Qin Haili, Liu Ping, Chen Chuanrui, Cong Huai-Ping, Yu Shu-Hong
Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, P. R. China.
Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Institute of Energy, Hefei Comprehensive National Science Center, Department of Chemistry, Institute of Biomimetic Materials & Chemistry, University of Science and Technology of China, Hefei, P. R. China.
Nat Commun. 2021 Jul 14;12(1):4297. doi: 10.1038/s41467-021-24568-w.
Self-healability is essential for supercapacitors to improve their reliability and lifespan when powering the electronics. However, the lack of a universal healing mechanism leads to low capacitive performance and unsatisfactory intelligence. Here, we demonstrate a multi-responsive healable supercapacitor with integrated configuration assembled from magnetic FeO@Au/polyacrylamide (MFP) hydrogel-based electrodes and electrolyte and Ag nanowire films as current collectors. Beside a high mechanical strength, MFP hydrogel exhibits fast optical and magnetic healing properties arising from distinct photothermal and magneto-thermal triggered interfacial reconstructions. By growing electroactive polypyrrole nanoparticles into MFP framework as electrodes, the assembled supercapacitor exhibits triply-responsive healing performance under optical, electrical and magnetic stimuli. Notably, the device delivers a highest areal capacitance of 1264 mF cm among the reported healable supercapacitors and restores ~ 90% of initial capacitances over ten healing cycles. These prominent performance advantages along with the facile device-assembly method make this emerging supercapacitor highly potential in the next-generation electronics.
自修复能力对于超级电容器在为电子设备供电时提高其可靠性和使用寿命至关重要。然而，缺乏通用的修复机制会导致电容性能低下和智能性不尽人意。在此，我们展示了一种具有集成结构的多响应自修复超级电容器，它由基于磁性FeO@Au/聚丙烯酰胺（MFP）水凝胶的电极、电解质以及作为集流体的银纳米线薄膜组装而成。除了具有高机械强度外，MFP水凝胶还表现出快速的光学和磁性修复特性，这源于独特的光热和磁热触发的界面重构。通过在MFP框架中生长电活性聚吡咯纳米颗粒作为电极，组装好的超级电容器在光学、电学和磁刺激下表现出三重响应的修复性能。值得注意的是，在已报道的自修复超级电容器中，该器件的最高面积电容为1264 mF/cm²，并且在十个修复循环后可恢复约90%的初始电容。这些突出的性能优势以及简便的器件组装方法使得这种新型超级电容器在下一代电子设备中极具潜力。
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