Directional freeze-drying of PVDF-MoS2 composites for enhanced piezoelectric performance in triboelectric nanogenerators

IF 6.5 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2025-03-20 DOI:10.1016/j.coco.2025.102373

Junru Zhu , Dinku Hazarika , Jie Li , Jiaqi Lu , Kaihang Zhang , Liangquan Xu , Jianhui Wu , Zhen Cao , Hao Jin , Jikui Luo

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引用次数: 0

Abstract

Poly(vinylidene fluoride) (PVDF), a piezoelectric polymer, exhibits excellent flexibility, ease of fabrication, and biocompatibility, with its β-phase being most electroactive. Enhancing β-phase content in PVDF via nanofiller incorporation often faces challenges like aggregation, poor dispersion and limited phase transition efficiency. To address this, we utilized a directional freeze-drying technique to embed 2-dimensional piezoelectric molybdenum disulfide (MoS₂) nanosheets (NSs) into the PVDF matrix. This method facilitates the vertical alignment of MoS₂ NSs within the PVDF matrix, promoting the formation of the β-phase and significantly enhancing the piezoelectric performance without the need of external high-voltage poling. The resulting composite achieved an 86.28 % β-phase content and a piezoelectric coefficient (d₃₃) of 13.3 p.m./V at 2.0 wt% MoS₂ NSs for the PVDF composite polymer. When applied in a triboelectric nanogenerator, the device delivered a peak output voltage of 1121 V and a power density of 16.2 W m⁻², showcasing promising potential for energy-harvesting applications.

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.