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| Preparation and Properties of Nanocellulose/Metal Organic Framework Composite Proton Exchange Membranes |
| Received:September 06, 2025 Revised:November 16, 2025 |
| DOI：10.11980/j.issn.0254-508X.2026.02.016 |
| Key Words:cellulose nanocrystals metal organic framework in situ growth proton exchange membranes |
| Fund Project:国家自然科学基金（22378247、22078187）；陕西国际科技合作基地生物质化学与材料国际联合研究中心（2018GHJD-19）。 |
| Author Name | Affiliation | Postcode | | ZHANG Sufeng* | College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi’an, Shaanxi Province, 710021 | 710021 | | LI Nan | College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi’an, Shaanxi Province, 710021 | 710021 | | LI Jinrui | College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi’an, Shaanxi Province, 710021 | 710021 |
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| Abstract:To overcome the performance degradation of proton exchange membranes under high-temperature and low-humidity conditions， as well as their inadequate dimensional stability under high humidity， a construction strategy for nanocellulose-based proton exchage membranes (PEMs) was proposed. Sulfonated cellulose nanocrystals were first prepared via sulfuric acid hydrolysis followed by high-pressure homogenization. Subsequently， sulfonated metal-organic frameworks (UiO-66-SO3H) were grown in situ on carbon nanotubes (CNTs) surface to form hybrid fillers (S-UiO-66@CNT) with enhanced interfacial synergy. The SCNC@S-UiO-66@CNT composite membranes were then assembled through vacuum-assisted filtration. The resulting architecture effectively suppressed the aggregation of S-UiO-66@CNT and promoted uniform dispersion of fillers within the SCNCs matrix， thereby constructing continuous proton transport pathways. This hierarchical structure enhanced water adsorption and retention abilities， significantly improving the proton conductivity. At an optimized mass ratio of 10∶1 (S-UiO-66@CNT to SCNCs)， the composite membrane exhibited an outstanding tensile strength of 163 MPa and a remarkably low water swelling ratio of 7.1%. Notably， the proton conductivity reached 150.0 mS/cm at 80 ℃ and 100% relative humidity， and remained as high as 61.8 mS/cm even at 33% relative humidity. |
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