Improved thermoelectric performance of BiCuSeO by Ag substitution at Cu site

被引：42
作者：
Farooq, M. U. [1 ,2 ]
Butt, Sajid [3 ,4 ]
Gao, Kewei [1 ]
Pang, Xiao L. [1 ]
Sun, Xigui [1 ]
Asfandiyar [4 ]
Mohmed, Fida [4 ]
Ahmad, Abida [4 ]
Mahmood, Asif [5 ]
Mahmood, Nasir [6 ,7 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Xinjiang Inspect Inst Special Equipment, Urumqi 830011, Peoples R China
[3] Inst Space Technol, Dept Mat Sci & Engn, Islamabad 44000, Pakistan
[4] Tsinghua Univ, State Key Lab New Ceram & Fine Proc, Sch Mat Sci & Engn, Beijing 100084, Peoples R China
[5] Peking Univ, Dept Mat Sci & Engn, Coll Engn, Beijing 100871, Peoples R China
[6] Univ Wollongong, Inst Supercond & Elect Mat, Australian Inst Innovat Mat, Squaires Way, North Wollongong, NSW 2500, Australia
[7] Univ Elect Sci & Technol China, Ctr Micronano Funct Mat & Devices CMD, Sch Energy Sci & Engn, Chengdu 611731, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 691卷
关键词：
BiCu1-xAgxSeO; Cu-site; Thermal conductivity; Thermoelectric materials; ZT; DOPED BICUSEO; THERMAL-CONDUCTIVITY; BULK THERMOELECTRICS; TRANSPORT-PROPERTIES; OXYSELENIDES; CONVERGENCE; CERAMICS; BA;
D O I：
10.1016/j.jallcom.2016.08.236
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
BiCuSeO oxyselenide-based thermoelectric materials are attracting much attention due to their ultra-low intrinsic thermal conductivity (k) and moderate Seebeck coefficient (S). However, the low conversion efficiency limits their application in energy conversion systems. This paper investigated the effect of monovalent Ag-doping in BiCuSeO at Cu site in the presence of polyvinyl alcohol (PVA). The results show that Ag is effectively doped at Cu site. The heavy atom substitution in BiCu1-xAgxSeO at Cu site can enhance S and reduce its total thermal conductivity (k) by phonon scattering. Further, the incorporation of heavy atom (Ag) with different ionic radii results in the improved ZT of 0.64 for BiCu1-xAgxSeO, which is 16% more than that for pure BiCuSeO (ZT = 0.55) at 923 K. It is believed that the Cu site should be an efficient dopant site to improve the efficiency of oxyselenide-based thermoelectric materials. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：572 / 577
页数：6
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