用于渗透能转换的受珍珠母启发的机械坚固薄膜,Advanced Functional Materials

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用于渗透能转换的受珍珠母启发的机械坚固薄膜
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-09-28 , DOI: 10.1002/adfm.202309869
Jun Rao ₁ , Ziwen Lv ₁ , Xueqing Yan ₁ , Jing Pan ₁ , Gegu Chen ₁ , Baozhong Lü ₁ , Feng Peng _{1,

2}

Affiliation

MXene 是一种新型 2D 层状材料，被认为是反电渗析 (RED) 薄膜的候选材料，因为带有带电官能团的层压 MXene 纳米通道提供了优异的离子选择性和导电性。然而，由于纳米片之间的结合力较差，MXene基离子交换膜的机械性能较弱且在水中不稳定，这限制了其红色性能。在这里，受天然珍珠层结构的启发，开发了一类具有高性能用于收集纳米流体渗透的阳离子-MXene/阳离子全纤维素纳米纤维（C-MXene/C-HNF）复合膜。C-HNF 充当联锁剂，通过氢键连接 MXene 纳米片，形成机械坚固且水稳定的薄膜。C-HNF的引入不仅增加了层间相互作用力，而且增强了离子传输通量。当C-HNF含量为20%时，复合膜的拉伸应力、断裂应变和韧性分别达到127.75±1.61 MPa、3.50±0.1%和2.95±0.52 MJ·m ^-3。此外，该复合薄膜在50倍盐度梯度（0.01/0.5 m NaCl）下可产生高达1.09 W m ⁻²的令人印象深刻的输出功率密度，并且50天后仅下降4.58%，表现出良好的稳定性和耐用性。

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Nacre-Inspired Mechanically Robust Films for Osmotic Energy Conversion

MXene, a new class of 2D layered materials, is considered a candidate for the reverse electrodialysis (RED) film because the laminated MXene nanochannels with charged functional groups provide an excellent ionic selectivity and conductivity. However, the MXene-based ion-exchange films suffer from weak mechanical properties and instability in water due to the poor binding force between the nanosheets, which limits their RED performance. Here, inspired by natural nacre structure, a class of cation-MXene/cation holocellulose nanofibers (C-MXene/C-HNF) composite film with high performance for harvesting nanofluidic osmotic is developed. C-HNF acts as interlocking agent to connect the MXene nanosheets by hydrogen bonding, resulting a mechanically robust and water stable film. The introduction of C-HNF not only increases the interlayer interaction force, but also enhances the ion transport flux. When the content of C-HNF is 20%, the tensile stress, fracture strain, and toughness of the composite film reach up to 127.75 ± 1.61 MPa, 3.50 ± 0.1%, and 2.95 ± 0.52 MJ m⁻³, respectively. Additionally, the composite film can produce an impressive output power density of up to 1.09 W m⁻² under a 50-fold salinity gradient (0.01/0.5 m NaCl), and only decreases by 4.58% after 50 days, demonstrating good stability and durability.

更新日期：2023-09-28

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