用于超级电容器和传感器应用的富含 Fe3+、高导电性木质素水凝胶的设计,Biomacromolecules

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用于超级电容器和传感器应用的富含 Fe3+、高导电性木质素水凝胶的设计
Biomacromolecules ( IF 5.5 ) Pub Date : 2022-01-20 , DOI: 10.1021/acs.biomac.1c01194
Ajoy Kanti Mondal _{1,

2} , Dezhong Xu ₁ , Shuai Wu ₁ , Qiuxia Zou ₁ , Fang Huang ₁ , Yonghao Ni _{1,

3}

Affiliation

制备用于柔性电子应用的具有可调机械性能的基于天然聚合物的高导电水凝胶仍然具有挑战性。在此，我们报道了一种通过以下两步工艺制备基于木质素的富含 Fe ³⁺的高导电性水凝胶的简便方法：（1）通过将磺化木质素与聚（乙二醇）二缩水甘油酯交联制备木质素水凝胶。醚 (PEGDGE) 和 (2) Fe ³⁺离子通过简单地浸泡在 FeCl ₃中浸渍到木质素水凝胶中。受益于 Fe ³⁺离子与邻苯二酚基团和木质素中的其他官能团络合，所得水凝胶具有独特的性能，例如高电导率（高达 6.69 S·m ^–1) 以及优异的机械和疏水性能。作为应变传感器，所制备的木质素水凝胶在检测各种人体运动时表现出高灵敏度。随着潮湿空气的流动，富含 Fe ³⁺的木质素水凝胶产生 162.8 mV 的输出电压。组装的水凝胶电解质超级电容器具有 301.8 F·g ^–1的高比电容，最大能量密度为 26.73 Wh·kg ^–1，功率密度为 2.38 kW·kg ^–1，电容保持率为 94.1 10 000 次连续充放电循环后的百分比。这些结果支持了木质素基 Fe ^{3+的结论。}富含高导电性的水凝胶在传感器和超级电容器等不同领域具有广阔的应用前景，为木质素的增值利用提供了新平台。

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Design of Fe3+-Rich, High-Conductivity Lignin Hydrogels for Supercapacitor and Sensor Applications

Preparation of natural polymer-based highly conductive hydrogels with tunable mechanical properties for applications in flexible electronics is still challenging. Herein, we report a facile method to prepare lignin-based Fe³⁺-rich, high-conductivity hydrogels via the following two-step process: (1) lignin hydrogels are prepared by cross-linking sulfonated lignin with poly(ethylene glycol) diglycidyl ether (PEGDGE) and (2) Fe³⁺ ions are impregnated into the lignin hydrogel by simply soaking in FeCl₃. Benefiting from Fe³⁺ ion complexation with catechol groups and other functional groups in lignin, the resultant hydrogels exhibit unique properties, such as high conductivity (as high as 6.69 S·m^–1) and excellent mechanical and hydrophobic properties. As a strain sensor, the as-prepared lignin hydrogel shows high sensitivity when detecting various human motions. With the flow of moist air, the Fe³⁺-rich lignin hydrogel generates an output voltage of 162.8 mV. The assembled supercapacitor of the hydrogel electrolyte demonstrates a high specific capacitance of 301.8 F·g^–1, with a maximum energy density of 26.73 Wh·kg^–1, a power density of 2.38 kW·kg^–1, and a capacitance retention of 94.1% after 10 000 consecutive charge–discharge cycles. These results support the conclusion that lignin-based Fe³⁺-rich, high-conductivity hydrogels have promising applications in different fields, including sensors and supercapacitors, rendering a new platform for the value-added utilization of lignin.

更新日期：2022-01-20

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