Thermoelectric performance of Nb-doped SrTiO3 enhanced by reduced graphene oxide and Sr deficiency cooperation
作者： Olena Okhay , Sebastian Zlotnik , Wenjie Xie , Krzysztof Orlinski , Maria J Hortiguela Gallo
DOI: 10.1016/J.CARBON.2018.11.023
关键词:
摘要: Abstract Oxide materials are of current interest as high-temperature thermoelectrics in the automotive and manufacturing energy-harvesting sectors due to high chemical robustness, low toxicity cost. Driven by a need improve thermoelectric performance n-type oxides level p-type analogues, ceramics composites based on donor-doped SrTiO3 considered promising material. Here Nb-doped with Nb content 10 15% well Sr/(Nb + Ti) ratio 1.00 0.98 was mixed 0.6 wt. % graphene oxide (GO) prepared Hummer-based method conventionally sintered atmosphere H2/N2 reduce both GO. Addition reduced GO combination introduction Sr vacancies provides synergistic effect fastening charge transport thereby increasing electrical conductivity σ suppressing thermal κ. These factors, together moderate Seebeck coefficient S, result power factor PF = S2 × σ up ∼1.98 mW/(K2m) figure merit ZT = PF × T/κ 0.29. findings offer further prospects for seeking SrTiO3-based modification
sci-hub.se 参考文章(44)
Ryoji Funahashi, Masahiro Shikano, Bi2Sr2Co2Oy whiskers with high thermoelectric figure of merit Applied Physics Letters. ,vol. 81, pp. 1459- 1461 ,(2002) , 10.1063/1.1502190
Boyu Zhang, Jun Wang, Tao Zou, Shuai Zhang, Xinba Yaer, Nan Ding, Chengyan Liu, Lei Miao, Yan Li, Yin Wu, High thermoelectric performance of Nb-doped SrTiO3 bulk materials with different doping levels Journal of Materials Chemistry C. ,vol. 3, pp. 11406- 11411 ,(2015) , 10.1039/C5TC02016F
Jingdu Dong, Wei Liu, Han Li, Xianli Su, Xinfeng Tang, Ctirad Uher, In situ synthesis and thermoelectric properties of PbTe–graphene nanocomposites by utilizing a facile and novel wet chemical method Journal of Materials Chemistry. ,vol. 1, pp. 12503- 12511 ,(2013) , 10.1039/C3TA12494K
H.L. Cai, X.S. Wu, J. Gao, Effect of oxygen content on structural and transport properties in SrTiO3−x thin films Chemical Physics Letters. ,vol. 467, pp. 313- 317 ,(2009) , 10.1016/J.CPLETT.2008.11.071
Matthew S. J. Marshall, David T. Newell, David J. Payne, Russell G. Egdell, Martin R. Castell, Atomic and electronic surface structures of dopants in oxides: STM and XPS of Nb- and La-doped SrTiO 3 (001) Physical Review B. ,vol. 83, pp. 035410- ,(2011) , 10.1103/PHYSREVB.83.035410
A. V. Kovalevsky, A. A. Yaremchenko, S. Populoh, P. Thiel, D. P. Fagg, A. Weidenkaff, J. R. Frade, Towards a high thermoelectric performance in rare-earth substituted SrTiO3: effects provided by strongly-reducing sintering conditions. Physical Chemistry Chemical Physics. ,vol. 16, pp. 26946- 26954 ,(2014) , 10.1039/C4CP04127E
Cong Chen, Tianshu Zhang, Richard Donelson, Thiam Teck Tan, Sean Li, Effects of yttrium substitution and oxygen deficiency on the crystal phase, microstructure, and thermoelectric properties of Sr1−1.5xYxTiO3−δ (0⩽x⩽0.15) Journal of Alloys and Compounds. ,vol. 629, pp. 49- 54 ,(2015) , 10.1016/J.JALLCOM.2014.12.125
D. Dragoman, M. Dragoman, Giant thermoelectric effect in graphene Applied Physics Letters. ,vol. 91, pp. 203116- ,(2007) , 10.1063/1.2814080
A. Tkach, T.M. Correia, A. Almeida, J. Agostinho Moreira, M.R. Chaves, O. Okhay, P.M. Vilarinho, I. Gregora, J. Petzelt, Role of trivalent Sr substituents and Sr vacancies in tetragonal and polar states of SrTiO3 Acta Materialia. ,vol. 59, pp. 5388- 5397 ,(2011) , 10.1016/J.ACTAMAT.2011.05.011
Hyun-Sik Kim, Zachary M. Gibbs, Yinglu Tang, Heng Wang, G. Jeffrey Snyder, Characterization of Lorenz number with Seebeck coefficient measurement APL Materials. ,vol. 3, pp. 041506- ,(2015) , 10.1063/1.4908244