Simultaneously Modulating Solvation and Water Structure for High-Performance Antifreezing n-Type Liquid Thermocells

IF 9.6 1区化学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Materials Letters Pub Date : 2025-03-03 DOI:10.1021/acsmaterialslett.4c0219310.1021/acsmaterialslett.4c02193

Qiangqiang Huang, Yuchi Chen, Congliang Huang, Ronggui Yang* and Xin Qian*,

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Abstract

Emerging ionic thermoelectric (i-TE) modules consisting of p–n liquid thermocell arrays provide compact and cost-effective ways to achieve low-grade heat harvesting. Despite exciting progress in p-type thermocells, high-performance n-type thermocells remain underdeveloped. Here we present an n-type liquid thermocell with a cosolvent antifreezing electrolyte showing enhanced thermopower, record-high efficiency and power density, and the capability to harness both low-grade heat and subfreezing coldness. Acetonitrile is used as the cosolvent molecule with water that can selectively pair with the reduced metal ion only and simultaneously disrupts the water structure. By tailoring these molecular interactions, we achieved a record-high Carnot-relative efficiency of 1.9% among reported n-type thermocells, and a power density of 5.5 W/m² at the hot/cold temperatures of 69.8 °C and −19.5 °C, respectively. Our work marks an important advancement in i-TE technology in terms of both molecular insights and the preparation of high-performance n-type liquid thermocells for low-grade heat harvesting.

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同时调节高性能防冻n型液体热电池的溶剂化和水结构

新兴的离子热电（i-TE）模块由p-n液体热电池阵列组成，提供了紧凑且经济高效的方法来实现低等级的热量收集。尽管p型热电池取得了令人兴奋的进展，但高性能的n型热电池仍然不发达。在这里，我们提出了一种具有共溶剂防冻电解质的n型液体热电池，具有增强的热功率，创纪录的高效率和功率密度，以及利用低低温和亚低温的能力。乙腈作为水的共溶剂分子，只能选择性地与还原金属离子配对，同时破坏水的结构。通过调整这些分子相互作用，我们在已有报道的n型热电池中获得了1.9%的卡诺相对效率，在69.8°C和- 19.5°C的热/冷温度下分别获得了5.5 W/m2的功率密度。我们的工作标志着i-TE技术在分子洞察力和制备用于低等级热收集的高性能n型液体热电池方面取得了重要进展。

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来源期刊

ACS Materials Letters MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

14.60

自引率

3.50%

发文量

261

期刊介绍： ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.