The design of effective energy systems is crucial for the development of flexible and wearable electronics. Regarding the direct conversion of heat into electricity, thermoelectrochemical cells (TECs) are particularly suitable for low-grade heat harvesting to enable flexible and wearable applications, despite the fact that the electrolyte leakage and complex packaging issues of conventional liquid-based TECs await to be further addressed. Herein, a quasi-solid-state TEC is assembled using the polyacrylamide/acidified-single-walled carbon nanotube (PAAm/a-SWCNT) composite hydrogel, developed via a facile in situ free-radical polymerization route with tin(IV) chloride/tin(II) chloride (Sn⁴⁺/Sn²⁺) as the redox couple. The as-fabricated TEC with a 0.6 wt% a-SWCNT content presents a large thermoelectrochemical Seebeck coefficient of 1.59 ± 0.07 mV K⁻¹ and exhibits excellent stability in thermoelectrochemical performance against large mechanical stretching and deformation. Owing to this superior stretchability, the as-fabricated TEC is further assembled into an energy-autonomous strain sensor, which shows high sensitivity. The strategy of utilizing a quasi-solid-state TEC for energy-autonomous strain sensing unveils the great potential of heat-to-electricity conversion in flexible and wearable electronics.

中文翻译：

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一种具有高拉伸性的柔性准固态热电化学电池作为能量自主应变传感器

有效能源系统的设计对于柔性和可穿戴电子产品的开发至关重要。在将热量直接转化为电能方面，热电化学电池 (TEC) 特别适用于低等级的热量收集，以实现灵活和可穿戴的应用，尽管传统液体基 TEC 的电解质泄漏和复杂的封装问题有待解决。进一步解决。本文使用聚丙烯酰胺/酸化单壁碳纳米管 (PAAm/a-SWCNT) 复合水凝胶组装准固态 TEC，该水凝胶是通过与氯化锡 ( IV )的简便原位自由基聚合途径开发的/氯化锡( II ) (Sn ⁴⁺ /Sn ²⁺) 作为氧化还原对。制成的具有0.6 wt% a-SWCNT含量的TEC具有1.59±0.07 mV K ^-1的大热电化学塞贝克系数，并且在热电化学性能中表现出优异的稳定性，可抵抗大的机械拉伸和变形。由于这种卓越的拉伸性，制造的 TEC 被进一步组装成一个能量自主的应变传感器，它显示出高灵敏度。利用准固态 TEC 进行能量自主应变传感的策略揭示了热电转换在柔性和可穿戴电子产品中的巨大潜力。