材料科学
热电效应
化学稳定性
热稳定性
功勋
电压
铜
热电材料
沉积(地质)
能量转换效率
工作(物理)
分析化学(期刊)
化学工程
光电子学
纳米技术
冶金
热力学
复合材料
热导率
电气工程
物理
工程类
古生物学
化学
生物
色谱法
沉积物
作者
Tianqiao Mao,Pengfei Qiu,Xiaolong Du,Ping Hu,Keli Zhao,Jie Xiao,Xun Shi,Lidong Chen
标识
DOI:10.1002/adfm.201908315
摘要
Abstract 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 Cu 2 Se 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 Cu 1.96 Se 0.8 S 0.2 , about a 30% improvement over that for Cu 2 Se. More importantly, Cu 1.96 Se 0.8 S 0.2 demonstrates a much higher critical voltage than Cu 2 Se, yielding a greatly enhanced service stability under the conditions with/without a temperature gradient. An Ni/Mo/Cu 1.96 Se 0.8 S 0.2 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 Cu 2 Se‐based liquid‐like materials.
科研通智能强力驱动
Strongly Powered by AbleSci AI