Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 33, Pages 39541-39549Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c13050
Keywords
thermoelectric; copper sulfide; solvothermal method; phase tuning; copper vacancy
Funding
- National Natural Science Foundation of China [51802034, 11674040, 51672270]
- Fundamental Research Funds for the Central Universities [2019CDQYCL003]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2018jcyjAX0346]
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University
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A series of Cu2-xS materials were synthesized by changing the CuCl/Na2S molar ratio, leading to improvements in electrical properties with the 1.75:1 molar ratio sample achieving a good power factor at 815K.
Cu2S, consisting of Earth-abundant and eco-friendly elements, is a promising candidate for thermoelectric energy conversion. The stoichiometric Cu2S has intrinsically low thermal conductivity together with meagre electrical conductivity. Herein, in order to improve the electrical properties, we develop a facile solvothermal method for synthesizing a series of Cu2-xS with tunable phase compositions. With reduction in the CuCl/Na2S molar ratio in the solution precursors from 2:1 to 1.75:1, the solvothermal products transform from single-phase Cu2S into Cu2S-Cu1.96S composites, which are preserved in the hot-pressed pellets. The decreased CuCl/Na2S molar ratio results in increased room-temperature Hall carrier concentration, leading to enhanced electrical conductivity. Specifically, the pellet corresponding to the 1.75:1 CuCl/Na2S precursor ratio obtains a power factor of 8.04 mu W cm(-1) K-2 at 815 K, which is similar to 735% of the value obtained by stoichiometric Cu2S. Along with the moderate thermal conductivity, this sample achieves an enhanced zT value of 0.87 at 815 K, representing a similar to 250% increase when compared to stoichiometric Cu2S. This study demonstrates an effective strategy in enhancing the thermoelectric performance of solution-synthesized Cu2S-based materials by phase tuning.
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