Wang Yutian, Shi Yunhui, Gu Yifan, Xue Pan, Xu Xinhua
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300072, China.
Materials (Basel). 2021 Apr 8;14(8):1852. doi: 10.3390/ma14081852.
Most reported wearable electronic devices lack self-healing chemistry and flexible function to maintain stable energy output while irreversible damages and complex deformations. In this work, we report a dual-dynamic network electrolyte synthesized by micellar elastomers introduced into strong hydrogel matrix. The gel electrolyte is fabricated by physically cross-linking the borax-polyvinyl alcohol (B-PVA) network as tough matrix and poly (ethylene oxide) (PEO)-poly (propylene oxide) (PPO)-poly (ethylene oxide) (Pluronic) to frame elastic network, followed by immersion in potassium chloride solution. Under the action of dynamic borate ester bond and multi-network hydrogen bond, the as-prepared electrolyte exhibits high stretchability (1535%) and good self-healing efficiency. Based on the electrolyte, we assemble the interfacial compatible micro-supercapacitor (MSC) by multi-walled carbon nanotubes (MWCNT) interdigital electrode printed on cellulosic paper by direct ink writing (DIW) technique. Thanks to the large specific area and compressive deformation resistance of cellulosic paper, the MSC with tightly interfacial contact achieves high volumetric capacitance of 801.9 mF cm at the current density of 20 μA cm. In the absence of stimulation of the external environment, the self-healing MSC demonstrates an ideal capacity retention (90.43%) after five physical damaged/healing cycles. Our research provides a clean and effective strategy to construct wearable MSC.
大多数已报道的可穿戴电子设备缺乏自修复性能和灵活功能，难以在遭受不可逆损坏和复杂变形时维持稳定的能量输出。在本工作中，我们报道了一种通过将胶束弹性体引入强水凝胶基质中合成的双动态网络电解质。该凝胶电解质是通过将硼砂-聚乙烯醇（B-PVA）网络物理交联作为坚韧基质，并与聚环氧乙烷（PEO）-聚环氧丙烷（PPO）-聚环氧乙烷（Pluronic）构建弹性网络，随后浸入氯化钾溶液中制备而成。在动态硼酸酯键和多网络氢键的作用下，所制备的电解质表现出高拉伸性（1535%）和良好的自修复效率。基于该电解质，我们通过直接墨水书写（DIW）技术在纤维素纸上印刷多壁碳纳米管（MWCNT）叉指电极，组装了界面兼容的微型超级电容器（MSC）。由于纤维素纸的大比表面积和抗压变形能力，具有紧密界面接触的MSC在20 μA cm的电流密度下实现了801.9 mF cm的高体积电容。在没有外部环境刺激的情况下，自修复MSC在经历五次物理损伤/修复循环后表现出理想的容量保持率（90.43%）。我们的研究为构建可穿戴MSC提供了一种清洁有效的策略。
