Chemical Tuning of TiO2 Nanoparticles and Sintered Compacts for Enhanced Thermoelectric Properties

doi:10.1021/jp401132g

GIEC OpenIR > 中国科学院广州能源研究所

	Chemical Tuning of TiO2 Nanoparticles and Sintered Compacts for Enhanced Thermoelectric Properties
	Liu, Chengyan 1,2; Miao, Lei1 ; Zhou, Jianhua1 ; Huang, Rong 3; Fisher, Craig A. J.4; Tanemura, Sakae 1,4,5
	2013-06-06
发表期刊	JOURNAL OF PHYSICAL CHEMISTRY C
卷号	117 期号:22 页码:11487-11497
摘要	A novel, fast combustion method for synthesizing anatase TiO2 nanoparticles (average diameter similar to 14 nm) codoped with N and Nb in a single step is reported. XRD, STEM-EDX, and XPS measurements confirm that Nb ions are incorporated into the tetragonal lattice on Ti sites, while N ions occupy 0 sites, and likely also interstitial sites. Sintering of pellets of codoped powders under reducing conditions produced polycrystalline samples with the rutile structure. Chemically tuned samples have power factors up to 9.87 X 10(-4) W m(-1) K-2, 7 times higher than that of pure TiO2 sintered under the same conditions. In addition, the thermal conductivity is considerably lower at 2.6-4.0 W m(-1) K-1 as a result of greater grain-boundary and point-defect scattering. The figure of merit, ZT, is improved to 0.35 at 700 degrees C, which is the highest value reported for a TiO2 material to date, and is comparable to the highest values of any n-type thermoelectric oxide. Our material also exhibits good thermal stability in a pure N-2 atmosphere and is an excellent candidate for thermoelectric power generators. Consequently, the combustion technique represents a promising new strategy for preparing foreign-atom-doped metal oxides; the chemical tuning approach, a combination of foreign-atom-doped nanoparticle synthesis and optimized sintering process, can be applied to prepare superior thermoelectric materials.
文章类型	Article
WOS标题词	Science & Technology ; Physical Sciences ; Technology
DOI	10.1021/jp401132g
研究领域[WOS]	Chemistry ; Science & Technology - Other Topics ; Materials Science
关键词[WOS]	NB-DOPED TIO2 ; ELECTRICAL-PROPERTIES ; PHOTOCATALYTIC ACTIVITY ; THERMAL-CONDUCTIVITY ; SEEBECK COEFFICIENTS ; ELECTRONIC-STRUCTURE ; TITANIUM-DIOXIDE ; DEFECT CHEMISTRY ; HIGH-TEMPERATURE ; METHYLENE-BLUE
收录类别	SCI
语种	英语
WOS类目	Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS记录号	WOS:000320214800005
引用统计	被引频次：47[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/10061
专题	中国科学院广州能源研究所
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Renewable Energy, Guangzhou 510640, Guangdong, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.E China Normal Univ, Minist Educ, Key Lab Polarized Mat & Devices, Shanghai 200062, Peoples R China 4.Japan Fine Ceram Ctr, Atsuta Ku, Nagoya, Aichi 4568587, Japan 5.Nagoya Inst Technol, Powder Technol Lab, Showa Ku, Nagoya, Aichi 4668555, Japan
第一作者单位	中国科学院广州能源研究所
推荐引用方式 GB/T 7714	Liu, Chengyan,Miao, Lei,Zhou, Jianhua,et al. Chemical Tuning of TiO2 Nanoparticles and Sintered Compacts for Enhanced Thermoelectric Properties[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2013,117(22):11487-11497.
APA	Liu, Chengyan,Miao, Lei,Zhou, Jianhua,Huang, Rong,Fisher, Craig A. J.,&Tanemura, Sakae.(2013).Chemical Tuning of TiO2 Nanoparticles and Sintered Compacts for Enhanced Thermoelectric Properties.JOURNAL OF PHYSICAL CHEMISTRY C,117(22),11487-11497.
MLA	Liu, Chengyan,et al."Chemical Tuning of TiO2 Nanoparticles and Sintered Compacts for Enhanced Thermoelectric Properties".JOURNAL OF PHYSICAL CHEMISTRY C 117.22(2013):11487-11497.