Power factor improvement in a solid–liquid thermoelectric system formed by Sb:SnO₂ in contact with a chromium complex solution

Castro-Ruiz, S. ; Márquez-García, L. ; Solis-de la Fuente, M. ; Beltrán-Pitarch, B. ; Mota-Babiloni, A. ; Vidan, F. ; Íñigo-Rabinal, P. ; Guisado-Barrios, G. ; García-Cañadas, J.

Resumen: Thermoelectric (TE) materials can convert heat into electricity. Good TE materials should have high power factors (PF) and low thermal conductivities. PF = S2σ is governed by the Seebeck coefficient S and the electrical conductivity σ. Most recent improvements in TE materials performance have been achieved by the reduction of the thermal conductivity, and strategies to improve the PF have been minor. Recently, an innovative concept to significantly increase the PF, based on the combination of a porous TE solid with an electrolyte, has been reported. Here, we make use of this new approach but using an electroactive salt (redox molecule) solution as electrolyte, rather than the non-electroactive electrolytes and ionic liquids previously employed. A system formed by a nanostructured and porous Sb:SnO2 film in contact with Cr(III) acetylacetonate dissolved in 3-methoxypropionitrile was prepared. Using this electrolyte, an average PF enhancement of 3.4 times was achieved, due to an average decrease of 23.2% and 82.8% in the absolute value of the Seebeck coefficient and the electrical resistivity of the solid, respectively. An impedance spectroscopy analysis, after checking by scanning electron microscopy and energy-dispersive X-ray spectroscopy that no changes take place in the Sb:SnO2 film due to the presence of electrolytes, revealed that the improvements come from the donation of electrons from the electrolyte to the solid, which increases its electrical conductivity and the usual drop in the Seebeck coefficient. The remarkable PF improvement obtained is among the highest reported and opens a new way of significantly enhancing this parameter.

Idioma: Inglés

DOI: 10.1039/d3se00622k

Año: 2023

Publicado en: Sustainable Energy & Fuels 7, 17 (2023), 4254-4259
ISSN: 2398-4902

Factor impacto JCR: 5.0 (2023)

Categ. JCR: CHEMISTRY, PHYSICAL rank: 61 / 178 = 0.343 (2023) - Q2 - T2
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 131 / 439 = 0.298 (2023) - Q2 - T1
Categ. JCR: ENERGY & FUELS rank: 71 / 171 = 0.415 (2023) - Q2 - T2

Factor impacto CITESCORE: 10.0 - Renewable Energy, Sustainability and the Environment (Q1) - Fuel Technology (Q1) - Energy Engineering and Power Technology (Q1)

Factor impacto SCIMAGO: 1.213 - Energy Engineering and Power Technology (Q1) - Fuel Technology (Q1) - Renewable Energy, Sustainability and the Environment (Q2)

Financiación: info:eu-repo/grantAgreement/ES/AEI/PID2021-122900NB-I00
Financiación: info:eu-repo/grantAgreement/ES/DGA/E50-20D
Financiación: info:eu-repo/grantAgreement/EC/H2020/863222/EU/Solid-liquid thermoelectric systems with uncorrelated properties/UncorrelaTEd
Financiación: info:eu-repo/grantAgreement/ES/RYC2019-026693-I/AEI/10.13039/501100011033

Tipo y forma: Article (Published version)