Engineering Textile Electrode and Bacterial Cellulose Nanofiber Reinforced Hydrogel Electrolyte to Enable High‐Performance Flexible All‐Solid‐State Supercapacitors. Issue 12 (9th February 2021)

• Record Type: Journal Article
• Authors: Li, Xiaolong; Yuan, Libei; Liu, Rong; He, Hanna; Hao, Junnan; Lu, Yan; Wang, Yuanming; Liang, Gemeng; Yuan, Guohui; Guo, Zaiping
• Is Part Of: Advanced energy materials. Volume 11:Issue 12(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-02-09
• Subjects: all solid state -- fibers -- supercapacitors -- textile -- wearable applications; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202003010
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: The fabrication of highly durable, flexible, all‐solid‐state supercapacitors (ASCs) remains challenging because of the unavoidable mechanical stress that such devices are subjected to in wearable applications. Natural/artificial fiber textiles are regarded as prospective materials for flexible ASCs due to their outstanding physicochemical properties. Here, a high‐performance ASC is designed by employing graphene‐encapsulated polyester fiber loaded with polyaniline as the flexible electrodes and bacterial cellulose (BC) nanofiber‐reinforced polyacrylamide as the hydrogel electrolyte. The ASC combines the textile electrode capable of arbitrary deformation with the BC‐reinforced hydrogel with high ionic conductivity (125 mS cm −1 ), high tensile strength (330 kPa), and superelasticity (stretchability up to ≈1300%), giving rise to a device with high stability/compatibility between the electrodes and electrolyte that is compliant with flexible electronics. As a result, this ASC delivers high areal capacitance of 564 mF cm −2, excellent rate capability, good energy/power densities, and more importantly, superior mechanical properties without significant capacitance degradation after repeated bending, confirming the functionality of the ASC under mechanical deformation. This work demonstrates an effective design for a sufficiently tough energy storage device, which shows great potential in truly wearable applications. Abstract : A flexible supercapacitor with high stability/compatibility is developed by employing graphene‐encapsulated polyester fiber loaded polyaniline as the flexible electrodes, bacterial cellulose nanofiber‐reinforced polyacrylamide as the hydrogel electrolyte. The device delivers high electrochemical performance under mechanical deformation and confirms the functionality for wearable energy storages. This work demonstrates an effective design for durable flexible supercapacitors.