研究目的
To develop and characterize a novel piezoelectric energy harvester based on lead-free ceramics for efficient energy scavenging from low-frequency vibrations.
研究成果
The developed lead-free piezoelectric energy harvester demonstrates significant potential for low-frequency energy harvesting, achieving a power density of 22 μW/cm3. This work highlights the feasibility of sustainable materials in energy applications and suggests directions for further optimization in material composition and structural design to enhance performance.
研究不足
The harvester's performance is limited to low-frequency ranges and may not be optimal for high-frequency applications. The use of lead-free materials, while environmentally friendly, currently offers lower piezoelectric coefficients compared to lead-based alternatives, potentially restricting maximum power output.
1：Experimental Design and Method Selection:
The study involved designing a bimorph piezoelectric energy harvester using lead-free NKN-based ceramics. Theoretical models for piezoelectric response were employed, and the harvester was fabricated using standard ceramic processing techniques.
2：Sample Selection and Data Sources:
Samples were prepared from NKN-based piezoelectric ceramics, synthesized via solid-state reaction. Vibration data were collected using a shaker table to simulate low-frequency environments.
3：List of Experimental Equipment and Materials:
A shaker table (model: V406, brand: Ling Dynamic Systems) for vibration excitation, an accelerometer (model: 352C33, brand: PCB Piezotronics) for acceleration measurement, and a data acquisition system (model: NI-9234, brand: National Instruments) for signal processing.
4：Experimental Procedures and Operational Workflow:
The harvester was mounted on the shaker and subjected to sinusoidal vibrations at frequencies from 10 Hz to 100 Hz. Output voltage and power were measured across resistive loads.
5：Data Analysis Methods:
Data were analyzed using LabVIEW software to compute power density and efficiency. Statistical analysis was performed to ensure reproducibility.
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