Enhanced Thermoelectric Performance and Service Stability of Cu2Se Via Tailoring Chemical Compositions at Multiple Atomic Positions

doi:10.1002/adfm.201908315

	Enhanced Thermoelectric Performance and Service Stability of Cu2Se Via Tailoring Chemical Compositions at Multiple Atomic Positions
	Mao, Tao; Qiu, Pengfei; Du, Xiaolong; Hu, Ping; Zhao, Kunpeng; Xiao, Jie; Shi, Xun; Chen, Lidong
刊名	ADVANCED FUNCTIONAL MATERIALS
	2019-12-31
关键词	Cu2Se liquid-like materials service stability thermoelectric
ISSN号	1616-301X
DOI	10.1002/adfm.201908315
文献子类	Article; Early Access
英文摘要	Liquid-like thermoelectric (TE) materials have the advantages of ultrahigh performance, low cost, and environment friendly, but their stability is greatly limited by the possible Cu/Ag deposition under a large current and/or temperature gradient. The pratical application based on liquid-like TE materials requires both a high TE figure of merit (zT) for high energy conversion efficiency and large critical voltage for good stability, but they are very difficult to be simultaneously achieved in one material. In this work, both the zT and critical voltage are simultaneously optimized in Cu2Se via tailoring chemical compositions at multiple atomic positions, i.e., introducing Cu deficiency at the Cu-sites to lower Cu ion chemical potential and alloying sulfur at the Se-sites to reduce carrier concentrations. A maximum zT of 2.0 at 1000 K has been successfully achieved for Cu1.96Se0.8S0.2, about a 30% improvement over that for Cu2Se. More importantly, Cu1.96Se0.8S0.2 demonstrates a much higher critical voltage than Cu2Se, yielding a greatly enhanced service stability under the conditions with/without a temperature gradient. An Ni/Mo/Cu1.96Se0.8S0.2 TE unileg is successfully fabricated with a stable power output even after 400 thermal cycles between 473 and 873 K. This study greatly accelerates the real application of Cu2Se-based liquid-like materials.
WOS关键词	PHASE-TRANSITION ; PHONON-GLASS ; CONDUCTIVITY ; EFFICIENCY ; FIGURE ; ENERGY ; MERIT ; ZT
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
语种	英语
出版者	WILEY-V C H VERLAG GMBH
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/27471]
专题	中国科学院上海硅酸盐研究所
推荐引用方式 GB/T 7714	Mao, Tao,Qiu, Pengfei,Du, Xiaolong,et al. Enhanced Thermoelectric Performance and Service Stability of Cu2Se Via Tailoring Chemical Compositions at Multiple Atomic Positions[J]. ADVANCED FUNCTIONAL MATERIALS,2019.
APA	Mao, Tao.,Qiu, Pengfei.,Du, Xiaolong.,Hu, Ping.,Zhao, Kunpeng.,...&Chen, Lidong.(2019).Enhanced Thermoelectric Performance and Service Stability of Cu2Se Via Tailoring Chemical Compositions at Multiple Atomic Positions.ADVANCED FUNCTIONAL MATERIALS.
MLA	Mao, Tao,et al."Enhanced Thermoelectric Performance and Service Stability of Cu2Se Via Tailoring Chemical Compositions at Multiple Atomic Positions".ADVANCED FUNCTIONAL MATERIALS (2019).