Ferroelectricity and Piezoelectric Energy Harvesting of Hybrid A2BX4-Type Halogenocuprates Stabilized by Phosphonium Cations Article Swipe
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· 2021
· Open Access
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· DOI: https://doi.org/10.1021/acsmaterialsau.1c00046
· OA: W3211912373
Perovskite-structured compounds containing organic cations and inorganic anions have gained prominence as materials for next-generation electronic and energy devices. Hybrid materials possessing ferro- and piezoelectric properties are in recent focus for mechanical energy harvesting (nanogenerator) applications. Here, we report the ferroelectric behavior of A<sub>2</sub>BX<sub>4</sub>-type halogenocuprate materials supported by heteroleptic phosphonium cations. These lead-free discrete Cu(II) halides [Ph<sub>3</sub>MeP]<sub>2</sub>[CuCl<sub>4</sub>] (<b>1</b>) and [Ph<sub>3</sub>MeP]<sub>2</sub>[CuBr<sub>4</sub>] (<b>2</b>) exhibit a remnant polarization (<i>P</i> <sub>r</sub>) of 17.16 and 26.02 μC cm<sup>-2</sup>, respectively, at room temperature. Furthermore, flexible polymer films were prepared with various weight percentage (wt %) compositions of <b>1</b> in thermoplastic polyurethane (TPU) and studied for mechanical energy harvesting applications. A highest peak-to-peak voltage output of 25 V and power density of 14.1 μW cm<sup>-2</sup> were obtained for the optimal 15 wt % <b>1</b>-TPU composite film. The obtained output voltages were utilized for charging a 100 μF electrolytic capacitor that reaches its maximum charging point within 30 s with sizable stored energies and accumulated charges.
