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Chemical Engineering Journal

Chemical Engineering Journal

IF: 13.3
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A combined genetic modification and chemical engineering strategy for designing high-performance cellulose nanofibrils separators

Published:9 December 2024 DOI: 10.1016/j.cej.2024.158402
Ling-Hua Xu, Peng-Fei Wang, Ying Xu, Jing Liu, Xiao-Peng Peng, Jia Liu, Xiao-Jun Shen, Jia-Long Wen, Quanzi Li, Tong-Qi Yuan

Abstract

Cellulose nanofibrils (CNFs) emerge as prime candidates for fabricating separators in energy storage devices due to their unique structural properties and sustainability. However, conventionally prepared CNFs via chemical and physical methods are difficult to regulate the intrinsic properties, which limits the development of high-performance CNF separators. Herein, we designed a combinatorial strategy consisting of genetic modification and chemical treatment to successfully fabricate an ultrathin (25?μm), high mechanical strength (96?MPa) and porosity (63?%) CNFs separators for supercapacitors. Maleic anhydride (MAH) treatment effectively removed lignin and hemicelluloses in poplar wood, and obtained the esterified CNFs with high stability after a short time ultrasonication. The mild alkali treatment process restored the hydroxyl groups on the surface of CNFs and promoted the reconstruction of the hydrogen bond network, which improved the mechanical properties of the CNFs separators. Importantly, genetic modification achieved more favorable pore structure and electrolyte wettability than wild-type CNFs by increasing the width of CNFs to a greater extent. With these advantages, the assembled symmetric capacitors (SCs) and zinc-ion hybrid capacitors (ZIHCs) exhibited excellent capacitance and long-term cycling stability than of commercial separators. This integrated strategy promotes a more sustainable and efficient conversion of cellulose fibers and provides valuable insights into the development of nanocellulose-based separators.

Substances (2)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Sodium hydroxide 1310-73-2 NaOH 1357 suppliers $14.00-$17490.00
Sodium sulfate 7757-82-6 Na2SO4 1035 suppliers $6.00-$3655.00

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