Thermoelectrics in misfit-layered oxides [(Ca,Ln) 2CoO 3] 0.62[CoO 2]: From bulk to nano

Yang Wang; Yu Sui; Fang Li; Luxiang Xu; Xianjie Wang; Wenhui Su; Xiaoyang Liu

doi:10.1016/j.nanoen.2012.02.007

Thermoelectrics in misfit-layered oxides [(Ca,Ln) ₂CoO ₃] _0.62[CoO ₂]: From bulk to nano

Yang Wang^*
, Yu Sui
, Fang Li
, Luxiang Xu
, Xianjie Wang
, Wenhui Su
, Xiaoyang Liu

^*Corresponding author for this work

School of Physics

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

Thermoelectric (TE) properties of [(Ca,Ln) ₂CoO ₃] _0.62[CoO ₂] family, including ceramic bulks synthesized by a solid-state reaction and nano-sized compacts fabricated by a simple cold-pressure method, are systematically investigated, in terms of nanocrystallization technology, effects of doped rare-earth Ln ions, and doping level. The doped Ln ions have noticeable influences on the TE characteristics of [Ca ₂CoO ₃] _0.62[CoO ₂] system. The substitutions of Ln ³⁺ for Ca ²⁺ change hole concentration and meanwhile introduce a strong point-defect phonon scattering. From Ln=La to Yb, the increased structural distortion, enhanced electron correlation, and increasing ionic mass fluctuation are responsible for the different TE response. Furthermore, compared with the ceramic bulks, in the highly textured nano-sized compacts the thermal conduction is efficiently suppressed. A doubling of ZT has been achieved by the nanoengineering (ZT exceeds 0.45 at 1000K). On the basis of these results, some strategies for further improvement in ZT are proposed.

Original language	English
Pages (from-to)	456-465
Number of pages	10
Journal	Nano Energy
Volume	1
Issue number	3
DOIs	https://doi.org/10.1016/j.nanoen.2012.02.007
State	Published - May 2012

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Layered cobaltite
Nanocrystal
Thermal conductivity
Thermoelectrics

Access to Document

10.1016/j.nanoen.2012.02.007

Cite this

@article{1a0da1985411410f89e2febb24d8e4d3,

title = "Thermoelectrics in misfit-layered oxides [(Ca,Ln) 2CoO 3] 0.62[CoO 2]: From bulk to nano",

abstract = "Thermoelectric (TE) properties of [(Ca,Ln) 2CoO 3] 0.62[CoO 2] family, including ceramic bulks synthesized by a solid-state reaction and nano-sized compacts fabricated by a simple cold-pressure method, are systematically investigated, in terms of nanocrystallization technology, effects of doped rare-earth Ln ions, and doping level. The doped Ln ions have noticeable influences on the TE characteristics of [Ca 2CoO 3] 0.62[CoO 2] system. The substitutions of Ln 3+ for Ca 2+ change hole concentration and meanwhile introduce a strong point-defect phonon scattering. From Ln=La to Yb, the increased structural distortion, enhanced electron correlation, and increasing ionic mass fluctuation are responsible for the different TE response. Furthermore, compared with the ceramic bulks, in the highly textured nano-sized compacts the thermal conduction is efficiently suppressed. A doubling of ZT has been achieved by the nanoengineering (ZT exceeds 0.45 at 1000K). On the basis of these results, some strategies for further improvement in ZT are proposed.",

keywords = "Layered cobaltite, Nanocrystal, Thermal conductivity, Thermoelectrics",

author = "Yang Wang and Yu Sui and Fang Li and Luxiang Xu and Xianjie Wang and Wenhui Su and Xiaoyang Liu",

year = "2012",

month = may,

doi = "10.1016/j.nanoen.2012.02.007",

language = "英语",

volume = "1",

pages = "456--465",

journal = "Nano Energy",

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TY - JOUR

T1 - Thermoelectrics in misfit-layered oxides [(Ca,Ln) 2CoO 3] 0.62[CoO 2]

T2 - From bulk to nano

AU - Wang, Yang

AU - Sui, Yu

AU - Li, Fang

AU - Xu, Luxiang

AU - Wang, Xianjie

AU - Su, Wenhui

AU - Liu, Xiaoyang

PY - 2012/5

Y1 - 2012/5

N2 - Thermoelectric (TE) properties of [(Ca,Ln) 2CoO 3] 0.62[CoO 2] family, including ceramic bulks synthesized by a solid-state reaction and nano-sized compacts fabricated by a simple cold-pressure method, are systematically investigated, in terms of nanocrystallization technology, effects of doped rare-earth Ln ions, and doping level. The doped Ln ions have noticeable influences on the TE characteristics of [Ca 2CoO 3] 0.62[CoO 2] system. The substitutions of Ln 3+ for Ca 2+ change hole concentration and meanwhile introduce a strong point-defect phonon scattering. From Ln=La to Yb, the increased structural distortion, enhanced electron correlation, and increasing ionic mass fluctuation are responsible for the different TE response. Furthermore, compared with the ceramic bulks, in the highly textured nano-sized compacts the thermal conduction is efficiently suppressed. A doubling of ZT has been achieved by the nanoengineering (ZT exceeds 0.45 at 1000K). On the basis of these results, some strategies for further improvement in ZT are proposed.

AB - Thermoelectric (TE) properties of [(Ca,Ln) 2CoO 3] 0.62[CoO 2] family, including ceramic bulks synthesized by a solid-state reaction and nano-sized compacts fabricated by a simple cold-pressure method, are systematically investigated, in terms of nanocrystallization technology, effects of doped rare-earth Ln ions, and doping level. The doped Ln ions have noticeable influences on the TE characteristics of [Ca 2CoO 3] 0.62[CoO 2] system. The substitutions of Ln 3+ for Ca 2+ change hole concentration and meanwhile introduce a strong point-defect phonon scattering. From Ln=La to Yb, the increased structural distortion, enhanced electron correlation, and increasing ionic mass fluctuation are responsible for the different TE response. Furthermore, compared with the ceramic bulks, in the highly textured nano-sized compacts the thermal conduction is efficiently suppressed. A doubling of ZT has been achieved by the nanoengineering (ZT exceeds 0.45 at 1000K). On the basis of these results, some strategies for further improvement in ZT are proposed.

KW - Layered cobaltite

KW - Nanocrystal

KW - Thermal conductivity

KW - Thermoelectrics

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DO - 10.1016/j.nanoen.2012.02.007

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