Boosting the Thermoelectric Performance of Calcium Cobaltite Composites through Structural Defect Engineering

Zongmo Shi; Can Zhang; Taichao Su; Jie Xu; Jihong Zhu; Haiyan Chen; Tong Gao; Mengjie Qin; Ping Zhang; Yi Zhang; Haixue Yan; Feng Gao

doi:10.1021/acsami.0c03297

Boosting the Thermoelectric Performance of Calcium Cobaltite Composites through Structural Defect Engineering

Zongmo Shi, Can Zhang, Taichao Su, Jie Xu, Jihong Zhu, Haiyan Chen, Tong Gao, Mengjie Qin, Ping Zhang, Yi Zhang, Haixue Yan, Feng Gao

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

22 Scopus citations

Abstract

Misfit-layered Ca₃Co₄O₉ as a p-type semiconductor is difficult to commercialize because of its relatively poor performance. Here, Ca_2.7-xLa_xAg_0.3Co₄O₉/Ag composites prepared by spark plasma sintering were systematically investigated in terms of La³⁺ dopant levels and nano-sized Ag compacts. Multiscale microstructures of stacking fault, dislocation, and oxygen vacancy-linked defects could be recognized as an effective strategy for tuning the transport of charge carriers and phonon scattering. An increasing concentration of charge carriers was caused by the introduction of nano-sized Ag particles at the grain boundary. The multiscale structural defects served as phonon scattering centers to reduce the thermal conductivity. Finally, the Ca_2.61La_0.09Ag_0.3Co₄O₉/Ag sample exhibited a maximum ZT of 0.35 at 1073 K. The results suggest that the interplay of structural defects provides an impetus for a huge improvement in thermoelectric performance.

Original language	English
Pages (from-to)	21623-21632
Number of pages	10
Journal	ACS Applied Materials and Interfaces
Volume	12
Issue number	19
DOIs	https://doi.org/10.1021/acsami.0c03297
State	Published - 13 May 2020

Keywords

CaCoO
grain boundary
spark plasma sintering
stacking fault
structural defects

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title = "Boosting the Thermoelectric Performance of Calcium Cobaltite Composites through Structural Defect Engineering",

abstract = "Misfit-layered Ca3Co4O9 as a p-type semiconductor is difficult to commercialize because of its relatively poor performance. Here, Ca2.7-xLaxAg0.3Co4O9/Ag composites prepared by spark plasma sintering were systematically investigated in terms of La3+ dopant levels and nano-sized Ag compacts. Multiscale microstructures of stacking fault, dislocation, and oxygen vacancy-linked defects could be recognized as an effective strategy for tuning the transport of charge carriers and phonon scattering. An increasing concentration of charge carriers was caused by the introduction of nano-sized Ag particles at the grain boundary. The multiscale structural defects served as phonon scattering centers to reduce the thermal conductivity. Finally, the Ca2.61La0.09Ag0.3Co4O9/Ag sample exhibited a maximum ZT of 0.35 at 1073 K. The results suggest that the interplay of structural defects provides an impetus for a huge improvement in thermoelectric performance.",

keywords = "CaCoO, grain boundary, spark plasma sintering, stacking fault, structural defects",

author = "Zongmo Shi and Can Zhang and Taichao Su and Jie Xu and Jihong Zhu and Haiyan Chen and Tong Gao and Mengjie Qin and Ping Zhang and Yi Zhang and Haixue Yan and Feng Gao",

note = "Publisher Copyright: Copyright {\textcopyright} 2020 American Chemical Society.",

year = "2020",

month = may,

day = "13",

doi = "10.1021/acsami.0c03297",

language = "英语",

volume = "12",

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T1 - Boosting the Thermoelectric Performance of Calcium Cobaltite Composites through Structural Defect Engineering

AU - Shi, Zongmo

AU - Zhang, Can

AU - Su, Taichao

AU - Xu, Jie

AU - Zhu, Jihong

AU - Chen, Haiyan

AU - Gao, Tong

AU - Qin, Mengjie

AU - Zhang, Ping

AU - Zhang, Yi

AU - Yan, Haixue

AU - Gao, Feng

PY - 2020/5/13

Y1 - 2020/5/13

N2 - Misfit-layered Ca3Co4O9 as a p-type semiconductor is difficult to commercialize because of its relatively poor performance. Here, Ca2.7-xLaxAg0.3Co4O9/Ag composites prepared by spark plasma sintering were systematically investigated in terms of La3+ dopant levels and nano-sized Ag compacts. Multiscale microstructures of stacking fault, dislocation, and oxygen vacancy-linked defects could be recognized as an effective strategy for tuning the transport of charge carriers and phonon scattering. An increasing concentration of charge carriers was caused by the introduction of nano-sized Ag particles at the grain boundary. The multiscale structural defects served as phonon scattering centers to reduce the thermal conductivity. Finally, the Ca2.61La0.09Ag0.3Co4O9/Ag sample exhibited a maximum ZT of 0.35 at 1073 K. The results suggest that the interplay of structural defects provides an impetus for a huge improvement in thermoelectric performance.

AB - Misfit-layered Ca3Co4O9 as a p-type semiconductor is difficult to commercialize because of its relatively poor performance. Here, Ca2.7-xLaxAg0.3Co4O9/Ag composites prepared by spark plasma sintering were systematically investigated in terms of La3+ dopant levels and nano-sized Ag compacts. Multiscale microstructures of stacking fault, dislocation, and oxygen vacancy-linked defects could be recognized as an effective strategy for tuning the transport of charge carriers and phonon scattering. An increasing concentration of charge carriers was caused by the introduction of nano-sized Ag particles at the grain boundary. The multiscale structural defects served as phonon scattering centers to reduce the thermal conductivity. Finally, the Ca2.61La0.09Ag0.3Co4O9/Ag sample exhibited a maximum ZT of 0.35 at 1073 K. The results suggest that the interplay of structural defects provides an impetus for a huge improvement in thermoelectric performance.

KW - CaCoO

KW - grain boundary

KW - spark plasma sintering

KW - stacking fault

KW - structural defects

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U2 - 10.1021/acsami.0c03297

DO - 10.1021/acsami.0c03297

M3 - 文章

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AN - SCOPUS:85084695573

SN - 1944-8244

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SP - 21623

EP - 21632

JO - ACS Applied Materials and Interfaces

JF - ACS Applied Materials and Interfaces

IS - 19

ER -

Boosting the Thermoelectric Performance of Calcium Cobaltite Composites through Structural Defect Engineering

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