Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.270
Publication date: 22nd December 2022
Oxygen reduction reaction activity is governed by the oxygen adsorption/dissociation, proton conduction, and electron transfer kinetics in protonic ceramic fuel cells (PCFCs). Various strategies have been explored to enhance the proton and electron conductivity via tuning oxygen vacancy concentration in the electrode materials and introducing electronic conducting agents. However, there are few studies on improving surface exchange reaction (oxygen adsorption/dissociation) kinetics in protonic ceramic fuel cells. In this study, we report uniformly distributed nickel oxide (NiO) nanoparticles as a catalyst to enhance the electrochemical performance of BaCo0.4Fe0.4Zr0.1Y0.1O3-δ-BaZr0.1Ce0.7Y0.1Yb0.1O3 (BCFZY-BZCYYb) composite cathode by improving surface exchange reaction kinetics. The 0D NiO nanoparticles with high adsorption and fast dissociation ability of oxygen could enlarge the active sites for surface exchange reaction without fading the BCFZY surface and triple-phase boundaries where H2O formation reaction occurs. The cathode employing NiO nanoparticles exhibits largely reduced polarization resistance and superior power density of 780 mW/cm2 at 600 °C. In addition, the water-stable characteristic of NiO and reduced polarization resistance of composite cathode drastically improved the cell stability.
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