QQ客服 官方微博 反馈留言

	Enhancing thermoelectric performance in hierarchically structured bicuseo by increasing bond covalency and weakening carrier-phonon coupling
	Ren, Guang-Kun1,2; Wang, Shan-Yu2; Zhu, Ying-Cai3; Ventura, Kyle J.4; Tan, Xing1; Xu, Wei3; Lin, Yuan-Hua1; Yang, Jihui2; Nan, Ce-Wen1
刊名	Energy & environmental science
	2017-07-01
卷号	10期号:7页码:1590-1599
ISSN号	1754-5692
DOI	10.1039/c7ee00464h
通讯作者	Lin, yuan-hua() ; Yang, jihui()
英文摘要	Bicuseo oxyselenides are promising thermoelectric materials at intermediate temperatures, primarily due to their ultralow lattice thermal conductivity (kappa(l)) and high seebeck coefficient. the intrinsically low carrier mobility in these materials, normally below similar to 20 cm(2) v-1 s(-1) at 300 k, however, largely limits further improvements of their thermoelectric properties. in this study, by introducing less electronegative te into the conductive cu-se layers, we demonstrate that the enhanced chemical bond covalency results in smaller effective mass and thus improved carrier mobility, through the weakening of carrier-phonon coupling. the improved carrier mobility by te-doping largely retains the electrical conductivity values and thus high power factors even with decreased carrier concentrations. meanwhile, the hierarchical structural features including dual point defects, nanoinclusions, grain boundaries, etc., originating from the nonequilibrium self-propagating high-temperature synthesis (shs) processes, further reduce kappa(l) close to the amorphous limit. ultimately, a maximum zt value of similar to 1.2 at 873 k is achieved in bi0.96pb0.04cuse0.95te0.05o, similar to 35% improvement as compared with that of te-free bi0.96pb0.04cuseo and similar to 2.4 times higher than that of the pristine sample. furthermore, our study elucidates that weakening of carrier-phonon coupling through regulating chemical bonding within the conductive functionalities can be an effective avenue for further improving the thermoelectric performance of bicuseo.
WOS关键词	LATTICE THERMAL-CONDUCTIVITY ; DOPED BICUSEO ; TRANSPORT-PROPERTIES ; RECENT PROGRESS ; OXYSELENIDES ; CRYSTALS ; SYSTEM ; OXIDE ; 1ST-PRINCIPLES ; ENHANCEMENT
WOS研究方向	Chemistry ; Energy & Fuels ; Engineering ; Environmental Sciences & Ecology
WOS类目	Chemistry, Multidisciplinary ; Energy & Fuels ; Engineering, Chemical ; Environmental Sciences
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000405279900007
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2177270
专题	高能物理研究所
通讯作者	Lin, Yuan-Hua; Yang, Jihui
作者单位	1.Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China 2.Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA 3.Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China 4.Univ Florida, Dept Chem & Biomol Engn, Gainesville, FL 32610 USA
推荐引用方式 GB/T 7714	Ren, Guang-Kun,Wang, Shan-Yu,Zhu, Ying-Cai,et al. Enhancing thermoelectric performance in hierarchically structured bicuseo by increasing bond covalency and weakening carrier-phonon coupling[J]. Energy & environmental science,2017,10(7):1590-1599.
APA	Ren, Guang-Kun.,Wang, Shan-Yu.,Zhu, Ying-Cai.,Ventura, Kyle J..,Tan, Xing.,...&Nan, Ce-Wen.(2017).Enhancing thermoelectric performance in hierarchically structured bicuseo by increasing bond covalency and weakening carrier-phonon coupling.Energy & environmental science,10(7),1590-1599.
MLA	Ren, Guang-Kun,et al."Enhancing thermoelectric performance in hierarchically structured bicuseo by increasing bond covalency and weakening carrier-phonon coupling".Energy & environmental science 10.7(2017):1590-1599.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。