Effects of high entropy combined with Cu/Ag doping on the thermoelectric properties of Bi2Sr2Co2Oy ceramics

被引：0
作者：
Xu, Yingying [1 ,2 ,3 ]
Li, Mengyao [1 ,2 ]
Zhang, Yingjiu [1 ,2 ]
Song, Hongzhang [1 ,2 ]
Hao, Haoshan [3 ,4 ]
机构：
[1] Zhengzhou Univ, Sch Phys, Key Lab Mat Phys, Minist Educ, Zhengzhou 450051, Peoples R China
[2] Zhengzhou Univ, Lab Zhongyuan Light, Zhengzhou 450001, Peoples R China
[3] Henan Univ Engn, Key Lab Elect Ceram Mat & Applicat Henan Prov, Xinzheng 451191, Peoples R China
[4] Nanyang Inst Technol, Nanyang 473004, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2025年 / 51卷 / 09期
基金：
中国博士后科学基金;
关键词：
Bi 2 Sr 2 Co 2 O y; Thermoelectric properties; High entropy doping; Accepter doping; rho kappa; THERMAL-CONDUCTIVITY; CHARGE-TRANSPORT; OXIDES; POWER;
D O I：
暂无
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A series of Bi2Sr2Co2Oy (BSCO), Bi2(Sr2/3Ba2/3Ca2/3)Co2Oy (BSBCCO), Bi1.9Cu0.1(Sr2/3Ba2/3Ca2/3)Co2O (BCSBCCO) and Bi1.8Ag0.2(Sr2/3Ba2/3Ca2/3)Co2Oy (BASBCCO) ceramic samples were prepared to optimize the thermoelectric properties of BSCO by high entropy doping combined with Cu/Ag doping. High entropy doping improves the carrier mobility significantly, due to a sintering effect in liquid phase and an additional conduction path. Cu/Ag acceptor doping increases the carrier concentration and Seebeck coefficients. Both them enhance the electrical transport performance of doped samples effectively. Specially, the random distribution of several different cations caused by high entropy doping and Cu/Ag doping can enhance the phonon scattering, which greatly reduces the thermal conductivity of doped samples. Finally, the thermoelectric figure of merit (ZT) value of the BASBCCO sample is improved to 0.36 at 923 K on the basis of high entropy doped BSBCCO (ZT = 0.28 923 K), which is twice that of the pristine sample.
引用
收藏
页码：11378 / 11386
页数：9
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