Impacts of A-site gadolinium doping on electrocatalytic performance of La0.33Ba0.62Gd0.05Co0.7Fe0.3O3- to realize promising cathode for intermediate-temperature solid oxide fuel cells

Advancing Solid Oxide Fuel Cell Performance: Enhanced Electrochemical Properties of Pr1–xCaxBaFe2O5+δ Nanofiber Cathodes via Ca Doping

“…Nevertheless, there are multiple stages involved in the electrochemical processes at the cathode, some of which may co-occur or disperse in the frequency domain, resulting in a reduced resolution of the EIS curve . To tackle this problem, the relaxation time distribution (DRT) approach was used. − The DRT curve showed three different peaks that represented the high frequency (HF), intermediate frequency (IF), and low frequency (LF) areas, respectively, as depicted in Figure b. The fitting of the corresponding equivalent circuit was established based on the DRT analysis results.…”

Evaluation of LnCaCoO4+δ as Potential Cathode Materials for Solid Oxide Fuel Cells

“…Clearly it can be deconvoluted into four peaks, indicating a mixed valence state of Co ions in the sample. The binding energy at 779.8 eV/794.6 eV is allocated to Co 3+ , and the binding energy at 780.8 eV/795.8 eV is due to Co 4+ . , The high oxidizing Co 4+ on the surface of the catalyst may be beneficial for oxygen adsorption due to the strong electrostatic affinity of high-valence, positively charged cations, thereby beneficial to the progress of ORR reaction …”

“…27,28 The high oxidizing Co 4+ on the surface of the catalyst may be beneficial for oxygen adsorption due to the strong electrostatic affinity of highvalence, positively charged cations, thereby beneficial to the progress of ORR reaction. 29 Table 3 lists the percentages of Co with different valence states. It was found that the percentage of Co 4+ increases gradually, when the rare-earth element changes from Sm to Pr, with PrCCO showing the highest average valence states of Co ions among these LnCCO.…”

“…The binding energy at 779.8 eV/ 794.6 eV is allocated to Co 3+ , and the binding energy at 780.8 eV/795.8 eV is due to Co 4+ 27,28. The high oxidizing Co 4+ on the surface of the catalyst may be beneficial for oxygen adsorption due to the strong electrostatic affinity of highvalence, positively charged cations, thereby beneficial to the progress of ORR reaction 29. Table3lists the percentages of Co with different valence states.…”