The effects of dual doping on the thermoelectric properties of Ca3−xMxCo4−yCuyO9 (M=Na, La)

Ou, Yun; Peng, Jinfeng; Li, F.; Yu, Zhaoxin; Ma, Feiyue; Xie, Shuhong; Li, J.-F.; Li, J.Y.

doi:10.1016/j.jallcom.2012.02.112

Cited by 25 publications

(8 citation statements)

References 49 publications

(57 reference statements)

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“…The maximum increase is obtained for the 0.07 and 0.10Na-doped samples (~ 75 % higher than the undoped ones). The maximum PF value at room temperature (about 0.14 mW/K 2 .m) is slightly lower than the values found in Cu and Na codoped prepared by sol-gel and consolidated by SPS (around 0.17 mW/K 2 .m) [43]. On the other hand, the highest PF value obtained at 800 ºC (around 0.32 mW/K 2 .m) for the 0.07Nadoped samples is lower than the obtained in Bi and Na cosubstituted samples prepared by TGG followed by hot uniaxial pressing (about 0.60 mW/K 2 .m) [45], but much higher than the measured in samples with the same composition prepared by TGG and consolidated by cold isostatic pressing ( 0.12 mW/K 2 .m).…”

Section: Resultscontrasting

confidence: 62%

“…The room temperature values are approximately the same for all samples, independently of Na content. This measured value (around 135 V/K) is slightly higher than those reported elsewhere at room temperature for 0, 0.3, and 0.5Na-doped hot uniaxial pressed samples (~ 120 V/K)[42].Moreover, they show the same values found in Cu and Na codoped samples (about 135 V/K) prepared by SPS[43]. On the other hand, when considering the maximum S values at 800 ºC (~ 215 V/K), they are higher than the obtained in Bi and Na substituted samples processed by SPS (around 185V/K)[44], or by TGG followed by hot uniaxial pressing (about 185V/K)[45].…”

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confidence: 53%

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Effect of Na doping on the Ca3Co4O9 thermoelectric performance

Constantinescu

Rasekh²,

Торрес³

et al. 2015

Ceramics International

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The MYRTE platform consists of a photovoltaic array, a fuel cells, an electrolyzer, tanks (H 2 , O 2 and H 2 O), a thermal management system and electricity converters associated to various sub-systems. The aim of this platform is to study how hydrogen could be a good solution for storage energy associated to intermittent renewable energy sources systems, like photovoltaic plant, for electrical grid application, in an island context. This article describes the platform's way of operating and specifically the photovoltaic output power fluctuations smoothing, with the trapezoid profile shape, using storage methodology and his association with solar forecasting. The used approach is consistent with the specifications of the invitation to tender of the French Energy Regulation Commission, in September, 2011. Note that during the simulations, we have firstly used measured and not predicted meteorological data, and at this end of this paper the first estimation with our solar forecasting methodology. The main result shown in this paper is that the platform is compatible with this operational mode based on the power fluctuations smoothing. However, to minimize the use of hydrogen stored it is necessary that the supply of the trapezoid profile comes from the PV production rather than the fuel cells. A minimum part of 76 % seems necessary

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Section: Resultscontrasting

confidence: 62%

supporting

confidence: 53%

Effect of Na doping on the Ca3Co4O9 thermoelectric performance

Constantinescu

Rasekh²,

Торрес³

et al. 2015

Ceramics International

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“…It has the obviously significance impacts on thermoelectric properties of CCO ceramics. Ou et al 15 prepared the (La, Cu) co-doped CCO ceramics using spark plasma sintering process. It was noticed that the dual doping by Cu 2+ and La 3+ resulted in the substantial increase in electrical conductivity, leading to enhancement in thermoelectric performance of CCO ceramics.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and thermoelectric performance of La‐doped (Ca_0.9Ag_0.1)₃Co₄O₉/nano‐sized Ag composite ceramics

Shi

Zhang

et al. 2019

Int J Ceramic Engine & Sci

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Ca 0.9-x Ag 0.1 La x ) 3 Co 4 O 9 /nano-sized Ag thermoelectric composite ceramics were fabricated by solid-state reaction method. The influences of La 3+ dopants on the microstructure, band gaps, and thermoelectric properties were investigated. X-ray photoelectron spectroscopy fitting results showed that the reduction of oxygen vacancy and the increment of trivalent cobalt concentration could significantly improve thermoelectric performance. With the increasing of La 3+ dopants level, the band gaps of samples enlarged. Electrical resistivity decreased from 21.3 to 17.2 mΩ·cm, while Seebeck coefficient increased from 113.3 to 182.3 μV/K. Furthermore, the peak ZT value of 0.18 was obtained at 1073 K for the x = 0.03 sample, resulting from the lower thermal conductivity of 1.05 W/(m·K). The obtained results suggest that the La 3+ substitution, oxygen vacancy, and Ag inclusions can dramatically improve the thermoelectric performance of Ca 3 Co 4 O 9 composites. K E Y W O R D S (Ca 0.9-x Ag 0.1 La x ) 3 Co 4 O 9 , electrical conductivity, nano-sized Ag, thermoelectric composites 8 | SHI et al.

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“…It has widely been accepted that CCO exhibits strong electronic correlation and chemically stability at higher temperature, therefore, many researchers have suggested it as a p ‐type OTE candidate for high‐temperature applications but the lower ZT value of polycrystalline CCO restricts its practical application in commercial TE devices. To improve its TE efficiency, several reports have focused on an elemental doping at Ca‐site, Co‐site, and codoping but only a few reports could be found on composites of CCO …”

Section: Introductionmentioning

confidence: 99%

Enhancement of Thermoelectric Performance in Hierarchical Mesoscopic Oxide Composites of Ca₃Co₄O₉ and La_0.8Sr_0.2CoO₃

Butt

Farooq

et al. 2015

J. Am. Ceram. Soc.

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The natural contradiction in enhancing electrical conductivity and thermopower in thermoelectric oxides makes it hard to improve the performance of a single thermoelectric oxide material. We report a facile method to construct a unique architecture of thermoelectric oxides that is promising to realize a simultaneous improvement of overall electrical conductivity and thermopower. Here, a series of two-phase nanocomposites comprising of Ca 3 Co 4 O 9 (CCO) and La 0.8 Sr 0.2 CoO 3 (LSCO) has been synthesized through ball milling followed by spark plasma sintering (SPS) method. The electron microscope images reveal that the two constituents form the unique composites while retaining their individual crystalline and morphological identities. Owing to the hierarchical mesoscopic structure with nanoscale particles and submicrometer scale grain boundaries, an external strain is induced into the CCO grains by the LSCO nanoparticles to enhance the thermopower. The mesoscopic structure is also favorable for improving the electrical conductivity. Moreover, the long-wavelength phonons can be scattered effectively from LSCO nanoparticles and the thermal conductivity is further suppressed. With compromises between power factor and thermal conductivity, the largest ZT achieved is up to 0.41 at 1000 K for the composites with 25 wt% of LSCO.

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The effects of dual doping on the thermoelectric properties of Ca3−xMxCo4−yCuyO9 (M=Na, La)

Cited by 25 publications

References 49 publications

Effect of Na doping on the Ca3Co4O9 thermoelectric performance

Effect of Na doping on the Ca3Co4O9 thermoelectric performance

Microstructure and thermoelectric performance of La‐doped (Ca_0.9Ag_0.1)₃Co₄O₉/nano‐sized Ag composite ceramics

Enhancement of Thermoelectric Performance in Hierarchical Mesoscopic Oxide Composites of Ca₃Co₄O₉ and La_0.8Sr_0.2CoO₃

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The effects of dual doping on the thermoelectric properties of Ca3−xMxCo4−yCuyO9 (M=Na, La)

Cited by 25 publications

References 49 publications

Effect of Na doping on the Ca3Co4O9 thermoelectric performance

Effect of Na doping on the Ca3Co4O9 thermoelectric performance

Microstructure and thermoelectric performance of La‐doped (Ca0.9Ag0.1)3Co4O9/nano‐sized Ag composite ceramics

Enhancement of Thermoelectric Performance in Hierarchical Mesoscopic Oxide Composites of Ca3Co4O9 and La0.8Sr0.2CoO3

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Product

Resources

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Microstructure and thermoelectric performance of La‐doped (Ca_0.9Ag_0.1)₃Co₄O₉/nano‐sized Ag composite ceramics

Enhancement of Thermoelectric Performance in Hierarchical Mesoscopic Oxide Composites of Ca₃Co₄O₉ and La_0.8Sr_0.2CoO₃