Role of strontium as doping agent in LaMn0.5Ni0.5O3 for oxygen electro-catalysis

Mobinul Islam; Min-Gi Jeong; In-Hwan Oh; Kyung-Wan Nam; Hun-Gi Jung

Journal of Industrial and Engineering Chemistry, Vol.85, 94-101, May, 2020

DOI10.1016/j.jiec.2020.01.026 Export Citation

Role of strontium as doping agent in LaMn0.5Ni0.5O3 for oxygen electro-catalysis

Mobinul Islam¹, Min-Gi Jeong², In-Hwan Oh², Kyung-Wan Nam¹, and Hun-Gi Jung^{2, 3, †}

¹Department of Energy and Materials Engineering, Dongguk University-Seoul, 04620, Republic of Korea
²Center for Energy Storage Research, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
³Division of Energy and Environment Technology, Korea University of Science and Technology, Daejeon, 34113, Republic of Korea

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Doping is an effective way to trigger various behaviors in ceramics. LaMn0.5Ni0.5O3 perovskites with or without strontium (Sr) doping were prepared using a sol-gel process and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy (SEM), and Brunauer. Emmett.Teller (BET) gas adsorption techniques. A structural transition in the LaMn0.5Ni0.5O3 perovskite was observed upon doping, suggesting its pinning effect on the crystal structure. The SEM and BET results showed that the incorporation of Sr2+ into this oxide material markedly decreased the particle size into the nanoscale range and increased the active surface area. The oxide electrocatalytic properties toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in an alkaline medium were measured using a rotating disk electrode. The results revealed that La0.8Sr0.2Ni0.5Mn0.5O3 is a more active catalyst than LaNi0.5Mn0.5O3 for the ORR and OER. The improved electrocatalytic performance of the Sr- doped oxide is related to the increase in ORR/OER current density and the positive shift in the ORR onset potential compared with that of the LaNi0.5Mn0.5O3 catalyst. The overall electron transfer number was measured as approximately 4. The basis of this enhanced performance is discussed in terms of the material electronic structure and morphology.

Keywords:Perovskite oxide;Oxygen evolution reaction;Oxygen reduction reaction;Strontium doping;Rotating disk electrode

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