Publication date: 10th April 2024
Hydrogen has emerged in recent years as a source of clean energy production as long as it is not produced with the emission of carbon dioxide. One of the most promising options is the use of electrolyzers in combination with renewable electricity sources to produce hydrogen cleanly. However, the efficiency is still low, and the development of new materials is necessary to make these devices competitive.
The objective of this work is to characterize the SrFe1-xSbxO3-δ solid solution in order to design a functional material for use as an air electrode in solid oxide electrolyzers for the production of green hydrogen.
SrFe1-xSbxO3-δ perovskites-like materials (x = 0.05-0.20) were prepared by solid-state route in air at 1350°C. XRD results showed the formation of single-phase samples with tetragonal structure for the compositions range x = 0.05-0.10, whereas higher antimony contents (x ≥ 0.15) produce single-phase samples with cubic symmetry. The characterization of materials included microstructural studies (SEM/EDS), measurements of the Area of Specific Resistance (ASR) of a 30-70wt% of CGO-material composite in air, electrical conductivity as function of temperature at different oxygen partial pressures, determination of oxygen content, compositional analysis by XPS and structural characterization by SAED and HREM. Initially, for x = 0.05 to 0.10, ASR values (Figure 1) increase with Sb content. However, for higher Sb content (x ≥ 0.15) lower polarization resistances are obtained. Notably, for x = 0.2 the ASR value at 700°C is as low as 0.32 Ω cm2 which is competitive for real devices
This research has been supported by the "Plan de Recuperación, Transformación y Resiliencia-C17.I1", with funds from the European Union - Next Generation EU, “European Regional Development Fund” as part of the action after the COVID-19 pandemic, and Comunidad de Madrid for the project "(GREEN H2-CM).
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