Piezoelectric nanogenerator based on lead-free BiFeO3:Sr perovskite

The current work reports the synthesis of Bi1-xSrxFeO3 (SBFO; x = 0.0, 0.15, 0.25, 0.35) nanoparticles by solgel method and study of its structural and piezoelectric properties. X-ray diffraction identifies the phase transformation from rhombohedral to cubic of BiFeO3 upon doping of Sr. X-ray photoemission spectroscopy revealed that Sr doped BiFeO3 nanoparticles are rich with oxygen vacancies compared to the bare BiFeO3 nanoparticles. The highest maximal polarization value of 6.74 mu C cm(-2) and remnant polarization 4.20 mu C cm(-2) are observed for BiFeO3 with 25% of Sr. The SBFO-PENG with 25% of Sr content device provides output voltage and current of 6.35 V and 0.64 mu A under pushing tester with 1 Hz frequency, which is higher to that for a bare BiFeO3 PENG. It also exhibits high mechanical robustness, and much stable and durable output even after 1500 s. A maximum power density of similar to 0.31 mu Wcm(-2) was achieve at a resistive load of 10(8) Omega. The SBFO-PENG device's feasibility is tested by trigging commercial electronics such as charging capacitors and lighting the LED, and it can drive a 0.47 mu F capacitor to store the energy of 7.29 mu J within 500 s under pushing tester. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

This work reports the synthesis of Bi1-xSrxFeO3 (SBFO; x = 0.0, 0.15, 0.25, 0.35) nanoparticles by solgel method and investigates their structural and piezoelectric properties. The study reveals the phase transformation from rhombohedral to cubic of BiFeO3 upon Sr doping, as well as the enrichment of oxygen vacancies in Sr-doped BiFeO3 nanoparticles. The SBFO-PENG device with 25% Sr content shows the highest maximal polarization value and remnant polarization, along with improved output voltage and current compared to a bare BiFeO3 PENG. It also demonstrates high mechanical robustness and stable output even after extended periods of operation. The feasibility of the SBFO-PENG device is demonstrated by successfully triggering commercial electronics and energy storage in a capacitor.