Ruddlesden–Popper Oxides LaSrM 1 1− x M 2 x O 4±δ (M 1, M 2 —Fe, Co, Ni) Synthesized by the Spray-Pyrolysis Method as Promising Electrocatalysts for Oxygen Evolution Reaction

Pavel A. Sinitsyn (), Vitaly V. Kuznetsov (), Elena A. Filatova and Sergey V. Levchenko
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Pavel A. Sinitsyn: Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Moscow 121205, Russia
Vitaly V. Kuznetsov: Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Moscow 121205, Russia
Elena A. Filatova: Department of General and Inorganic Chemistry, Mendeleev University of Chemical Technology of Russia, Moscow 125047, Russia
Sergey V. Levchenko: Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Moscow 121205, Russia

Energies, 2022, vol. 15, issue 21, 1-13

Abstract: Ruddlesden–Popper (RP) transition-metal oxide phases with the general formula A n +1 B n O 3 n +1 are versatile functional materials that can accommodate a large variety of compositions without compromising structural stability. Substitutions at the A and B sites allow for the precise control of functional properties of these materials. This opens wide possibilities for rational design. In particular, some of these materials were demonstrated to be efficient and stable catalysts for electrochemical oxygen evolution reaction (OER)—one of the key processes in fuel cells and water electrolyzers. In this work, RP phases LaSrM 1 1− x M 2 x O 4±δ (M 1 , M 2 —Fe, Co, Ni) with unreported stoichiometry are prepared from aqueous solutions of metal nitrates using the ultrasonic spray-pyrolysis (USP) technique. We found that the phase purity of samples synthesized by USP is higher as compared to samples prepared by solid-state synthesis or by precipitation from aqueous solutions followed by calcination, used in previous studies of RP oxides. LaSrFe 0.5 Ni 0.5 O 4– δ (LSNF) oxides are found to be very active in OER in alkaline solutions, with overpotential 0.27 V at j = 0.1 A cm –2 of visible electrode surface in a 5 M solution of KOH. This overpotential is on par with the noble-metal-based OER electrocatalysts. Moreover, the catalytic performance of LSNF in OER is found to be stable over the electrolysis time even in the strongly alkaline solution. These two factors let us conduct the water splitting process in more concentrated electrolytes decreasing the energy cost of hydrogen production by water electrolysis.

Keywords: pure hydrogen production; water splitting; Ruddlesden–Popper phases; oxygen evolution reaction; electrocatalysis; ultrasonic spray-pyrolysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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