Enhancement of thermoelectric performance in Cd-doped Ca3Co4O9 via spin entropy, defect chemistry and phonon scattering
Butt, S; 徐伟;Xu, W; He, WQ; Tan, Q; Ren, GK; Lin, YH; Nan, CW
刊名JOURNAL OF MATERIALS CHEMISTRY A
2014
卷号2期号:45页码:19479-19487
学科分类Chemistry; Energy & Fuels; Materials Science
DOI10.1039/c4ta03891f
英文摘要The misfit layered cobaltate Ca3Co4O9 has been widely investigated, together with other thermoelectric transition-metals oxides, because of its natural layered structure and its strong anisotropy in its thermoelectric properties. The thermoelectric performance of Ca3Co4O9 has been optimized over the past 10 years, but a method to strategically improve the thermoelectric properties is still lacking because of the complicated interplay among the misfit structural distortions, the strong spin entropy and the anisotropic charge transportation. In this work, by combining state-of-the-art X-ray absorption fine-structure spectroscopy (XAFS), X-ray photoelectron spectroscopy and thermoelectric transport property measurements, an approach is identified for enhancing the thermoelectric performance of Ca3Co4O9. The XAFS technique, by combining experiments and multiple scattering theory, reveals unambiguously that Cd occupies the Ca site rather than other sites. The direct effect of Cd replacing Ca is an incremental increase of the charge carrier concentration and also the distinctive charge redistribution, which induces a spin-entropy enhancement in the system by changing the net valence of Co, resulting in an enhancement of the electrical conductivity and Seebeck coefficient. Furthermore, the excess Cd also forms CdO nano-inclusions, which serve as phonon scattering centers and thus reduce the total thermal conductivity. Consequently, the figure of merit, ZT, has been enhanced remarkably from 0.15 to 0.35 at 1000 K, and this is attributed to the synergy of charge redistribution, spin entropy, defect chemistry and phonon scattering.
收录类别SCI
WOS记录号WOS:000344384000044
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被引频次:19[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/225111
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
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Butt, S,徐伟;Xu, W,He, WQ,et al. Enhancement of thermoelectric performance in Cd-doped Ca3Co4O9 via spin entropy, defect chemistry and phonon scattering[J]. JOURNAL OF MATERIALS CHEMISTRY A,2014,2(45):19479-19487.
APA Butt, S.,徐伟;Xu, W.,He, WQ.,Tan, Q.,Ren, GK.,...&Nan, CW.(2014).Enhancement of thermoelectric performance in Cd-doped Ca3Co4O9 via spin entropy, defect chemistry and phonon scattering.JOURNAL OF MATERIALS CHEMISTRY A,2(45),19479-19487.
MLA Butt, S,et al."Enhancement of thermoelectric performance in Cd-doped Ca3Co4O9 via spin entropy, defect chemistry and phonon scattering".JOURNAL OF MATERIALS CHEMISTRY A 2.45(2014):19479-19487.
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