Photo-thermo-electric hydrogel with interlocking photothermal layer and hydrogel for enhancement of thermopower generation

IF 10.7 Q1 CHEMISTRY, PHYSICAL EcoMat Pub Date : 2023-12-10 DOI:10.1002/eom2.12428

Jingjie Shen, Chenhui Yang, Yanli Ma, Mengnan Cao, Zifa Gao, Shuo Wang, Jian Li, Shouxin Liu, Zhijun Chen, Shujun Li

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Abstract

Photothermal devices and thermoelectric cells hold great promise for energy generation but integration of the two remains a considerable challenge in real-life power supply for sensors. Here, a novel photo-thermo-electric hydrogel (PTEH-Interlocking) was constructed by the synthesis of a photothermal layer on a thermoelectric hydrogel with the redox pair Fe(CN)₆³⁻/Fe(CN)₆⁴⁻. The smart design of using the oxidation of pyrogallic acid by Fe(CN)₆³⁻ to construct the photothermal layer for photo-to-heat conversion protected the redox couple of the thermogalvanic ion pair from ultraviolet damage, as well as triggered the formation of an interlocking structure at the interface of the photothermal layer and the thermoelectric hydrogel. The as-prepared PTEH-Interlocking has shown a high Seebeck coefficient and rapid heat transfer, boosting the photo-thermo-electric conversion. As a demonstration of a practical application, the PTEH-Interlocking cells are successfully used as the energy supply for a mechanical sensor.

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具有互锁光热层和水凝胶的光热发电水凝胶，用于提高热发电量

光热器件和热电电池在能源生产方面前景广阔，但在实际传感器供电方面，两者的整合仍是一个相当大的挑战。本文通过在热电水凝胶上合成光热层与氧化还原对 Fe(CN)63-/Fe(CN)64-，构建了一种新型光热电水凝胶（PTEH-Interlocking）。利用 Fe(CN)63- 氧化焦金酸来构建光热层进行光-热转换的巧妙设计保护了热电离子对的氧化还原对免受紫外线的破坏，并在光热层和热电水凝胶的界面上形成了互锁结构。制备的 PTEH-Interlocking 具有较高的塞贝克系数和快速传热的特性，从而促进了光热电转换。在实际应用中，PTEH 互锁电池被成功用作机械传感器的能源供应。

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