Eye Tear Activated Mg‐Air Battery Driven by Natural Eye Blinking for Smart Contact Lenses

A sliding electrolyte metal-air microbattery driven by natural eye blinking motion is demonstrated as a source of electrical energy that can be integrated with smart contact lens platforms. The battery (footprint 10 mm2) consists Mg anode and Pt cathode, patterned on an insulating substrate the film eye-tear fluid periodically dragged top electrodes during eye-blinking cycle, which activates battery. When tested emulator, open-circuit voltage across activated (ETMAB) 2.2 V. Impedance matching analysis reveals maximum battery-specific capacity 3561 mAh g–1 obtained at discharge current density 5 mA cm–2. exhibits generated power 1.3 mW cm–2 load 740 Ω. ETMAB delivers eight times higher output more than three longer lifetime achievable static designs.