Skin Thermal Management for Subcutaneous Photoelectric Conversion Reaching 500 mW

Lyu, Sang Woo; He, Yonglin; Li, Xinlei; Wang, Hao‐Yi; Yao, Yuge; Peng, Zhimin; Ding, Yanjun; Wang, Yapei

doi:10.1002/adma.202306903

Advanced Materials

2023

DOI: 10.1002/adma.202306903

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Skin Thermal Management for Subcutaneous Photoelectric Conversion Reaching 500 mW

Sang Woo Lyu

Yonglin He

Xinlei Li

et al.

Abstract: Despite possessing higher tissue transmittance and maximum permissible exposure power density for skins relative to other electromagnetic waves, second near‐infrared light (1000∼1350 nm) is scarcely applicable to subcutaneous photoelectric conversion, owing to the companion of photothermal effect. Here, a skin thermal management is conceived to utmostly utilize the photothermal effect of a photovoltaic cell, which not only improves the photoelectric conversion efficiency but also eliminates the skin hypertherm… Show more

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Cited by 3 publications

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Passive thermal energy storage systems using phase change materials (PCMs) are promising for resolving temporal‐spatial overheating issues from small‐ to large‐scale platforms, yet their poor shape stability due to solid–liquid transition incurs PCM leakage and weak resistance against mechanical disturbance, limiting practical applications. While foam‐stable templates for PCMs have shown complement, they reveal massive leakage and collapse of liquefied PCMs under external loads or impacts. Herein, a multiscale porous architecture consisting of graphene aerogels (GAs) and meta structures enabling robust thermal‐mechanical functionalities of PCMs (3D‐MPGA) toward sustainable phase change thermal energy storage composites is reported. 3D‐printed mechanical metamaterials employing octet‐truss cells provide supportive strength and directionally‐assisted leakage reduction, while GAs serve as porous templates with surface‐interfacial contacts, thereby fixing paraffin wax as PCM inside their nano/micropores. The 3D‐MPGA shows intrinsic thermal characteristics of bulk PCMs, and improved thermal‐mechanical‐chemical stability, confirmed by long‐term heating‐cooling cycle tests over 10 h. Moreover, it exhibits highly reinforced strength (200–5000%) within a low density across ambient and melting temperatures, and maintains original shapes in the liquefied PCMs without severe leakage, against external loads. This work inspires rational strategies for advancing robust thermal‐mechanical functionalities for PCM‐based thermal energy storage systems.

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Wearable electronic devices have emerged as a pivotal technology in healthcare and artificial intelligence robots. Among the materials that are employed in wearable electronic devices, organic thermoelectric materials possess great application potential due to their advantages such as flexibility, easy processing ability, no working noise, being self-powered, applicable in a wide range of scenarios, etc. However, compared with classic conductive materials and inorganic thermoelectric materials, the research on organic thermoelectric materials is still insufficient. In order to improve our understanding of the potential of organic thermoelectric materials in wearable electronic devices, this paper reviews the types of organic thermoelectric materials and composites, their assembly strategies, and their potential applications in wearable electronic devices. This review aims to guide new researchers and offer strategic insights into wearable electronic device development.

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Skin Thermal Management for Subcutaneous Photoelectric Conversion Reaching 500 mW

Cited by 3 publications

References 38 publications

Bioelectronic Implantable Devices for Physiological Signal Recording and Closed‐Loop Neuromodulation

Bioelectronic Implantable Devices for Physiological Signal Recording and Closed‐Loop Neuromodulation

Multiscale Porous Architecture Consisting of Graphene Aerogels and Metastructures Enabling Robust Thermal and Mechanical Functionalities of Phase Change Materials

Organic Thermoelectric Materials for Wearable Electronic Devices

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