A tough organohydrogel-based multiresponsive sensor for a triboelectric nanogenerator and supercapacitor toward wearable intelligent devices. Issue 22 (20th May 2022)

• Record Type: Journal Article
• Authors: Hu, Kui; Zhao, Zhipeng; Wang, Yingyue; Yu, Longhuo; Liu, Kai; Wu, Hui; Huang, Liulian; Chen, Lihui; Ni, Yonghao
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 22(2022)
• Page Start: 12092
• Page End: 12103
• Publication Date: 2022-05-20
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta01503j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Tough organohydrogel-based devices were developed by incorporating graphene oxide-functionalized MXene nanosheets into a polyvinyl alcohol matrix. Abstract : Hydrogels are usually utilized as materials to fabricate multiresponsive sensors, triboelectric nanogenerators, and supercapacitors, respectively, in wearable devices applications. In order to develop an organohydrogel-based multiresponsive sensor for a triboelectric nanogenerator and supercapacitor, a tough organohydrogel with a triple-network structure was fabricated from poly(vinyl alcohol) (PVA), sodium alginate (SA), and cellulose nanofibrils (CNFs). Due to its unique structure, the hydrogel exhibited a high toughness of 24.5 kJ m −2 . Conductive MXene (MX) nanosheets were functionalized by graphene oxide (GO) to form stable and homogeneous nanocomposites, which were introduced into the organohydrogel matrix as conductive fillers. The MX–GO nanocomposites imparted a high gauge factor (GF) of 2.77 and multiple sensing to the organohydrogel-based sensor such as direction recognition tensile strain sensing, ultra-sensitive pressure strain sensing, and temperature sensing. Meanwhile, the triboelectric nanogenerator (TENG) and supercapacitor were assembled separately with the MX–GO organohydrogel. The short-circuit current ( I SC ), open-circuit voltage ( V OC ), and short-circuit charge quantity ( Q SC ) of the organohydrogel-based TENG in a single-electrode mode achieved 8.7 μA, 145 V, and 42.9 nC, respectively. The organohydrogel-based supercapacitor also showed a high specific capacitance of 5.4 F g −1 and excellent cycling stability (98.2% capacitance retention after 1500 cycles). Therefore, this design approach for organohydrogel-based devices could open a new route for the development of next-generation wearable intelligent devices.