High temperature thermoelectric properties of co-doped Ca3−xAgxCo3.95Fe0.05O9+δ (0≤x≤0.3)

Bhaskar, Ankam; Yang, Zihao

doi:10.1016/j.ceramint.2015.04.121

Cited by 5 publications

(5 citation statements)

References 32 publications

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“…, respectively, at room temperature [41]. It was reported that doping noble metals, such as Ag, at the Ca cationic atom site can simultaneously increase the Seebeck coefficient and electrical transport properties, thus resulting in an enhanced PF [42]. This is mainly due to the substitution of Ag + for Ca 2+ in Ca 3 −x Ag x Co 4 O 9 (0 < x < 0.3) which results in more improvement for the Fermi-level E F than that for the valence band energy E V of the crystal system [43].…”

Section: Ca 3 Co 4 Omentioning

confidence: 99%

Metal oxides for thermoelectric power generation and beyond

Feng

Jiang

Ghafari

et al. 2017

Adv Compos Hybrid Mater

116

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Metal oxides are widely used in many applications such as thermoelectric, solar cells, sensors, transistors, and optoelectronic devices due to their outstanding mechanical, chemical, electrical, and optical properties. For instance, their high Seebeck coefficient, high thermal stability, and earth abundancy make them suitable for thermoelectric power generation, particularly at a high-temperature regime. In this article, we review the recent advances of developing high electrical properties of metal oxides and their applications in thermoelectric, solar cells, sensors, and other optoelectronic devices. The materials examined include both narrow-band-gap (e.g., Na x CoO 2 , Ca 3 Co 4 O 9 , BiCuSeO, CaMnO 3 , SrTiO 3 ) and wide-band-gap materials (e.g., ZnO-based, SnO 2 -based, In 2 O 3 -based). Unlike previous review articles, the focus of this study is on identifying an effective doping mechanism of different metal oxides to reach a high power factor. Effective dopants and doping strategies to achieve high carrier concentration and high electrical conductivities are highlighted in this review to enable the advanced applications of metal oxides in thermoelectric power generation and beyond.

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Section: Ca 3 Co 4 Omentioning

confidence: 99%

Metal oxides for thermoelectric power generation and beyond

Feng

Jiang

Ghafari

et al. 2017

Adv Compos Hybrid Mater

116

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“…Therefore, the development of TE materials with high ZT values is the key factor in improving the efficiency of TE generators [5,9,10]. This ZT value is expressed as follows [11,12]:…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, CCO ceramic becomes an important candidate for TE power generation in automobiles owing to these advantages, but it has relatively low ZT values due its high electrical resistivity [20,21]. In general, there are two approaches to improve the TE performance of CCO, these are doping technique [22,23] and using advanced fabrication methods (hot-pressing, spark plasma sintering, etc) [10,12]. By means of these approaches, electron and phonon transport can be controlled separately and it becomes possible to improve the ZT value of CCO ceramic [7,24].…”

Section: Introductionmentioning

confidence: 99%

“…Doping has implemented on either the Ca site; Fe [12,21], Cu [25,26], Ba [27], Ag [22,24], Bi [28], Tb [29,30], Nd [31], Gd [30], Cr [32], Er [30] or the Co sites; Cr [33], Mn [25,34], Ni [33], Zn [33], Cu [35,36], Fe [33]. Although most of the studies have focused on single site substitution on Ca-site or Co-site, there are limited studies on the effects of co-doping on TE properties of CCO ceramics.…”

Section: Introductionmentioning

confidence: 99%

“…Although most of the studies have focused on single site substitution on Ca-site or Co-site, there are limited studies on the effects of co-doping on TE properties of CCO ceramics. For instance, CCO was co-doped with Lu-Ni (ZT: 0.0185 at 350 K) [37], Ni-Ce (ZT: 0.022 at 350 K) [38], Fe-Eu (ZT: 0.027) [39], Bi-Fe (ZT: 0.4 at 973 K) [20], Y-Fe (18% higher ZT value than that of undoped sample) [23], Ag-Fe (ZT: 0.027 at 300 K) [12].…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of high temperature thermoelectric performance of cobaltite based materials for automotive exhaust thermoelectric generators

BAYATA¹

2021

Smart Mater. Struct.

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Thermoelectric (TE) generators can directly convert exhaust waste heat into electricity in vehicles. However, the low conversion efficiency of TE generators is the main obstacle to their commercialization in automotive. Their efficiency mainly depends on the performance of the used materials which is quantified by the figure of merit (ZT value). In the present study, single- and co-doped calcium cobaltites(CCO) with rare-earth (Tb) and transition metals (Cu, Fe, Ni, Mn, Cr) were produced using sol-gel technique in order to improve their high temperature thermoelectric properties for heat recovery in exhaust manifold applications. By the combined effect of doping approach and the production technique used in this study, a remarkable decrease in the grain size of CCO was obtained, and thus its thermal conductivity dramatically decreased. Besides, thermopower values were improved significantly. The reduction in thermal conductivity and the increase in thermopower led to an enhancement in ZT value of CCO ceramics. Among all the co-doped samples, Tb-Cu co-doped CCO displayed the maximum ZT value of 0.116 at 873 K which is 2.5 times larger than that of pure CCO. The high thermal stability and the enhanced thermoelectric performance make Tb-Cu co-doped CCO material a potential candidate for heat recovery in automotive exhaust thermoelectric generators.

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