Materials Today Energy
·
2023
·
IF 9.3
Weihua Wang,Quanlin Wang,Lin Sun,Peng Jiang,Xinhe Bao
High-performance thermoelectric (TE) devices are promising for waste-heat recovery and power generation. Recently, Sb 2 Si 2 Te 6 has been demonstrated as a promising p-type TE material with high performance and low cost. However, Sb 2 Si 2 Te 6 -based TE devices have not yet been fabricated. The performance of TE devices depends on not only TE materials, but also electrode materials and inner interfaces. Herein, we utilize the high throughput strategy to screen the appropriate electrode material and find that cobalt exhibits a low contact resistance (2.47 μΩ cm −2 ) and a high shear strength (18.03 MPa). Furthermore, we successfully fabricate one eight-couple Sb 2 Si 1.99 Ge 0.01 Te 6 (p-type)/Yb 0.3 Co 4 Sb 12 (n-type) TE module with optimized geometric parameters by the finite element method . The module exhibits a high output power density (0.92 W cm −2 ) and a decent energy conversion efficiency (4.2%) under a temperature difference of 500 K. Our studies will promote further development of Sb 2 Si 2 Te 6 materials and Sb 2 Si 2 Te 6 -based devices.
研究领域:
材料科学
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热电学
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能源工程
✓ 已验证
DOI
高影响因子
SCRIPTA MATERIALIA
·
2024
·
IF 5.3
Chengjun Li,Yubo Luo,Wang Li,Linhan Yang,Wenyuan Ma,Zheng Ma,Chengwei Sun,Boyu Yang,Yingchao Wei,Xin Li,Junyou Yang
We report here a high thermoelectric performance in magnesium (Mg) doped Sb 2 Si 2 Te 6 . The substitution of Mg 2+ for Sb 3+ in Sb 2 Si 2 Te 6 induces a synergetic effect on electrical transport performance, exciting multi-band carrier transport behavior, enhancing carrier concentration, and increasing the density of states effective mass. Such effects lead to the highest power factor of 10.95 μW cm −1 K −2 at 824 K for the Sb 1.99 Mg 0.01 Si 2 Te 6 , representing a ∼22 % increase compared to pristine Sb 2 Si 2 Te 6 . In addition, Mg doping induces Mg Sb − point defects phonon scattering, resulting in a low thermal conductivity of ∼0.52 W m −1 K −1 at 824 K. The simultaneous optimization of the power factor and thermal conductivity in Sb 1.99 Mg 0.01 Si 2 Te 6 leads to a peak ZT of ∼1.15 at 824 K and an average ZT of ∼0.68 (400−824 K), showing its potential for power generator at medium temperature.
研究领域:
材料科学
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热电学
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固体物理学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 38
·20489-20496
·
IF 14.511
Weihua Wang,Xiaowei Lu,Lin Sun,Jipeng Luo,Quan Shi,Na Ta,Peng Jiang,Xinhe Bao
Thermoelectric materials, which can directly convert thermal energy into electricity, play an important role in waste heat recovery. Sb2Si2Te6 is a promising medium-temperature thermoelectric material for power generation. However, its application is restricted by the relatively low power factor (PF) and the decompostion at high temperature. Herein, we successfully improved the power factor of Sb2Si2Te6 by doping with germanium (Ge). Benefiting from the optimized carrier concentration, the power factor of Sb2Si1−xGexTe6 remains higher than 1100 μW m−1 K−2 from 473 K to 773 K and the highest zT value reaches 1.0 at 773 K. Furthermore, the power generation performance of a single-pair thermoelectric module, consisting of Sb2Si1.94Ge0.06Te6 and Mg3.2Sb1.5Bi0.49Te0.01, is evaluated by three-dimensional numerical simulation. The simulated conversion efficiency is as high as 13% at a temperature difference of 500 K, and the power density can reach up to 3 W cm−2. Our results demonstrate that Ge doping can effectively modify the thermoelectric properties of Sb2Si2Te6 and improve its power generation performance, paving the way for realistic applications in the medium-temperature region.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Tian Xu,Abubakar-Yakubu Haruna,Zheng Ma,Wang Li,Jinmeng Li,Yubo Luo,Dan Zhang,Junyou Yang
We report here a high thermoelectric performance in cadmium doped Sb2Si2Te6. The substitution of Ca2+ for Sb3+ provides a synergetic effect on the electrical transport properties, including hole concentration enhancement, valence band maximum flatting, band gap increase, and density of states effective mass enhancement in Sb2Si2Te6. Such effect leads to the highest power factor of 13.5 μW m–1 K–2 at 573 K and average power factor of 12.6 μW m–1 K–2 for Sb1.97Ca0.03Si2Te6. Such enhanced power factor and average power factor are ∼30% and ∼26% higher than that of pristine Sb2Si2Te6 respectively, which is very necessary for the output power optimization of Sb2Si2Te6. In addition, Ca doping also induces extra point defects phonon scattering, leading to a lowest lattice thermal conductivity of ∼0.41 W m–1 K–1 at 823 K for Sb1.99Ca0.01Si2Te6, ∼15% lower than that of pristine Sb2Si2Te6. The simultaneous optimization in power factor and lattice thermal conductivity enables us to achieve a high peak thermoelectric figure of merit ZT of ∼1.3 at 823 K and a high average ZT of ∼0.8 for Sb1.99Ca0.01Si2Te6, showing its potential for power generator at medium temperature.
研究领域:
材料科学
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热电材料
·
能量转换
✓ 已验证
DOI
高影响因子
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