Publication date: 10th April 2024
The efficiency of solid oxide fuel cells is significantly influenced by the rate of the oxygen reduction reaction (ORR) occurring at the cathode[1]. Addressing this challenge, alongside the development of entirely new materials, involves the chemical doping of pre-existing old material. In this context, doped BaCoO3-δ (BCO) perovskites have gained attention as versatile electrocatalysts at lower operating temperatures, surpassing the limitation of conventional material such as SrCoO3-δ based perovskites[2]. However, the role of dopants remains ambiguous and requires further investigation.
Here, we present a comprehensive study involving various dopants to understand cubic stabilization, focusing on the formation of mobile oxygen vacancies and oxygen adsorption on the cobaltite perovskite. The transition from a hexagonal to cubic structure not only promotes the formation of abundant mobile oxygen vacancies but also enhances the oxygen adsorption on the surface, which markedly facilitate the oxygen reduction reaction. Once stabilized into the defective cubic structure, the electrochemical activity was determined by the type of dopant. Interestingly, donor-doped BCO stands out as the most promising candidate among those considered particularly at the relatively high temperature, striking a delicate balance between a high concentration of oxygen vacancies and resulting phase instability. This differs significantly from conventional high-performance ORR electrocatalyst design strategies.
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