Electrocatalytic Properties of Cuprous Delafossite Oxides for the Alkaline Oxygen Reduction Reaction

Abstract

Inspired by the oxygen‐binding copper sites in biomolecules, a series of cuprous delafossite oxides (CuBO2; B=Sc, Y, La) with similar interatomic copper distances were utilized as electrocatalysts for the oxygen reduction reaction (ORR). The carbon‐supported oxides showed improved onset potential, current, and electron‐transfer number over carbon black, with CuLaO2 having the highest prevalence of the complete four‐electron reduction. The oxygen electrocatalytic activity of the copper site in delafossite oxides was demonstrated.

Earth‐Abundant Alkali Iron Phosphates (AFePO4) as Efficient Electrocatalysts for the Oxygen Reduction Reaction in Alkaline Solution

“…where n is the number of electrons transferred, F is the Faraday constant, D is the diffusion coefficient of O 2 (1.9×10 −5 cm 2 s −1 ), ω is the electrode rotation rate, v is the kinematic viscosity of water (0.01 cm 2 s −1 ), and C is the concentration of O 2 in 0.1 m KOH aqueous solution (1.2×10 −6 mol cm −3 ) . The LSV curves were recorded at different rpm (400–1600 rpm) and the corresponding K–L plots as slopping lines in general gives us an electron transfer number.…”

“…It has provided the impetus for worldwide research revolving around energy over the past two decades . Robust electrochemical energy conversion processes form a key segment for the fruitful execution of sustainable energy sources . In the case of electrocatalysis, there exists significant performance differences between transition metal oxides and platinum‐based noble metal catalysts.…”

MOF-Derived 2D/3D Hierarchical N-Doped Graphene as Support for Advanced Pt Utilization in Ethanol Fuel Cell

“…Fuel cell powered by ethanol is promising as the next-generation clean energy system for its advantages of high energy conversion efficiency, low toxicity, and mass production of ethanol from biomass. − The key to propel fuel cell technology is to develop highly effective and stable electrocatalysts for the anodic ethanol oxidation reaction (EOR) and the cathodic oxygen reduction reaction (ORR). , As a standard catalyst for both the EOR and ORR, platinum (Pt) exhibits good catalytic activity. , However, its scarcity and poor long-term stability trigger great interest in exploring alternative Pt-free catalysts. , Unfortunately, most of the non-Pt catalysts show insufficient activities and low durability in acidic medium, due to low intrinsic activities and electrolyte corrosions. , Accordingly, development of highly efficient catalysts with low Pt dosage has drawn intensive attention …”

“…8,9 Unfortunately, most of the non-Pt catalysts show insufficient activities and low durability in acidic medium, due to low intrinsic activities and electrolyte corrosions. 10,11 Accordingly, development of highly efficient catalysts with low Pt dosage has drawn intensive attention. 12 One way to achieve the goal is to develop highly conductive catalysts with atomically dispersed Pt sites or monodispersed Pt nanoclusters.…”

Phase stability of the layered oxide, Ca2Mn3O8; probing interlayer shearing at high pressure

“…Layered metal oxides continue to attract extensive attention due to their large compositional flexibility and wide variety of potential applications. For example, applications in renewable energy [1][2][3][4][5][6][7] and catalysis [8][9][10] have been reported. The prototypical layered transition metal materials are the delafossite family typified by the formulae ABO 2 (where A is a monovalent cation such as Na + or Cu + and B is a trivalent transition metal such as Fe 3+ or Mn 3+ ).…”