Energy harvesters are traditionally heavy and create burden in the energy capture process. This smart materials-based energy harvester enables wearable electronic devices. Made with a lightweight macro-fibre composite, it captures energy from motion of the human knee, deforming piezoelectric transducers to generate electricity. Walking 10,000 steps at normal speed is enough to power a smart wristband for the whole day.

• Light (307g only) and easy to wear/take off

• No extra metabolic burden to users

• Can power wearables especially for hikers, e.g. pedometers, health monitors, GPS

• Can be embedded into garments for sportswear

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過往在人體動能發電時需要使用笨重、累贅的電力採集系統，而本項目利用壓電纖維為材料，研發出輕便的可穿戴型電力採集裝置。人體膝蓋於步行時會自然彎曲及伸直，壓電纖維在折合和彎曲的過程中會透過壓電換能器將動能轉化成電能。以正常速度步行10,000步便足以為智能手環提供整天的電力。

• 輕量 (只有307克)及易於穿戴和脫下

• 不會造成額外體力負擔

• 特別適合配備穿戴型電子產品的遠足人士，如計步器、健康監測儀和全球定位系統（GPS）等

• 可應用於運動服裝上