Porous flexible molecular-based piezoelectric composite achieves milliwatt output power density

Area of Science:

• Materials Science
• Nanotechnology
• Energy Harvesting

Background:

• Molecular ferroelectrics show promising piezoelectric responses comparable to inorganic ceramics.
• Challenges remain in applying molecular ferroelectrics to flexible devices due to brittleness and low elastic moduli.

Purpose of the Study:

• To develop a flexible, porous composite piezoelectric material for enhanced energy harvesting.
• To overcome the mechanical limitations of molecular ferroelectrics in flexible applications.

Main Methods:

• Fabrication of a flexible porous composite using thermoplastic polyurethane (TPU) and [Me3NCH2Cl]CdCl3 (TMCM-CdCl3).
• Incorporation of a high doping ratio (50%) of TMCM-CdCl3 within the TPU porous structure.
• Characterization of piezoelectric properties and power output under mechanical loading.

Main Results:

• The composite achieved a superior power density of 636.9 µW cm⁻² (1273.9 µW cm⁻³).
• The porous TPU structure facilitated high doping and efficient stress absorption.
• Performance was significantly higher (2000x) than conventional flexible piezoelectric materials like PVDF.

Conclusions:

• The developed flexible porous composite piezoelectric material offers a viable solution for industrial applications of molecular ferroelectrics.
• This material demonstrates potential for high-density energy harvesting and self-powered flexible devices.
• The approach overcomes inherent brittleness and fracture issues of molecular ferroelectrics.