Enhanced asymmetrical transport of carriers induced by local structural distortion in chemically tuned titania: A possible mechanism for enhancing thermoelectric properties
文献类型：期刊论文
| 作者 | Liu, C.1,2; Miao, L.1 ; Hu, D.3; Huang, R.4; Fisher, C. A. J.5; Tanemura, S.1,5,6; Gu, H.3
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| 刊名 | physical review b
 |
| 出版日期 | 2013-11-07 |
| 卷号 | 88期号:20 |
| 英文摘要 | optimizing all three thermoelectric properties (seebeck coefficient, electrical conductivity, and thermal conductivity) simultaneously is a nontrivial task, especially for the seebeck coefficient and electrical conductivity. here, we demonstrate that chemically tuned rutile tio2 sintered from n- and nb-codoped nanoparticles possesses not only an enhanced power factor but also a decreased thermal conductivity. in samples produced under strongly reducing conditions, the electrical resistivity is decreased markedly to 3.96 x 10(-5) omega m while maintaining a high seebeck coefficient. in this manner, the power factor can be greatly improved to 9.87 x 10(-4) w m(-1) k-2 at 785 degrees c with a significantly enhanced figure of merit zt of 0.35 at 700 degrees c. theoretical modeling based on density functional theory suggests that enhanced asymmetrical carrier transport (i.e., with the minority carrier relatively localized on one side of the fermi level but the majority carrier delocalized on the other) can be induced by locally distorting the crystal structure, since this imposes local perturbations on the intrinsic periodic potential field, which may be responsible for the improved power factor. the greatly improved thermoelectric behavior of chemically tuned rutile tio2 provides a promising route to producing practical thermoelectric materials without the use of toxic heavy elements. our findings also provide a promising new strategy for enhancing the thermoelectric properties of other thermoelectric materials. |
| WOS标题词 | science & technology ; physical sciences |
| 类目[WOS] | physics, condensed matter |
| 研究领域[WOS] | physics |
| 关键词[WOS] | thermal-conductivity ; rutile tio2 ; electronic-structure ; anatase tio2 ; performance ; dioxide ; oxides ; merit ; metal ; power |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000326821200001 |
| 源URL | [http://ir.giec.ac.cn/handle/344007/9088]  |
| 专题 | 中国科学院广州能源研究所 太阳能系统应用实验室 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Renewable Energy, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, State Key Lab High Performance Ceram & Superfine, Shanghai Inst Ceram, Shanghai 200050, Peoples R China 4.E China Normal Univ, Key Lab Polarized Mat & Devices, Minist Educ, Shanghai 200062, Peoples R China 5.Japan Fine Ceram Ctr, Atsuta Ku, Nagoya, Aichi 4568587, Japan 6.Nagoya Inst Technol, Powder Technol Project Lab, Showa Ku, Nagoya, Aichi 4668555, Japan |
| 推荐引用方式 GB/T 7714 | Liu, C.,Miao, L.,Hu, D.,et al. Enhanced asymmetrical transport of carriers induced by local structural distortion in chemically tuned titania: A possible mechanism for enhancing thermoelectric properties[J]. physical review b,2013,88(20). |
| APA | Liu, C..,Miao, L..,Hu, D..,Huang, R..,Fisher, C. A. J..,...&Gu, H..(2013).Enhanced asymmetrical transport of carriers induced by local structural distortion in chemically tuned titania: A possible mechanism for enhancing thermoelectric properties.physical review b,88(20). |
| MLA | Liu, C.,et al."Enhanced asymmetrical transport of carriers induced by local structural distortion in chemically tuned titania: A possible mechanism for enhancing thermoelectric properties".physical review b 88.20(2013). |
入库方式： OAI收割
来源：广州能源研究所
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