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| 1 | 铜基硫族化合物热电材料(英文)显示文摘铜基硫族化合物因其高性能、可调的输运性质、高丰度和低毒性,被认为是很有前景的新型热电材料,引起了研究者的广泛关注.本文总结了近年来铜基热电材料的研究进展,包括类金刚石结构材料、声子液体二元及多元化合物等.本文首先总体介绍了两套亚晶格的基本特征及其对热学、电学性质的影响:一方面,复杂晶体结构和无序、甚至液态化的亚晶格导致极低的热导率;另一方面,刚性亚晶格构成电荷传输通道,保证了较高的电学性能.然后,本文针对特定的几类材料体系,详细介绍了其典型结构特征与'结构-性能'构效关系,以及掺杂、固溶、能带结构调控和纳米结构设计等多尺度优化手段.最后,本文从材料研发和器件研制的角度评述了铜基硫族化合物作为热电材料的应用前景及相关进展. | 魏天然 覃玉婷 邓婷婷 宋庆峰 江彬彬 刘睿恒 仇鹏飞 史迅 陈立东 | 2019 | Science China Materials2019，62，1： | 4 |
| 2 | Si添加物对Li掺杂的Mg_2(Ge,Sn)热电性能的影响显示文摘Mg_2(Ge,Sn)固溶体是一种环境友好型的中温(500~800 K)热电材料。目前n型Mg_2(Ge,Sn)热电材料的ZT值已经高达1. 4,但p型Mg_2(Ge,Sn)的ZT值仅为0. 5。本文在p型Mg1. 92Li0. 08Ge0. 4Sn0. 6中添加了少量Si元素以在材料中形成富Si相,利用其与基体的界面过滤低能载流子、降低热导率。采用两步固相反应、球磨和热压的方法制备Mg_(1.92)Li_(0.08)Ge_(0.4)Sn_(0.6-x)Si_x(x=0,0. 025,0. 05,0. 075,0. 1)样品,通过测试样品的热电输运参数,分析Si添加物对样品热电输运和性能的影响。结果表明:Si添加物能显著提高基体的功率因子,同时有效降低晶格热导率和电子热导率;最终,Mg1. 92Li0. 08Ge0. 4Sn0. 525Si0. 075的ZT最大值在723 K达到0. 75。 | 张勤勇 袁国才 王俊臣 毛俊西 雷晓波 | 2018 | 西华大学学报(自然科学版)2018，37，5： | 3 |
| 3 | Synthesis and thermoelectric properties of Rashba semiconductor BiTeBr with intensive texture显示文摘Bismuth tellurohalides with Rashba-type spin splitting exhibit unique Fermi surface topology and are developed as promising thermoelectric materials. However,BiTeBr, which belongs to this class of materials, is rarely investigated in terms of the thermoelectric transport properties. In the study, polycrystalline bulk BiTeBr with intensive texture was synthesized via spark plasma sintering(SPS). Additionally, its thermoelectric properties above room temperature were investigated along both the inplane and out-plane directions, and they exhibit strong anisotropy. Low sound velocity along two directions is found and contributes to its low lattice thermal conductivity. Polycrystalline BiTeBr exhibits relatively good thermoelectric performance along the in-plane direction,with a maximum dimensionless figure of merit(ZT) of 0.35 at 560 K. Further enhancements of ZT are expected by utilizing systematic optimization strategies. | Jia-Zhan Xin Chen-Guang Fu Wu-Jun Shi Guo-Wei Li Gudrun Auffermann Yan-Peng Qi Tie-Jun Zhu Xin-Bing Zhao Claudia Felser | 2018 | Rare Metals2018，37，4： | 2 |
| 4 | Intermetallic ferric nickel silicide alloy derived from magadiite by magnesiothermic reaction as bifunctional electrocatalyst for overall water splitting显示文摘As the cleanest energy source,hydrogen energy is regarded as the most promising fuel.Water electrolysis,as the primary means of hydrogen production,has constantly been the focus of attention in the energy conversion field.Developing eco-friendly,cheap,safe and efficient catalysts for electrochemical water splitting(EWS)is the key challenge.Herein,the intermetallic silicide alloy is first synthesized via a facile magnesiothermic reduction and employed as bifunctional electrocatalysts for EWS.Ferric-nickel silicide(denoted as FeNiSi)alloy is designed and shows a good electrocatalytic performance for EWS.The lattice distortions of FeNiSi enhance the electrocatalytic activity.Besides,the porous structure affords more active sites and improves the reaction kinetics.As a consequence,FeNiSi delivers an excellent performance with overpotential of 308 mV for oxygen evolution reaction(OER)and 386 mV for hydrogen evolution reaction(HER)at 10 mA·cm−2 in 1 M KOH.The stability structure of intermetallic silicide achieves an outstanding durability with an unchanged potential of 1.66 V for overall water splitting at 10 mA·cm−2 for 15 h.This work not only provides a facile method for the synthesis of intermetallic silicide with considerable porous structures,but also develops the potential of intermetallic silicide alloy as bifunctional electrocatalysts for EWS,which opens up a new avenue for the design and application of intermetallic silicide alloy. | Xuyang Jing Yang Mu Zhanming Gao Xueying Dong Changgong Meng Chi Huang Yifu Zhang | 2024 | Nano Research Energy2024，3，2： | 0 |
| 5 | α⁃Cu_(2)Se的显微缺陷结构显示文摘本文利用球差校正电镜对Cu_(2)Se低温α相的显微缺陷结构进行精细表征。α⁃Cu_(2)Se呈层状特征,其中Se构成了刚性亚晶格,Cu离子有序填充于{111}c晶面之间形成了交替分布的富Cu层和贫Cu层。层间滑移是导致超结构出现的主要原因。在Cu_(2)Se从高温β相到低温α相的结构转变过程中,由于对称性破缺和Se刚性亚晶格的保留,Cu离子在不同区域的有序性差异使得α⁃Cu_(2)Se中存在大量共格连接的畴结构。实验结果有助于更全面地理解α⁃Cu_(2)Se的显微缺陷结构。 | 王正洲 白辉 吴劲松 | 2023 | 电子显微学报2023，42，4： | 0 |
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