Issue 9, 2023

A giant Nernst power factor and figure-of-merit in polycrystalline NbSb2 for Ettingshausen refrigeration

Abstract

Ettingshausen refrigeration is a promising solid-state refrigeration technology that can be used in exploring the quantum state of matters and superconducting materials, but its development is greatly limited by the lack of high-performance polycrystalline thermomagnetic materials. In this work, we report that the polycrystalline topological semimetal NbSb2 has a giant Nernst power factor ((PF)N) of 1269 × 10−4 W m−1 K−2 under 9 T at 28 K and a Nernst figure-of-merit (zN) of 28.5 × 10−4 K−1 under 9 T at 18 K, both of which are record-high values among the polycrystalline thermomagnetic materials. The observed high thermomagnetic performance is mainly attributed to the large and unsaturated Nernst thermopower under a high magnetic field. Due to the diminished anisotropy, the polycrystalline NbSb2 has similar high carrier mobility to the single-crystalline NbSb2 in the bc-plane, yielding large Nernst thermopower in low temperature ranges. Combining the excellent thermomagnetic performance and low-cost and time-saving fabrication process, polycrystalline NbSb2 is a very competitive candidate material for Ettingshausen refrigeration.

Graphical abstract: A giant Nernst power factor and figure-of-merit in polycrystalline NbSb2 for Ettingshausen refrigeration

Supplementary files

Article information

Article type
Communication
Submitted
08 May 2023
Accepted
31 Jul 2023
First published
02 Aug 2023
This article is Open Access
Creative Commons BY-NC license

Energy Environ. Sci., 2023,16, 3753-3759

A giant Nernst power factor and figure-of-merit in polycrystalline NbSb2 for Ettingshausen refrigeration

P. Li, P. Qiu, J. Xiao, T. Deng, L. Chen and X. Shi, Energy Environ. Sci., 2023, 16, 3753 DOI: 10.1039/D3EE01450A

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