Ti3C2-induced phase and interfacial effects in PVDF composites on the triboelectric behavior

Le résumé fourni par la source

Triboelectric nanogenerators (TENGs) have emerged as promising candidates for sustainable energy harvesting and self-powered sensing due to their structural simplicity, scalability, and adaptability. In this work, multi-layer Ti 3 C 2 T x was incorporated into poly(vinylidene fluoride) (PVDF) at different concentrations via drop-casting to investigate the influence of MXene incorporation on the structural, dielectric, tribological, and triboelectric properties of the resulting composite films. Structural characterization by X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR) revealed that MXenes promote the transformation of PVDF towards the electroactive β-phase through interfacial interactions between PVDF dipoles and MXenes’ surface terminations. Dielectric measurements demonstrated a progressive increase in dielectric constant with increasing MXene content, which was attributed to the combined effects of enhanced β-phase formation and interfacial polarization. Tribological experiments showed that low MXene loadings (2 wt%) had only a marginal influence on friction compared with neat PVDF, whereas higher contents led to a pronounced increase in coefficient of friction due to increased surface heterogeneity and roughness. The triboelectric characterization confirmed an improved electrical output for MXene-containing composites in both contact-separation and sliding modes. The highest open-circuit voltages reached approximately 17.5 V for the composite containing 20 wt% in contact-separation mode, while 20.5 V were achieved for 8 wt% in sliding mode. The enhanced triboelectric response is attributed to MXene-induced modulation of the interfacial electronic structure, including an increased density of electronic states and trap-state formation, facilitating charge transfer and suppressing charge recombination. Based on the experimental observations, a mechanism is proposed linking interfacial electronic states, charge trapping, and triboelectric charge transport in MXene-PVDF composites. Our findings provide further insights into structure–property-performance relationships in MXene-based triboelectric materials and contribute to the design of advanced polymer-based triboelectric systems for sustainable energy harvesting applications.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.