Thermoelectric properties of NaxCo2O4/Ag composites

Seetawan, Tosawat; Amornkitbamrung, Vittaya; Burinprakhon, Thanusit; Maensiri, Santi; Kurosaki, Ken; Muta, Hiroaki; Uno, Masayoshi; Yamanaka, Shinşuke

doi:10.1016/j.jallcom.2005.07.067

Cited by 21 publications

(14 citation statements)

References 13 publications

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“…The finer microstructure is effective for reducing the thermal conductivity due to enhanced phonon scattering. It is also apparent that Ä values for NaCo 0.9 Ni 0.1 O 2 are low compared with the substituted NaCo 2 O 4 -based samples reported in other studies, e.g., NaCo 2−x M x O 4 (M: Ti, Rh, Pd, or Ag) [17,26,27]. Fig.…”

Section: Sample Characteristicsmentioning

confidence: 72%

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

Wang

Zhao

2009

Journal of Alloys and Compounds

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Section: Sample Characteristicsmentioning

confidence: 72%

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

Wang

Zhao

2009

Journal of Alloys and Compounds

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“…The ceramic density also increases with the increasing pressure significantly when the content of Ag dopant is invariable. The minimum density of nondoped sample was 3.16 g cm −3 when the pressure was 600 MPa, and the density of Ag-doped 0.5 ceramic reaches the maximum 4.638 g cm −3 when the pressure enhanced to 1000 MPa, which is obviously larger than that of the former reported (4.25 g cm −3 ) [19]. These results imply that doping with silver could improve the compactibility of the synthesized powder, and accordingly enlarge the ceramic densities, which is beneficial for promoting the electrical conductivity of Na x Ag y Co 2−y O 4 .…”

Section: Resultsmentioning

confidence: 59%

“…Some nomination compositions of Na x Co 2 O 4 doped with Ag have also been obtained via PC method, which have shown a better power factor and S value [19]. In our experiments, ␥-Na x Co 2 O 4 (x = 1.5, 1.6, 1.7) and Na x Ag y Co 2−y O 4 (x = 1.7 and y = 0, 0.1, 0.2, 0.3, 0.4, 0.5) were prepared by the self-ignition route.…”

Section: Introductionmentioning

confidence: 99%

Self-ignition route to Ag-doped Na1.7Co2O4 and its thermoelectric properties

Jiang

et al. 2009

Journal of Alloys and Compounds

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“…Silver doping increases electrical conductivity and thermopower and decreases thermal conductivity [165,166]. If Ag is doped as second phase, it can increase electrical conductivity and thermopower, but also increase thermal conductivity, so its effect on figure of merit is canceled out [167].…”

Section: P-type Thermoelectric Oxidesmentioning

confidence: 99%

Waste Thermal Energy Harvesting (I): Thermoelectric Effect

Kong

Hng

et al. 2014

Waste Energy Harvesting

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Waste thermal energy (heat) is the second type of energy to be discussed. Usually, it is generated in a process by way of fuel combustion or chemical reaction, and then ''dumped'' into the environment even though it could still be reused for some useful and economic purpose. The essential quality of heat is not the amount but rather its ''value.'' The strategy of how to recover this heat depends in part on the temperature of the waste heat gases and the economics involved.Waste thermal energy is one of the largest sources of inexpensive, clean, and fuel-free energy available. The vast amount of heat that is discharged into the atmosphere everyday is one of the best sources of clean, fuel-free, and inexpensive energy. According to the US Department of Energy (DOE), up to 50 % of all fuels burned in the US goes unused into the atmosphere as waste heat is released to the atmosphere. Research indicates that the energy currently wasted by the industrial facilities in the U.S. could produce as much as 20 % of the total US electrical output with the associated 20 % reduction in greenhouse gas emissions. Various sources that can be classified as waste thermal energy (heat) with their properties are listed in Tables 4.1 , 4.2, 4.3, and 4.4 [1].Among the large quantities of waste heat that have been directly discharged into the Earth's environment, much of it is at temperatures which are too low to recover by using the conventional electrical power generators. Thermoelectric power generation, also known as thermoelectricity, has been demonstrated as a promising technology in the direct conversion of low-grade thermal energy, such as waste heat energy into electrical power. Probably, the earliest application is the utilization of waste heat from a kerosene lamp to provide thermoelectric energy to power a wireless device. Thermoelectric generators have also been used to provide small amounts electricity to remote regions, for instance, Northern Sweden, as an L. B. Kong et al., Waste Energy Harvesting, Lecture Notes in Energy 24,

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Thermoelectric properties of NaxCo2O4/Ag composites

Cited by 21 publications

References 13 publications

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

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

Self-ignition route to Ag-doped Na1.7Co2O4 and its thermoelectric properties

Waste Thermal Energy Harvesting (I): Thermoelectric Effect

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