The effect of particle size on structural and catalysts for oxygen evolution reaction of (CoFeNiMnCr)O prepared by controlled synthesis with polyvinylpyrrolidone (PVP).

In this study, high-entropy spinel oxides (CoNiMnFeCr)O were synthesized using a PVP-assisted sol-gel method, marking the first report of this approach for producing high-entropy oxides. This method provides new insights into morphology customization through precise temperature control during calcination. Samples were calcined at 800, 900, and 1000 °C, and structural, optical, and electrochemical characterizations were performed to evaluate the impact of synthesis conditions on the oxygen evolution reaction (OER) performance.

Enhancing oxygen reaction kinetics in lanthanum nickelate Ruddlesden-Popper electrodes praseodymium oxide infiltration for solid oxide cells.

This study explores the effect of praseodymium oxide (PrO) impregnation in lanthanum nickelate Ruddlesden-Popper (RP) type materials for use in oxygen electrodes of solid oxide cells (SOCs). These mixed conductors are free of cobalt and strontium, which are increasingly being avoided in solid oxide cell applications. We investigate two compositions, LaNiO (L2N1) and LaNiO (L4N3), demonstrating distinct electrical and oxygen kinetic properties.

Nanoparticles of Mixed-Valence Oxides MnCOO (0 ≤ X ≤ 1) Obtained with Agar-Agar from Red Algae (Rhodophyta) for Oxygen Evolution Reaction.

The development of efficient electrocatalysts for the oxygen evolution reaction (OER) is of paramount importance in sustainable water-splitting technology for hydrogen production. In this context, this work reports mixed-valence oxide samples of the MnCoO type (0 ≤ X ≤ 1) synthesized for the first time by the proteic sol-gel method using Agar-Agar as a polymerizing agent. The powders were calcined at 1173 K, characterized by FESEM, XRD, RAMAN, UV-Vis, FT-IR, VSM, and XPS analyses, and were investigated as electrocatalysts for the oxygen evolution reaction (OER).