摘要
Transparent,flexible,and high-performance triboelectric nanogenerator(TENG)from nature-derived materials are required for sustainable society development.However,low triboelectricity from natural material is generally observed.Tunable electronic band diagram(EBD)through facile manipulation is one of the efficient methods to promote the TENG output,requiring fundamental,in depth understanding.Herein,we employed the high quality,single crystal-like Ti_(2)NbO_(7)nanosheets(NSs)with dual dielectric and semiconducting properties as filler for bacterial cellulose(BC)-based TENG.Several techniques including X-ray diffraction(XRD),scanning electron microscopy(SEM),atomic force microscopy(AFM),ultraviolet–visible(UV–vis)absorption,energy dispersive X-ray spectroscopy(EDS),and synchrotron radiation X-ray tomographic microscopy(SRXTM)were applied to characterize the long-range structure,microstructure,optical properties,elemental composition,and three-dimensional(3D)distribution of components in the composites.The semi-transparent and flexible 5 vol.%Ti_(2)NbO_(7)NSs/BC preserved the integrity of cellulose,contained well-dispersed nanosheets,reduced optical band gap(4.20 vs.5.75 eV for BC),and increased surface roughness.The dielectric permittivity and conductivity increased with nanosheets content.Adding negatively-charged Ti_(2)NbO_(7)NSs could regulate the charge affinity of BC composite via shifting of Fermi energy over that of Al.It is found that adding 5 vol.%NSs into the BC film improved electrical outputs(~36 V and~8.8μA),which are 2–4 times higher than that of pure BC,even when paired with Al which lies adjacent in triboelectric series.Our work demonstrated the method to enhance BC-based TENG performance through EBD regulation using multifunctional Ti_(2)NbO_(7)NSs.
基金
funded by the Office of the Permanent Secretary,Ministry of Higher Education,Science,Research and Innovation(OPS MHESI),Thailand Science Research and Innovation(TSRI)and King Mongkut’s University of Technology North Bangkok(No.RGNS 63-233),and the Faculty of Science,Energy and Environment,King Mongkut’s University of Technology North Bangkok(No.SCIEE-KMUTNB-64-002)
funded by the King Mongkut’s Institute of Technology Ladkrabang(KMITL)(No.KREF116501)
supported by the OPS MHESI,TSRI and Srinakharinwirot University(No.RGNS 64-211).