International Round-Robin Study of the Thermoelectric Transport Properties of an n-Type Half-Heusler Compound from 300 K to 773 K

Wang, Hsin; Bai, Shengqiang; Chen, Lidong; Cuenat, Alexander; Joshi, Giri; Kleinke, Holger; König, Jan; Lee, Hee Woong; Martin, Joshua; Oh, Min‐Wook; Porter, Wallace D.; Ren, Zhifeng; Salvador, James R.; Sharp, Jeff; Taylor, Patrick J.; Thompson, Alan; Tseng, Yu‐Chih

doi:10.1007/s11664-015-4006-z

Cited by 54 publications

(41 citation statements)

References 41 publications

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“…We measured the samples numerous times while they were heated up to 600

^{\circ}

C and cooled and verified that there was no degradation in the various sample properties. The above-mentioned uncertainties are derived from these multiple measurements and are in good agreement with the international round-robin study of the thermoelectric transport properties of an n -type half-Heusler compound conducted by eleven laboratories throughout the world [29]. …”

Section: Methodssupporting

confidence: 76%

On the Phase Separation in n-Type Thermoelectric Half-Heusler Materials

Schwall

Balke

2018

Materials

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Half-Heusler compounds have been in focus as potential materials for thermoelectric energy conversion in the mid-temperature range, e.g., as in automotive or industrial waste heat recovery, for more than ten years now. Because of their mechanical and thermal stability, these compounds are advantageous for common thermoelectric materials such as Bi2Te3, SiGe, clathrates or filled skutterudites. A further advantage lies in the tunability of Heusler compounds, allowing one to avoid expensive and toxic elements. Half-Heusler compounds usually exhibit a high electrical conductivity σ, resulting in high power factors. The main drawback of half-Heusler compounds is their high lattice thermal conductivity. Here, we present a detailed study of the phase separation in an n-type Heusler materials system, showing that the TixZryHfzNiSn system is not a solid solution. We also show that this phase separation is key to the thermoelectric high efficiency of n-type Heusler materials. These results strongly underline the importance of phase separation as a powerful tool for designing highly efficient materials for thermoelectric applications that fulfill the industrial demands of a thermoelectric converter.

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“…We measured the samples numerous times while they were heated up to 600

^{\circ}

Section: Methodssupporting

confidence: 76%

On the Phase Separation in n-Type Thermoelectric Half-Heusler Materials

Schwall

Balke

2018

Materials

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“…In recent years, significant improvements in material ZT have been realized in nanostructured materials [9][10][11][12][13][14]. Nanostructured bulk half-Heusler alloys are of particular interest for automotive waste heat recovery applications due to their high peak ZT (1.0 for n-type and 0.9 for ptype) at temperatures around 500°C [15][16][17][18][19][20], which is close to typical automotive exhaust temperatures. A TEG constructed with these materials produced over 1 kW of electricity from the exhaust waste heat of a diesel engine [21], affirming the potential of the half-Heusler materials for automotive waste heat recovery.…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of automotive thermoelectric generators for maximum fuel efficiency improvement

Kempf

Zhang

2016

Energy Conversion and Management

101

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a b s t r a c tAutomotive fuel efficiency can be increased by thermoelectric power generation using exhaust waste heat. A high-temperature thermoelectric generator (TEG) that converts engine exhaust waste heat into electricity is simulated based on a light-duty passenger vehicle with a 4-cylinder gasoline engine. Strategies to optimize TEG configuration and heat exchanger design for maximum fuel efficiency improvement are provided. Through comparison of stainless steel and silicon carbide heat exchangers, it is found that both the optimal TEG design and the maximum fuel efficiency increase are highly dependent on the thermal conductivity of the heat exchanger material. Significantly higher fuel efficiency increase can be obtained using silicon carbide heat exchangers at taller fins and a longer TEG along the exhaust flow direction when compared to stainless steel heat exchangers. Accounting for major parasitic losses, a maximum fuel efficiency increase of 2.5% is achievable using newly developed nanostructured bulk half-Heusler thermoelectric modules.

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“…(2). This method however proves quite inaccurate without great experimental care as each measurement error for each parameter contributes to the cumulated global error on the resulting value of ZT [12,13,14,15]. To Recently, the Harman technique has been further improved using impedance spectroscopy analysis to lower uncertainties on ZT [19].…”

Section: Introductionmentioning

confidence: 99%

Small-signal model for frequency analysis of thermoelectric systems

Apertet

Ouerdane

2017

Energy Conversion and Management

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We show how small-signal analysis, a standard method in electrical engineering, may be applied to thermoelectric device performance measurement by extending a dc model to the dynamical regime. We thus provide a physical ground to \textit{ad-hoc} models used to interpret impedance spectroscopy of thermoelectric elements from an electrical circuit equivalent for thermoelectric systems in the frequency domain. We particularly stress the importance of the finite thermal impedance of the thermal contacts between the thermoelectric system and the thermal reservoirs in the derivation of such models. The expression for the characteristic angular frequency of the thermoelectric system we obtain is a generalization of the expressions derived in previous studies. In particular, it allows to envisage impedance spectroscopy measurements beyond the restrictive case of adiabatic boundary conditions often difficult to achieve experimentally, and hence \emph{in-situ} characterization of thermoelectric generators

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International Round-Robin Study of the Thermoelectric Transport Properties of an n-Type Half-Heusler Compound from 300 K to 773 K

Cited by 54 publications

References 41 publications

On the Phase Separation in n-Type Thermoelectric Half-Heusler Materials

On the Phase Separation in n-Type Thermoelectric Half-Heusler Materials

Design and optimization of automotive thermoelectric generators for maximum fuel efficiency improvement

Small-signal model for frequency analysis of thermoelectric systems

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