for sustainable osmotic energy generation.
  • The combination of high performance and recyclability addresses key limitations in current membrane technologies.
  • This work establishes a transformative paradigm for developing next-generation, eco-friendly energy harvesting solutions.