Optimization of Synthesis Conditions of Na0.75CoO2 for High Thermoelectric Performance

Jang Yeul Tak; Kyu Hyoung Lee; Jong Young Kim; Chang Hyun Lim; Won Seon Seo; Young Soo Lim; Hyung Koun Cho; Soon Mok Choi

doi:10.1007/s11664-014-3384-y

Optimization of Synthesis Conditions of Na_0.75CoO₂ for High Thermoelectric Performance

Jang Yeul Tak
, Kyu Hyoung Lee
, Jong Young Kim
, Chang Hyun Lim
, Won Seon Seo
, Young Soo Lim
, Hyung Koun Cho
, Soon Mok Choi

Department of Advanced Materials Science and Engineering

Korea Institute of Ceramic Engineering And Technology
Sungkyunkwan University
Kangwon National University
Korea University of Technology and Education

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

6 Scopus citations

Abstract

Reproducibility of phase formation has been an important issue in tailoring electronic and thermal transport properties of Na_xCoO₂-based thermoelectric materials; however, optimized synthesis conditions for single phase of polycrystalline Na_xCoO₂ remain unsatisfactory. Here, we show that phase formation of a Na-Co-O-based system can be controlled by adjusting the reaction temperature. Single phase of Na_0.75CoO₂ was fabricated by optimized heat treatment for both suppression of Na₂O vaporization and CoO phase formation. The largest thermoelectric power factor of the present compound (∼5.4 × 10⁻⁴ W/mK² at 973 K) is comparable to that of reported values for single phase polycrystalline Na_xCoO₂ bulks. In addition, Na_0.75CoO₂ phase obtained by this approach was confirmed to be stable at high temperatures up to 1000 K.

Original language	English
Pages (from-to)	1408-1412
Number of pages	5
Journal	Journal of Electronic Materials
Volume	44
Issue number	6
DOIs	https://doi.org/10.1007/s11664-014-3384-y
State	Published - 1 Jun 2015

Keywords

NaCoO
phase formation
polycrystalline
thermoelectric oxide

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10.1007/s11664-014-3384-y

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title = "Optimization of Synthesis Conditions of Na0.75CoO2 for High Thermoelectric Performance",

abstract = "Reproducibility of phase formation has been an important issue in tailoring electronic and thermal transport properties of NaxCoO2-based thermoelectric materials; however, optimized synthesis conditions for single phase of polycrystalline NaxCoO2 remain unsatisfactory. Here, we show that phase formation of a Na-Co-O-based system can be controlled by adjusting the reaction temperature. Single phase of Na0.75CoO2 was fabricated by optimized heat treatment for both suppression of Na2O vaporization and CoO phase formation. The largest thermoelectric power factor of the present compound (∼5.4 × 10−4 W/mK2 at 973 K) is comparable to that of reported values for single phase polycrystalline NaxCoO2 bulks. In addition, Na0.75CoO2 phase obtained by this approach was confirmed to be stable at high temperatures up to 1000 K.",

keywords = "NaCoO, phase formation, polycrystalline, thermoelectric oxide",

author = "Tak, \{Jang Yeul\} and Lee, \{Kyu Hyoung\} and Kim, \{Jong Young\} and Lim, \{Chang Hyun\} and Seo, \{Won Seon\} and Lim, \{Young Soo\} and Cho, \{Hyung Koun\} and Choi, \{Soon Mok\}",

note = "Publisher Copyright: {\textcopyright} 2014, The Minerals, Metals \& Materials Society.",

year = "2015",

month = jun,

day = "1",

doi = "10.1007/s11664-014-3384-y",

language = "English",

volume = "44",

pages = "1408--1412",

journal = "Journal of Electronic Materials",

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publisher = "Springer New York",

number = "6",

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TY - JOUR

T1 - Optimization of Synthesis Conditions of Na0.75CoO2 for High Thermoelectric Performance

AU - Tak, Jang Yeul

AU - Lee, Kyu Hyoung

AU - Kim, Jong Young

AU - Lim, Chang Hyun

AU - Seo, Won Seon

AU - Lim, Young Soo

AU - Cho, Hyung Koun

AU - Choi, Soon Mok

PY - 2015/6/1

Y1 - 2015/6/1

N2 - Reproducibility of phase formation has been an important issue in tailoring electronic and thermal transport properties of NaxCoO2-based thermoelectric materials; however, optimized synthesis conditions for single phase of polycrystalline NaxCoO2 remain unsatisfactory. Here, we show that phase formation of a Na-Co-O-based system can be controlled by adjusting the reaction temperature. Single phase of Na0.75CoO2 was fabricated by optimized heat treatment for both suppression of Na2O vaporization and CoO phase formation. The largest thermoelectric power factor of the present compound (∼5.4 × 10−4 W/mK2 at 973 K) is comparable to that of reported values for single phase polycrystalline NaxCoO2 bulks. In addition, Na0.75CoO2 phase obtained by this approach was confirmed to be stable at high temperatures up to 1000 K.

AB - Reproducibility of phase formation has been an important issue in tailoring electronic and thermal transport properties of NaxCoO2-based thermoelectric materials; however, optimized synthesis conditions for single phase of polycrystalline NaxCoO2 remain unsatisfactory. Here, we show that phase formation of a Na-Co-O-based system can be controlled by adjusting the reaction temperature. Single phase of Na0.75CoO2 was fabricated by optimized heat treatment for both suppression of Na2O vaporization and CoO phase formation. The largest thermoelectric power factor of the present compound (∼5.4 × 10−4 W/mK2 at 973 K) is comparable to that of reported values for single phase polycrystalline NaxCoO2 bulks. In addition, Na0.75CoO2 phase obtained by this approach was confirmed to be stable at high temperatures up to 1000 K.

KW - NaCoO

KW - phase formation

KW - polycrystalline

KW - thermoelectric oxide

UR - https://www.scopus.com/pages/publications/84928681084

U2 - 10.1007/s11664-014-3384-y

DO - 10.1007/s11664-014-3384-y

M3 - Article

AN - SCOPUS:84928681084

SN - 0361-5235

VL - 44

SP - 1408

EP - 1412

JO - Journal of Electronic Materials

JF - Journal of Electronic Materials

IS - 6

ER -

Optimization of Synthesis Conditions of Na_0.75CoO₂ for High Thermoelectric Performance

Abstract

Keywords

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