Thermoelectric properties of c-axis oriented Ni-substituted NaCoO2 thermoelectric oxide by the citric acid complex method

Wang, Lei; Wang, Ming; Zhao, Dongliang

doi:10.1016/j.jallcom.2008.04.013

Cited by 38 publications

(20 citation statements)

References 24 publications

(31 reference statements)

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“…The shade of the circles represents the concentration of the dopants as expressed in the legend of (b). The data are taken from the following works: K [5], Mn [10], Ni [17]. Cu [14], Zn [16,18], Sr and Y [5], Ru [10], Ag [12,15], Nd [5], Sm [5,11], Dy [11], Yb [5,11], Au [15].…”

Section: Resultsmentioning

confidence: 99%

Restoration of long range order of Na ions in NaxCoO2 at high temperatures by sodium site doping

Assadi

Katayama‐Yoshida

2015

Computational Materials Science

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a b s t r a c tWe have systematically investigated the Na x CoO 2 system doped with Cu, Y, Sn, W, Au and Bi for x = 0.5, 0.75 and 1.00 using density functional theory. Sn, W and Bi always substitute a Co while Au always substitute a Na regardless of Na concentration. However, for, Cu and Y, the substitution site depends on Na concentration. When compared to the available experimental data, we find that thermoelectric performance is enhanced when the dopants substitute a Na site. In this case, surprisingly, resistivity decreases despite the reduced hole concentration caused by carrier recombination. We propose improved carrier mobility to be the cause of observed reduced resistivity.

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Section: Resultsmentioning

confidence: 99%

Restoration of long range order of Na ions in NaxCoO2 at high temperatures by sodium site doping

Assadi

Katayama‐Yoshida

2015

Computational Materials Science

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“…With 10% Ag doping, Na x CoO 2 achieved the PF as high as 18.92 × 10 −4 W/mK 2 at~1100 K with the carrier density of~10 21 /cm 3 [35]. Compared with un-doped NaCoO 2 , other dopants (Y, Nd, Sr, Sm) have little effects on improving PF values [36], and some dopants (Ni, Yb) even have negative effects [36,37]. Because of the interdependent relations between the Seebeck coefficient and electrical conductivity, these dopants often improve one while they degrade the other.…”

Section: Fundamental Physics Of Thermoelectric Metal Oxidesmentioning

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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“…Extensive investigation has been carried out on the partial substitution of various elements either into the Na or Co sites [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The latter includes tri-and tetravalent ions [16][17][18][19], as well as divalent ions such as Zn 2+ , Ni 2+ and Pd 2+ [12][13][14]. However, since Ni and Pd may exist in several valence states, the transport mechanisms are difficult to analyze.…”

Section: Introductionmentioning

confidence: 99%