Paweł Ziółkowski

High-entropy Fe$_2$VAl-based thermoelectric modules with improved conversion efficiency

Michael Parzer, Geoffrey Roy, Fabian Garmroudi, Paweł Ziółkowski et autres

Thermoelectric (TE) materials enable the direct conversion of heat into electricity and are attractive for sustainable energy applications. For practical deployment, TE materials must combine high efficiency with low cost, non-toxicity, and scalability. In this work, we optimize the TE performance of …

Performance improvement of radioisotope thermoelectric generators (RTGs) by design optimization

Stylianos Kyrimis, Eliott Lallemand, Christian Stiewe, Paweł Ziółkowski et autres

Lunar exploration requires a continuous supply of electrical power, independent of solar irradiation availability. This can be provided by Radioisotope Thermoelectric Generators (RTG) which have been successfully deployed in various deep-space missions, proving their reliability and longevity. Design and operation of an …

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Enhancing finned-phase change material performance for improved solar photovoltaic panel efficiency

Abdeldjalil Belazreg, Naef A.A. Qasem, Aissa Abderrahmane, Obai Younis et autres

Algérie, sa, pl (code pays fourni par la source)

Asymmetric electronic band alignment and potentially enhanced thermoelectric properties in phase-separated Mg2X (X = Si,Ge,Sn) alloys

Byungki Ryu, Samuel Foster, Eun‐Ae Choi, Sungjin Park et autres

The Mg2X (X = Si, Ge, Sn) based alloy is an eco-friendly thermoelectric material for mid-temperature applications. The Mg2Si1−xSnx and Mg2Ge1−xSnx alloys can be phase-separated into Si(Ge)- and Sn-rich phases during material synthesis, leading to a nanocomposite with locally varying electronic band …

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Oxidation Behavior and Integration into High Power Density Thermoelectric Generators of Commercial Half-Heusler Alloys

Soufiane El Oualid, P. Masschelein, Lionel Aranda, Ghouti Medjahdi et autres

Half-Heusler (HH) alloys are among the best high-temperature thermoelectric (TE) materials able to operate above 700 °C. Here, we report on a detailed experimental study of the oxidation behavior of commercial n - and p -type HH alloys, Hf 0.6 Zr 0.4 …

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Decoupled charge and heat transport in Fe2VAl composite thermoelectrics with topological-insulating grain boundary networks

Fabian Garmroudi, Illia Serhiienko, Michael Parzer, Sanyukta Ghosh et autres

Abstract Decoupling charge and heat transport is essential for optimizing thermoelectric materials. Strategies to inhibit lattice-driven heat transport, however, also compromise carrier mobility, limiting the performance of most thermoelectrics, including Fe 2 VAl Heusler compounds. Here, we demonstrate an innovative approach, which …

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Topological-insulating grain boundary networks for high-performance Fe2VAl thermoelectrics

Fabian Garmroudi, Illia Serhiienko, Michael Parzer, Sanyukta Ghosh et autres

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Decoupled charge and heat transport for high-performance Fe$_2$VAl composite thermoelectrics

Fabian Garmroudi, Illia Serhiienko, Michael Parzer, Sanyukta Ghosh et autres

Decoupling charge and heat transport is essential for optimizing thermoelectric materials. Strategies to inhibit lattice-driven heat transport, however, also compromise carrier mobility, limiting the performance of most thermoelectrics, including Fe$_2$VAl Heusler compounds. Here, we demonstrate an innovative approach, which bypasses this tradeoff: …

Characterization of thermoelectric generator modules: Numerical and analytical study on heat flow determination under transient temperature conditions

J. Ferrer, Eckhard Müller, Paweł Ziółkowski

Thermoelectric generator modules (TEMs) are in common use as power sources for spacecraft. Here, we present the first investigations on a modified characterization approach for TEM with a focus on the heat flow determination under transient temperature boundary conditions with a reference …

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Generation of Large Vortex-Free Superfluid Helium Nanodroplets

Anatoli Ulmer, Andrea Heilrath, Björn Senfftleben, Sean M. O. O’Connell et autres

Superfluid helium nanodroplets are an ideal environment for the formation of metastable, self-organized dopant nanostructures. However, the presence of vortices often hinders their formation. Here, we demonstrate the generation of vortex-free helium nanodroplets and explore the size range in which they can …

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Thermoelectric hotspot cooling using thermally conductive fillers

Sang J. Park, Jun‐Young Park, Ki Mun Bang, Jung Min Lee et autres

kr, de (code pays fourni par la source)

Digital twin of an apparatus for combined thermoelectric measurements

S. Kopatz, Paweł Ziółkowski, Eckhard Müller

A high thermoelectric (TE) figure of merit zT of materials enables a high energy conversion efficiency. The quantity zT is defined by the Seebeck coefficient (S), the electric (σ) and thermal (κ) conductivity, and the absolute temperature (T). In this paper, we …

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