Zinc ion thermoelectrochemical cells (ZTECs) have emerged as one of the attractive candidates for low-grade heat harvesting and energy storage but are greatly limited by the lack of promising cathode materials with superior rate capability and good durability. Here, we propose a facile strategy for the microstructural engineering of hydrate vanadium oxide by a surfactant to overcome such barriers. Impressively, a large Seebeck coefficient of 6.4 mV K⁻¹, remarkable thermal-induced power density of 1.8 W m⁻², and high durability were achieved by optimizing the cathode together with superior energy storage behaviors. Besides, one solid-state ZTEC could achieve a high output voltage of ∼0.83 V and power density of 0.2 W m⁻² with an ultralow temperature difference of 5 K. All the findings demonstrate the promising potential of microstructural engineering for electrode materials in the construction of high-performance thermoelectrochemical devices.

中文翻译：

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用于增强锌离子热电化学电池的水合五氧化二钒微结构工程

锌离子热电化学电池 (ZTEC) 已成为低品位热收集和储能的有吸引力的候选者之一，但由于缺乏具有优异倍率性能和良好耐久性的有前途的正极材料而受到极大限制。在这里，我们提出了一种通过表面活性剂对水合氧化钒进行微结构工程的简便策略，以克服这些障碍。令人印象深刻的是，通过优化阴极和卓越的储能行为，实现了6.4 mV K ^-1的大塞贝克系数、 1.8 W m ^-2的显着热致功率密度和高耐久性。此外，一种固态ZTEC可以实现~0.83 V的高输出电压和0.2 W m ^{-2的功率密度}具有 5 K 的超低温差。所有研究结果都证明了电极材料的微结构工程在构建高性能热电化学装置方面的巨大潜力。