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Harvesting energy from steam using a soft biomimetic actuator


Mr. Li Hao

MPhil candidate in the Mechanical Engineering Dept.

Date & Time

Wednesday, 20 April 2022

3:00 am


Via Zoom


Exhaust steam contains abundant energy, yet there is limited engineering attempt devoted to harvesting such energy, inducing tremendous energy loss. Here, we present a biomimetic actuator for energy harvesting from exhaust steam. This biomimetic actuator consists of a polyethylene oxide (PEO) layer for hydroscopic actuation and a polyvinylidene fluoride (PVDF) layer for power generation. Such PEO/PVDF actuator sustains reversible two-stage deformation in exhaust steam, delivering a maximum bending angle of 760◦. A 1.5 cm × 3 cm PEO/ PVDF actuator achieves peak voltages of 4, 0.5, 3, and 2 V, respectively, upon exposure to the steam generated from mouth breath, wet paper, hot water, and solar evaporator, suggesting high-potential practical integration. The generated electricity from the actuator can be rectified and stored to operate low-power electronics, such as light-emitting diodes. Our study has paved a way for the future design of advanced actuators pertinent to low-grade energy harvesting for a sustainable society.

Research Areas:

Advanced Materials

Contact for


Dr. L.Z. Xu

+(852) 3917 2628

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