Stabilization of Ferroelectric Domains via Interfacial Strain in HoFeO3- BaTiO3 Nanofiber Heterostructures for Enhanced Hybrid Energy Harvesting
Abstract
Piezoelectric nanogenerators (PENGs) are an attractive platform for self-powered mechanical-energy harvesting, but their output is often limited by depolarization fields, charge leakage, and inefficient stress transfer to the active dipoles, particularly in polymer-dominated composites. Here we report HoFeO3-BaTiO3 (HFO-BTO) nanofiber heterostructures prepared by alternating sol-gel electrospinning, in which orthorhombic HoFeO3 (Pbnm) and tetragonal BaTiO3 (P4mm) coexist in intimate contact. Rietveld-refined X-ray diffraction, high-resolution transmission electron microscopy, and Raman spectroscopy indicate interfacial lattice distortion. Polarization-electric field loops show that the heterostructure retains a polarization comparable to that of BaTiO3 (16.39 vs 15.80 microcoulombs per square centimeter at zero field) while its switching-current maximum moves to a higher field (about 7 vs about 3.5 kilovolts per centimeter), consistent with strain-stabilized ferroelectric domains. When the nanofibers are encapsulated in polydimethylsiloxane (PDMS) and excited under cyclic impact, the device produces a hybrid output: the piezoelectric response of the strained BaTiO3 is supplemented by a triboelectric contribution from contact electrification. The HFO-BTO device delivers open-circuit voltage peaks of about +6 volts and -8 volts and a power density of 24.31 microwatts per cubic centimeter at a 4.7 megaohm load. This is 2.4 times the value for an identically fabricated BaTiO3 device (10.00 microwatts per cubic centimeter) and 8.7 times that of the HoFeO3 device (2.78 microwatts per cubic centimeter). These results link interface-driven lattice distortion to improved electromechanical output and identify all-oxide nanofiber heterostructures as a promising route to lead-free energy harvesting.
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BibTeX
@misc{chaturvedi2026stabilization,
title = {{Stabilization of Ferroelectric Domains via Interfacial Strain in HoFeO3- BaTiO3 Nanofiber Heterostructures for Enhanced Hybrid Energy Harvesting}},
author = {Smita Chaturvedi and Swathi Krishna and Shivshankar Jokare and Supriya Sahoo and Vikash Kushwaha and Priyank Shyam and Mandar Shirolkar and R. Boomishankar},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.26611},
eprint = {2610.26611},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.26611},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Stabilization of Ferroelectric Domains via Interfacial Strain in HoFeO3- BaTiO3 Nanofiber Heterostructures for Enhanced Hybrid Energy Harvesting
AU - Smita Chaturvedi
AU - Swathi Krishna
AU - Shivshankar Jokare
AU - Supriya Sahoo
AU - Vikash Kushwaha
AU - Priyank Shyam
AU - Mandar Shirolkar
AU - R. Boomishankar
PY - 2026
DA - 2026/10/19
PB - arXiv
DO - 10.48550/arxiv.2610.26611
UR - https://arxiv.org/abs/2610.26611
AB - Piezoelectric nanogenerators (PENGs) are an attractive platform for self-powered mechanical-energy harvesting, but their output is often limited by depolarization fields, charge leakage, and inefficient stress transfer to the active dipoles, particularly in polymer-dominated composites. Here we report HoFeO3-BaTiO3 (HFO-BTO) nanofiber heterostructures prepared by alternating sol-gel electrospinning, in which orthorhombic HoFeO3 (Pbnm) and tetragonal BaTiO3 (P4mm) coexist in intimate contact. Rietveld-refined X-ray diffraction, high-resolution transmission electron microscopy, and Raman spectroscopy indicate interfacial lattice distortion. Polarization-electric field loops show that the heterostructure retains a polarization comparable to that of BaTiO3 (16.39 vs 15.80 microcoulombs per square centimeter at zero field) while its switching-current maximum moves to a higher field (about 7 vs about 3.5 kilovolts per centimeter), consistent with strain-stabilized ferroelectric domains. When the nanofibers are encapsulated in polydimethylsiloxane (PDMS) and excited under cyclic impact, the device produces a hybrid output: the piezoelectric response of the strained BaTiO3 is supplemented by a triboelectric contribution from contact electrification. The HFO-BTO device delivers open-circuit voltage peaks of about +6 volts and -8 volts and a power density of 24.31 microwatts per cubic centimeter at a 4.7 megaohm load. This is 2.4 times the value for an identically fabricated BaTiO3 device (10.00 microwatts per cubic centimeter) and 8.7 times that of the HoFeO3 device (2.78 microwatts per cubic centimeter). These results link interface-driven lattice distortion to improved electromechanical output and identify all-oxide nanofiber heterostructures as a promising route to lead-free energy harvesting.
ER -