Enhanced energy harvesting performance of triboelectric nanogenerator via efficient dielectric modulation dominated by interfacial interaction. (February 2022)

• Record Type: Journal Article
• Authors: Song, Zhongqian; Li, Weiyan; Kong, Huijun; Bao, Yu; Wang, Ning; Wang, Wei; Ma, Yingming; He, Ying; Gan, Shiyu; Niu, Li
• Is Part Of: Nano energy. Volume 92(2022)
• Publication Date: 2022-02
• Subjects: Triboelectric nanogenerator -- Dielectric modulation -- Interfacial interactions -- Ti3CNTx MXene -- Ti3C2Tx MXene; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2021.106759
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: A long-standing hurdle in triboelectric nanogenerator (TENG) is to boost the output performances, which is a prerequisite for practical applications in portable or distributed power sources. Dielectric modulation of the triboelectric materials has proved as an efficient strategy to tackle this challenge by optimizing their charge trapping capacity and surface charge density. Herein, we introduce two kinds of typical two-dimensional transition metal carbide (Ti3 C2 Tx ) and carbonitride (Ti3 CNTx ) MXene into poly(vinylidene difluoride) (PVDF) ferroelectric polymers to achieve efficient dielectric modulation. Surprisingly, the nitrogen atoms partially and randomly substituting carbon atoms in Ti3 C2 Tx endow Ti3 CNTx with more abundant surface terminating groups (–OH and –F) and additional –NH groups, providing strong interfacial interactions, enhanced compatibility with PVDF matrix and dielectric polarization locking. These unique characteristics enable efficient dielectric modulation of PVDF/Ti3 C2 Tx and PVDF/Ti3 CNTx films, significantly enhancing their charge trapping capacity and surface charge density. The optimized TENG device based on PVDF/Ti3 CNTx exhibits higher maximum instantaneous power density of 2.5 W/m 2 than the devices based on PVDF/Ti3 C2 Tx (1.6 W/m 2 ) and pristine PVDF (0.4 W/m 2 ). This finding provides guidance for designing advanced triboelectric materials but also call for more exploration for fundamental mechanisms behind dielectric modulation. Graphical Abstract: ga1 Highlights: Two kinds of MXene (Ti3 C2 Tx and Ti3 CNTx ) are introduced into PVDF to achieve efficient dielectric modulation. Ti3 CNTx possesses more abundant –OH, –F and additional –NH groups, contributing to effective dielectric modulation. The instantaneous power density of PVDF/Ti3 CNTx based TENG device increases by 6 times at a weight fraction of 0.4 wt%.