{"title":"以 TiO2-n 纳米团簇为介质的 Cu2Se 基热电材料的超低热导率和高 ZT","authors":"","doi":"10.1016/j.joule.2024.06.007","DOIUrl":null,"url":null,"abstract":"<div><p>Cu<sub>2</sub><span><span><span>Se is a promising p-type thermoelectric material for energy harvesting due to its intrinsically low </span>thermal conductivity arising from the liquid-like </span>Cu ions, leaving very limited room for regulation of phonon propagation. Herein, the thermal conductivity of superionic Cu</span><sub>2</sub><span>Se is efficiently mediated by titanium oxide nanoclusters, leading to an exceptionally high thermoelectric figure of merit (</span><em>ZT</em>) at high temperatures. By controlling the oxygen deficiency, the sophisticated TiO<sub>2−n</sub> architectures can be constructed with optimized phase composition and electrical properties. The presence of p-n junctions helps to reduce carrier concentration without degrading mobility, and the complex heterogeneous interfaces generated by TiO<sub>2−n</sub> nanoclusters give rise to huge interfacial thermal resistance. Benefiting from the suppressed electrical transport and enhanced phonon scattering, the total thermal conductivity shows a reduction of at least 36%, contributing to a high <em>ZT</em> value of 2.8 at 973 K. This work demonstrates a paradigm of modulating thermal transport through the self-assembly design.</p></div>","PeriodicalId":343,"journal":{"name":"Joule","volume":"8 9","pages":"Pages 2652-2666"},"PeriodicalIF":38.6000,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Ultralow thermal conductivity and high ZT of Cu2Se-based thermoelectric materials mediated by TiO2−n nanoclusters\",\"authors\":\"\",\"doi\":\"10.1016/j.joule.2024.06.007\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Cu<sub>2</sub><span><span><span>Se is a promising p-type thermoelectric material for energy harvesting due to its intrinsically low </span>thermal conductivity arising from the liquid-like </span>Cu ions, leaving very limited room for regulation of phonon propagation. Herein, the thermal conductivity of superionic Cu</span><sub>2</sub><span>Se is efficiently mediated by titanium oxide nanoclusters, leading to an exceptionally high thermoelectric figure of merit (</span><em>ZT</em>) at high temperatures. By controlling the oxygen deficiency, the sophisticated TiO<sub>2−n</sub> architectures can be constructed with optimized phase composition and electrical properties. The presence of p-n junctions helps to reduce carrier concentration without degrading mobility, and the complex heterogeneous interfaces generated by TiO<sub>2−n</sub> nanoclusters give rise to huge interfacial thermal resistance. Benefiting from the suppressed electrical transport and enhanced phonon scattering, the total thermal conductivity shows a reduction of at least 36%, contributing to a high <em>ZT</em> value of 2.8 at 973 K. This work demonstrates a paradigm of modulating thermal transport through the self-assembly design.</p></div>\",\"PeriodicalId\":343,\"journal\":{\"name\":\"Joule\",\"volume\":\"8 9\",\"pages\":\"Pages 2652-2666\"},\"PeriodicalIF\":38.6000,\"publicationDate\":\"2024-09-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Joule\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2542435124002551\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Joule","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2542435124002551","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
摘要
Cu2Se 是一种用于能量收集的前景广阔的 p 型热电材料,这是因为液态 Cu 离子具有固有的低热导率,使得声子传播的调节空间非常有限。在这里,超离子 Cu2Se 的热导率由氧化钛纳米团簇有效调解,从而在高温下实现了极高的热电功勋值 (ZT)。通过控制缺氧,可以构建具有优化相组成和电性能的复杂 TiO2-n 结构。p-n 结的存在有助于在不降低迁移率的情况下降低载流子浓度,而 TiO2-n 纳米团簇产生的复杂异质界面则会产生巨大的界面热阻。得益于被抑制的电传输和增强的声子散射,总热导率降低了至少 36%,从而在 973 K 时实现了 2.8 的高 ZT 值。
Ultralow thermal conductivity and high ZT of Cu2Se-based thermoelectric materials mediated by TiO2−n nanoclusters
Cu2Se is a promising p-type thermoelectric material for energy harvesting due to its intrinsically low thermal conductivity arising from the liquid-like Cu ions, leaving very limited room for regulation of phonon propagation. Herein, the thermal conductivity of superionic Cu2Se is efficiently mediated by titanium oxide nanoclusters, leading to an exceptionally high thermoelectric figure of merit (ZT) at high temperatures. By controlling the oxygen deficiency, the sophisticated TiO2−n architectures can be constructed with optimized phase composition and electrical properties. The presence of p-n junctions helps to reduce carrier concentration without degrading mobility, and the complex heterogeneous interfaces generated by TiO2−n nanoclusters give rise to huge interfacial thermal resistance. Benefiting from the suppressed electrical transport and enhanced phonon scattering, the total thermal conductivity shows a reduction of at least 36%, contributing to a high ZT value of 2.8 at 973 K. This work demonstrates a paradigm of modulating thermal transport through the self-assembly design.
期刊介绍:
Joule is a sister journal to Cell that focuses on research, analysis, and ideas related to sustainable energy. It aims to address the global challenge of the need for more sustainable energy solutions. Joule is a forward-looking journal that bridges disciplines and scales of energy research. It connects researchers and analysts working on scientific, technical, economic, policy, and social challenges related to sustainable energy. The journal covers a wide range of energy research, from fundamental laboratory studies on energy conversion and storage to global-level analysis. Joule aims to highlight and amplify the implications, challenges, and opportunities of novel energy research for different groups in the field.