Freeze cast porous barium titanate for enhanced piezoelectric energy harvesting

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Energy harvesting is an important developing technology for a new generation of self-powered sensor networks. This paper demonstrates the significant improvement in the piezoelectric energy harvesting performance of barium titanate by forming highly aligned porosity using freeze casting. Firstly, a finite element model demonstrating the effect of pore morphology and angle with respect to poling field on the poling behaviour of porous ferroelectrics was developed. A second model was then developed to understand the influence of microstructure-property relationships on the poling behaviour of porous freeze cast ferroelectric materials and their resultant piezoelectric and energy harvesting properties. To compare with model predictions, porous barium titanate was fabricated using freeze casting to form highly aligned microstructures with excellent longitudinal piezoelectric strain coefficients, d 33. The freeze cast barium titanate with 45 vol.% porosity had a d 33 = 134.5 pC N-1 compared to d 33 = 144.5 pC N-1 for dense barium titanate. The d 33 coefficients of the freeze cast materials were also higher than materials with uniformly distributed spherical porosity due to improved poling of the aligned microstructures, as predicted by the models. Both model and experimental data indicated that introducing porosity provides a large reduction in the permittivity () of barium titanate, which leads to a substantial increase in energy harvesting figure of merit, , with a maximum of 3.79 pm2 N-1 for barium titanate with 45 vol.% porosity, compared to only 1.40 pm2 N-1 for dense barium titanate. Dense and porous barium titanate materials were then used to harvest energy from a mechanical excitation by rectification and storage of the piezoelectric charge on a capacitor. The porous barium titanate charged the capacitor to a voltage of 234 mV compared to 96 mV for the dense material, indicating a 2.4-fold increase that was similar to that predicted by the energy harvesting figures of merit.

LanguageEnglish
Article number225301
Pages1-18
Number of pages18
JournalJournal of Physics D: Applied Physics
Volume51
Issue number22
Early online date9 Apr 2018
DOIs
StatusPublished - 8 May 2018

Fingerprint

Barium titanate
Energy harvesting
barium
casts
porosity
Porosity
energy
figure of merit
microstructure
Microstructure
Ferroelectric materials
capacitors
Casting
Capacitors
ferroelectric materials
rectification
coefficients
Sensor networks
Permittivity
permittivity

Keywords

  • energy harvesting
  • finite element analysis
  • freeze casting
  • piezoelectric
  • porosity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

Freeze cast porous barium titanate for enhanced piezoelectric energy harvesting. / Roscow, J. I.; Zhang, Y.; Kraśny, M. J.; Lewis, R. W.C.; Taylor, J.; Bowen, C. R.

In: Journal of Physics D: Applied Physics, Vol. 51, No. 22, 225301, 08.05.2018, p. 1-18.

Research output: Contribution to journalArticle

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