Wireless Power Transfer Systems: Multifunctional High‐Power Sources for Smart Contact Lenses (Adv. Funct. Mater. 29/2020)

Takamatsu, Taiki; Yin, Shougen; Shujie, Fang; Liu, Xiaohan; Miyake, Takeo

doi:10.1002/adfm.202070191

Cited by 4 publications

(2 citation statements)

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“…For example, Chu et al [9] developed a smart contact lens for glucose detection and successfully tested it on a rabbit's eye but the device required a wired connection to an external power source, which is not a practical approach to commercialize a wearable and mobile electronic device. Electrical power can also be delivered [2,[10][11][12][13][14][15][16] to ocular devices wirelessly in a less obstructive manner. Wireless power transfer requires both an external transmitter antenna and an on-theeye coil.…”

Section: Introductionmentioning

confidence: 99%

Power Scavenging Microsystem for Smart Contact Lenses

Pourshaban,

Karkhanis,

Deshpande

et al. 2024

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On‐the‐eye microsystems such as smart contacts for vision correction, health monitoring, drug delivery, and displaying information represent a new emerging class of low‐profile (≤ 1 mm) wireless microsystems that conform to the curvature of the eyeball surface. The implementation of suitable low‐profile power sources for eye‐based microsystems on curved substrates is a major technical challenge addressed in this paper. The fabrication and characterization of a hybrid energy generation unit composed of a flexible silicon solar cell and eye‐blinking activated Mg–O2 metal–air harvester capable of sustainably supplying electrical power to smart ocular devices are reported. The encapsulated photovoltaic device provides a DC output with a power density of 42.4 µW cm−2 and 2.5 mW cm−2 under indoor and outdoor lighting conditions, respectively. The eye‐blinking activated Mg–air harvester delivers pulsed power output with a maximum power density of 1.3 mW cm−2. A power management circuit with an integrated 11 mF supercapacitor is used to convert the harvesters’ pulsed voltages to DC, boost up the voltages, and continuously deliver ≈150 µW at a stable 3.3 V DC output. Uniquely, in contrast to wireless power transfer, the power pack continuously generates electric power and does not require any type of external accessories for operation.

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Section: Introductionmentioning

confidence: 99%

Power Scavenging Microsystem for Smart Contact Lenses

Pourshaban,

Karkhanis,

Deshpande

et al. 2024

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“…[ 8–10 ] Biofuel cell (BFC) is recognized to generate electricity using enzymes as bioelectrocatalysis. [ 11–15 ] It can convert chemical energy into electrical energy by oxidizing and reducing biofuels in body fluids, which are expected to continuously harvest energy from living organisms and be considered as a promising implantable power device. [ 16,17 ]…”

Section: Introductionmentioning

confidence: 99%

Designing Porous Antifouling Interfaces for High‐Power Implantable Biofuel Cell

Wang

Gao

et al. 2021

Adv Funct Materials

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Biofuel cells that can convert the chemical energy of biomass such as glucose into electricity are expected to continuously obtain energy from living organisms and solve bottlenecks of energy supply for implanted electronics. However, the use of biofuel cells is limited mainly by the sharp drop in performance after implanting in living organisms caused by biofouling and electrode surface inactivation. Herein, a simple and effective strategy to overcome these problems by designing a porous antifouling interface on biofuel cells, is demonstrated. It resists the biofouling from body fluid while sustaining reactant penetration, and also enhances immobilization of enzymes. As a result, the biofuel cell can maintain almost 100% performance after implanting in living organisms, and a maximal output power of 76.6 mW cm‐3 is achieved in vivo, which is ≈96 times of the highest performance reported to date. This strategy is universal and can be extended to the other electronic devices such as electrochemical sensors, which presents a new avenue for developing high‐performance implanted electronics.

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