High-performance nanogenerators based on flexible cellulose nanofibril/MoS2 nanosheet composite piezoelectric films for energy harvesting

By Tao Wu, Zhuqun Shi, Dongning Liu, Siling Chen, C. Xiong, Quanling Yang. 2021

150 citations recorded by the source corpus.

Abstract High-performance and environment-friendly biomass-based piezoelectric films have drawn much attention recently. Here, 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibril (TOCN)/molybdenum disulfide (MoS2) nanosheet bionanocomposite piezoelectric films were prepared through an environmentally benign pathway by aqueous dispersion. The TOCN/MoS2 nanocomposite films exhibited good mechanical properties with the highest Young’s modulus of 8.2 GPa and tensile strength of 307 MPa. When the MoS2 content was 4 wt%, the longitudinal piezoelectric constant (d33) of the composite film reached a maximum value of 31 pC/N, much higher than 12 pC/N of the neat TOCN film and other reported cellulose-based piezoelectric films. Moreover, nanogenerators fabricated from TOCN/MoS2 composite films exhibited a maximum output voltage of 4.1 V and a short-circuit current of 0.21 μA. Furthermore, the current generated by the nanogenerator was rectified and converted to direct current. A 10 μF commercial capacitor was charged to 1.6 V at 120 s, indicating the ability to collect mechanical energy generated in the natural environment. Therefore, the TOCN/MoS2 composite films are promising in the field of piezoelectric materials and nanogenerators.

Subfields: Biomaterials, Biomedical Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/c264a51bb6ddbcacaa7fa5fb856ff11853fb7814