Hexagonal perovskite Sr₆(Co_0.8Fe_0.2)₅O₁₅ as an efficient electrocatalyst towards the oxygen evolution reaction

Abstract

The high overpotential required for the oxygen evolution reaction (OER)—due to the transfer of four protons and four electrons—has greatly hindered the commercial viability of water electrolysis. People have been...

Recent Advances on Perovskite Electrocatalysts for Water Oxidation in Alkaline Medium

“…Therefore, it is a very important task to synthesize perovskite oxides with specific structural features, including element composition, structure, morphology, crystal phase, and surface defect. In order to achieve the precise control of perovskite element composition, structure, morphology, crystal phase, and surface defects, the synthesis methods of sol–gel, solid phase synthesis, hydrothermal synthesis, and coprecipitation have been used. ,− We also summarize the advantages and disadvantages of the synthesis methods for perovskite oxides (Table ).…”

“…In recent years, crystal phase engineering has made great achievements in the field of the OER. ,, At the same time, the unusual phase of materials with different atomic arrangements from the thermodynamically stable phase has attracted great attention. The change of the crystal phase corresponds to the change of the arrangement of atoms in the crystal structure and exhibits different conductivity and activity units, as well as determines its electronic structure and coordination structure.…”

“…With the development of the perovskite-based OER catalytic materials, researchers have found that the OER catalytic performance of perovskite mainly relies on the catalyst surface’s adsorption strength of oxygen-containing intermediates through the adsorbate evolution mechanism (AEM). − In addition, many researchers also have illustrated that the catalytic activity of perovskite is determined by its e g orbital filling degree, transition metal 3d band center, and O 2p band center. − Based on the above theoretical guidance, several strategies of activity improvement have been successfully developed to design ideal perovskite-based OER catalysts, such as doping, morphology engineering, introducing vacancy, crystal phase engineering, surface reconstruction, and constructing hybrid-structure. − …”

Iridium‐Doped 10H‐Phase Perovskite BaCo0.8Fe0.15Ir0.05O3–δ as an Efficient Oxygen Evolution Reaction Catalyst

“…In order to improve the efficiency of energy conversion in practical applications, a series of OER catalysts have been studied to reduce the reaction energy barrier and improve the reaction rate. Common materials include single metal oxides, [ 5 ] spinel oxides, [ 6 ] perovskite oxides [ 7‐10 ] and hydroxides, [ 11‐12 ] etc . Perovskite, refers to a class of ceramic oxides with the general formula ABO 3 .…”

Facile Synthesis and Origin of Enhanced Electrochemical Oxygen Evolution Reaction Performance of 2H-Hexagonal Ba2CoMnO6−δ as a New Member in Double Perovskite Oxides

“…The key difference between the cubic and hexagonal structures is that B cations are only connected to corner-sharing points in the cubic structure, while in the hexagonal structure they are connected to face-sharing octahedral sites. Theoretical calculations showed that face-sharing octahedral sites play a vital role in the high OER activity of hexagonal perovskite oxides over cubic ones. − Moreover, the ionic size of Ba is greater than that of Sr 2+ and La 3+ , and it has been reported that increasing the size of the A-site cation would increase the O–M bond angle leading to an increase in the electrical conductivity …”