Recently, Professor Shuxiang Dong’s group in College of Engineering, Peking University, has made an important progress in high-temperature piezoelectric vibration energy harvester. The article entitled “High-Temperature BiScO3-PbTiO3 Piezoelectric Vibration Energy Harvester” was published in the journal Advanced Functional Materials (IF=11.382). URL:
Nowadays, energy materials is experiencing a rapid development, especially for those materials intended for harvesting thermal energy, wind energy, electromagnetic energy, and ambient vibration energy, etc. Most of the reported energy material is limited by their working temperature around room temperature. For example, the traditional cantilever-type piezoelectric energy harvesters based on PZT ceramics are restricted at high-temperature due to their relative low Curie temperature, and their composite structure involved with organic epoxy resin. However, with the fast development of wireless sensor network, it has been an urgent issue for wireless sensors to be self-powered in high temperature circumstance, e.g. the self-test, sense and communication of critical structures in internal combustion engines or nuclear power plants.
The output voltage as functions of temperature and frequency
Dong’s group developed a kind of modified bismuth scandium lead titanate (BiScO3-PbTiO3) piezoelectric ceramic, of which the Curie temperature is as high as 450?C, in contrast with the low Curie temperature of traditional PZT ceramic that in a range of 200-350?C. The modified material improved the property stability of the device, based on which a new type energy harvester was designed, aiming for harvesting vibration energy in high temperature environment. It is found that, under 1 g (peak-to-peak value) acceleration excitation, the maximum output power of piezoelectric cantilever was 13 μW at room temperature, and it becomes almost double at 150-200?C. It also can be deduced that an output power of milliwatt may be achieved by further modifying the materials and device structure. Experiment results show that the proposed energy harvester has the potential to be the power source of wireless sensor network in high temperature circumstance.
This work was carried out by Ph.D. candidate Jingen Wu from Department of Materials Science and Engineering, College of Engineering, PKU, under the supervision of Prof. Shuxiang Dong. It was sponsored by the National Natural Science Foundation of China and the Beijing Municipal Science and Technology Projects.