Making High Thermoelectric and Superior Mechanical Performance Nb_0.88Hf_0.12FeSb Half-Heusler via Additive Manufacturing.

ABSTRACT: Thermoelectric generators held great promise through energy harvesting from waste heat. Their practical application, however, is greatly constrained by poor raw material utilization and tedious processing in fabricating desired shapes. Herein, a state-of-the-art process is reported for 3D printing the half-Heusler (Nb_0.88Hf_0.12FeSb) thermoelectric material using laser powder bed fusion (LPBF). The multi-dimensional intra- and inter-granular defects created by this process greatly suppress thermal conductivity by providing numerous phonon scattering centers. The resulting LPBF-fabricated half-Heusler exhibits a high figure of merit ≈1.2 at 923 K and a single-leg maximum efficiency of ≈3.3% at a temperature difference (ΔT) of 371 K. Hafnium oxide nanoparticles generated

SUBMITTER: Yao Z 

PROVIDER: S-EPMC11538669 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature