Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 38, Pages 45708-45716Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c11263
Keywords
thermoelectric; stability; zinc antimonide; Zn4Sb3; operando; working conditions
Funding
- Villum Foundation
Ask authors/readers for more resources
The addition of TiO2 nanoparticles in pressed pellets of beta-Zn4Sb3 does not prevent zinc migration, although it does affect thermal conductivity and electrical resistivity. However, the overall zT remains unchanged. The inclusion of TiO2 nanoparticles lowers the degradation rate by up to 75%, but long-term stability is not achieved.
beta-Zn4Sb3 is a cheap nontoxic high-performance thermoelectric material, which unfortunately suffers from stability issues because of zinc migration in thermal and electrical gradients. Here, the thermoelectric properties and thermal stability of beta-Zn4Sb3 mixed with varying sizes and weight percentages of TiO2 nanoparticles are investigated. Furthermore, the stability of pressed beta-Zn4Sb3-TiO2 nanocomposite pellets is investigated by measuring high-energy synchrotron powder X-ray diffraction (PXRD) data during operating conditions using the Aarhus thermoelectric operando setup (ATOS). Through these studies, it is determined that TiO2 nanoparticle addition in pressed pellets of beta-Zn4Sb3 does not prevent Zn migration, and even though effects are seen in the thermal conductivity and electrical resistivity, the overall zT remains unchanged regardless of TiO2 nanoinclusions. For the present samples, the Seebeck coefficients are unaffected by the addition of nanoparticles, and thus, there is no observed energy-filtering effect. The operando PXRD data reveal that the TiO2 nanoinclusions lower the degradation rate by up to 75%, but all samples eventually decompose. This is corroborated by long-term stability tests performed using a thermal gradient. In conclusion, TiO2 nanoinclusions do not degrade the excellent thermoelectric properties of beta-Zn4Sb3, but the stabilizing effect is not sufficient for establishing long-term operating stability.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available