Regulating Thermogalvanic Effect and Mechanical Robustness via Redox Ions for Flexible Quasi-Solid-State Thermocells.
Regulating Thermogalvanic Effect and Mechanical Robustness via Redox Ions for Flexible Quasi-Solid-State Thermocells.
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DOI：
10.1007/s40820-022-00824-6
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发表时间：
2022-03-25
影响因子：
26.6
通讯作者：
Chen G
中科院分区：
文献类型：
--
作者：
Peng P;Zhou J;Liang L;Huang X;Lv H;Liu Z;Chen G
采用氧化还原电对实现热电转换和离子交联的双重功能。在优化的氧化还原浓度下可以实现高的热电化学性能，双交联网络确保了卓越的机械灵活性和鲁棒性。基于水凝胶的准固态热电池可以在苛刻的机械应力和变形下提供稳定的能量输出。在线版本包含补充材料，可通过10.1007/s40820-022-00824-6获得。用于可穿戴应用的电源系统的设计需要灵活性和耐用性。具有大塞贝克系数的热电化学电池（TEC）能够有效地将低品位的热量转化为电能，因此近年来受到了广泛的关注。利用水凝胶电解质基本上解决了传统液基TEC中存在的电解质泄漏和复杂的封装问题，这很好地满足了对柔性的需求。然而，确保稳定能量输出的机械鲁棒性问题仍有待解决。本文提出了一种基于水凝胶电解质的合理设计的柔性准固态TEC，其热电效应和机械鲁棒性通过氧化还原对的多价离子同时调节。引入的氧化还原离子不仅赋予水凝胶优异的热电转换能力，而且还作为离子交联提供双重交联结构，导致可逆键用于有效的能量耗散。优化后的TEC具有1.43 mV K−1的高Seebeck系数和3555 J m−2的显著改善的断裂韧性，从而可以在各种苛刻的机械刺激下保持稳定的热电化学性能。这项研究揭示了准固态TEC作为可穿戴应用的灵活耐用的能源供应系统的高潜力。在线版本包含补充材料，可通过10.1007/s40820-022-00824-6获得。
A redox couple is employed to fulfill the dual-function of both heat-to-electricity conversion and ionic crosslinking. High thermoelectrochemical performance can be achieved at optimized redox concentration, and dual-crosslinked network ensures remarkable mechanical flexibility and robustness. The hydrogel-based quasi-solid-state thermocell can provide stable energy output under harsh mechanical stress and deformations. The online version contains supplementary material available at 10.1007/s40820-022-00824-6. The design of power supply systems for wearable applications requires both flexibility and durability. Thermoelectrochemical cells (TECs) with large Seebeck coefficient can efficiently convert low-grade heat into electricity, thus having attracted considerable attention in recent years. Utilizing hydrogel electrolyte essentially addresses the electrolyte leakage and complicated packaging issues existing in conventional liquid-based TECs, which well satisfies the need for flexibility. Whereas, the concern of mechanical robustness to ensure stable energy output remains yet to be addressed. Herein, a flexible quasi-solid-state TEC is proposed based on the rational design of a hydrogel electrolyte, of which the thermogalvanic effect and mechanical robustness are simultaneously regulated via the multivalent ions of a redox couple. The introduced redox ions not only endow the hydrogel with excellent heat-to-electricity conversion capability, but also act as ionic crosslinks to afford a dual-crosslinked structure, resulting in reversible bonds for effective energy dissipation. The optimized TEC exhibits a high Seebeck coefficient of 1.43 mV K−1 and a significantly improved fracture toughness of 3555 J m−2, thereby can maintain a stable thermoelectrochemical performance against various harsh mechanical stimuli. This study reveals the high potential of the quasi-solid-state TEC as a flexible and durable energy supply system for wearable applications. The online version contains supplementary material available at 10.1007/s40820-022-00824-6.
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