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<p>Recent advancements in membrane-based osmotic energy harvesting have focused on nanofluidic membranes that provide high selectivity and rapid ion transport. This study presents a novel nanofluidic membrane configuration involving in-situ synthesis of 2,2,6,6-tetramethylpiperidin-1-yloxyl (TEMPO) oxidized cellulose nanofibers (TOCNs) in conjunction with a zirconium-based metal–organic framework (UiO-66). The integration of negatively charged TOCNs into hierarchically porous UiO-66 resulted in membrane that exhibits superior ion selectivity (0.948) and high energy conversion efficiency (40.15%). The osmotic energy generator, employing the TOCN/UiO-66 composite membrane, delivers a maximum output power density of 2.0 Wm<sup>−2</sup> under a 50-fold KCl concentration gradient. This configuration illustrates the potential of combining metal–organic frameworks with TOCN-based nanofluidic membranes to develop highly efficient osmotic energy conversion systems.</p>

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In situ synthesized TOCNs/UiO-66 composite nanofluidic membrane for superior ion selectivity and high efficiency osmotic energy conversion

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • Jiajian Zhang,
  • Mengyu Miao,
  • Mehraj Ahmad,
  • Zhouyue Li,
  • Zhe Sun,
  • Wenkai Fu,
  • Sha Wang

摘要

Recent advancements in membrane-based osmotic energy harvesting have focused on nanofluidic membranes that provide high selectivity and rapid ion transport. This study presents a novel nanofluidic membrane configuration involving in-situ synthesis of 2,2,6,6-tetramethylpiperidin-1-yloxyl (TEMPO) oxidized cellulose nanofibers (TOCNs) in conjunction with a zirconium-based metal–organic framework (UiO-66). The integration of negatively charged TOCNs into hierarchically porous UiO-66 resulted in membrane that exhibits superior ion selectivity (0.948) and high energy conversion efficiency (40.15%). The osmotic energy generator, employing the TOCN/UiO-66 composite membrane, delivers a maximum output power density of 2.0 Wm−2 under a 50-fold KCl concentration gradient. This configuration illustrates the potential of combining metal–organic frameworks with TOCN-based nanofluidic membranes to develop highly efficient osmotic energy conversion systems.