Achieving high-performance energy harvesting and self-powered sensing in a flexible cellulose nanofibril/MoS2/BaTiO3 composite piezoelectric nanogenerator. Issue 43 (27th October 2021)

• Record Type: Journal Article
• Authors: Xu, Menghan; Wu, Tao; Song, Yiheng; Jiang, Ming; Shi, Zhuqun; Xiong, Chuanxi; Yang, Quanling
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 43(2021)
• Page Start: 15552
• Page End: 15565
• Publication Date: 2021-10-27
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1tc03886a
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : The flexible high-performance TOCN/MoS2 /BaTiO3 composite film-based PENG is promising in energy harvesting as a novel power source and wearable self-powered sensing. Abstract : As good alternatives to conventional rigid piezoelectric materials, environment-friendly biomass-based piezoelectric nanocomposites comprising piezoelectric ceramic fillers and a natural polymer matrix are highly desirable for flexible piezoelectric nanogenerators (PENGs) with high output performance. In this work, composite piezoelectric films were successfully prepared through uniform assembly of MoS2 nanosheets and tetragonal BaTiO3 nanoparticles in a 2, 2, 6, 6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibril (TOCN) matrix using a facile, cost-effective and scalable method. The TOCN/MoS2 /BaTiO3 ternary composite film demonstrated excellent mechanical properties with the highest tensile strength of 335 MPa and outstanding piezoelectric properties with the maximum longitudinal piezoelectric constant ( d 33 ) of 45 pC N −1 much higher than that of other cellulose-based piezoelectric materials. Benefiting from the prominent performance of the flexible cellulose-based nanocomposite, the resulting flexible TOCN/MoS2 /BaTiO3 composite film-based PENG exhibited very high and stable output piezoelectric signals: namely, a maximum open-circuit voltage of 8.2 V and a maximum short-circuit current of 0.48 μA. Furthermore, the electricity generated by the PENG illuminated a LED directly or charged a 10 μF capacitor up to 3.1 V at 110 s. With high flexibility and sensitivity, the innovative device can work not only as a self-powered motion sensor to detect tiny forces in the environment and in human motion, but also as an electronic skin with good pyroelectric properties to monitor the temperature. Thus, this research provides new insights into the design and preparation of lightweight and simple-structure PENGs with high flexibility and remarkable piezoelectric performance, presenting great potential in the development of efficient mechanical energy harvesters, active sensor networks and wearable electronics.