Recent Research on Iridium‐Based Electrocatalysts for Acidic Oxygen Evolution Reaction from the Origin of Reaction Mechanism

Small, Journal Year: 2024, Volume and Issue: 20(43)

Published: June 28, 2024

As the anode reaction of proton exchange membrane water electrolysis (PEMWE), acidic oxygen evolution (OER) is one main obstacles to practical application PEMWE due its sluggish four-electron transfer process. The development high-performance OER electrocatalysts has become key improving kinetics. To date, although various excellent have been widely researched, Ir-based nanomaterials are still state-of-the-art electrocatalysts. Hence, a comprehensive and in-depth understanding mechanism crucial for precise optimization catalytic performance. In this review, origin nature conventional adsorbate (AEM) derived volcanic relationship on processes summarized some strategies based AEM introduced. further investigate strategy electrocatalysts, several unconventional mechanisms including dual-site lattice mediated mechanism, their applications introduced in detail. Thereafter, active species at classified into surface Ir O species. Finally, future direction prospect put forward.

Language: Английский

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Rare Earth‐Induced CoO₆ Octahedral Distortion in Perovskite: An Efficient Catalytic Platform for RuO₂‐Catalyzed Water Oxidation

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 22, 2024

Abstract Rare earth (RE)‐based perovskites are considered as promising platform for oxygen evolution reaction (OER) due to their low cost and tunable structures. However, the systematic synthesis of perovskite catalysts with satisfactory performance has rarely been reported. Herein, a general synthetic protocol RE‐substituted LaCoO 3 (RE‐LCO) is demonstrated. Particularly, after loaded RuO 2 , as‐prepared :0.2Ce‐LCO hybrid structures exhibit OER overpotential 135 mV at 10 mA cm −2 in 1.0 m KOH, together remarkable long‐term operation, representing one most efficient robust Ru‐based catalysts. Comprehensive experimental results indicate that enhanced mechanism attributed Ce‐substitution, which alters geometric configuration CoO 6 octahedra generates more vacancies. Furthermore, interaction between Ce‐LCO stabilizes valence state Ru site. Theoretical calculations corroborate Co 3d orbitals overlap Ce 4f near Fermi level, greatly improving electron transfer atoms.

Language: Английский

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Progress of Ir/Ru-based catalysts for electrocatalytic oxygen evolution reaction in acidic environments

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 92, P. 657 - 671

Published: Oct. 30, 2024

Language: Английский

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Lanthanides in the water electrolysis

EcoMat, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 12, 2024

Abstract The most feasible technique for producing green hydrogen is water electrolysis. In recent years, there has been significant study conducted on the use of transition metal compounds as electrocatalysts both anodes and cathodes. Peoples have attempted several strategies to improve electrocatalytic activity their original structure. One such involves introducing rare earth metals or creating heterostructures with based metals. incorporation significantly enhances by many folds, while offer structural stability ability manipulate electronic properties system. These factors led a boom in investigations metal‐based electrocatalysts. There currently pressing demand review article that can provide comprehensive overview scientific advancements elucidate mechanistic aspects impact lanthanide doping. This begins explaining structure lanthanides. We next examine aspects, followed doping heterostructure formation electrolysis applications. It expected this particular effort will benefit broad audience stimulate more research area interest. image

Language: Английский

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Design of Electrocatalysts with High Performance Based on Thermodynamics and Kinetics: Progress and Prospects

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 15, 2024

Abstract Efficient and robust electrocatalysts play a central role in clean energy conversion, enabling number of sustainable processes for future technologies. The traditional explorations electrocatalyst relying on the trial‐and‐error approaches are definitely tedious inefficient. Theoretical progresses reactive thermodynamics kinetics recent years have initiated powerful theory‐guided design strategy electrocatalysts. Herein, this review first summarizes principles activity stability, presenting thermodynamics, kinetics, synergistic thermokinetic correlation electrocatalytic reaction. Second, screening criterion, reasonable design, mechanistic understanding, performance evaluation typical as divided into oriented‐, oriented‐designs discussed. necessity correlating rational mechanism clarification is highlighted. Finally, conclusions perspectives development highly efficient proposed.

Language: Английский

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Optimizing the electronic structure of Ru catalyst through heterogeneous interfaces for long-term alkaline oxygen evolution under industrial current density

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 106, P. 528 - 536

Published: Feb. 5, 2025

Language: Английский

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First-principles study of oxygen evolution reaction on CeNi-doping Co3O4(110)

Molecular Catalysis, Journal Year: 2025, Volume and Issue: 576, P. 114921 - 114921

Published: Feb. 20, 2025

Language: Английский

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Low‐Ir‐Content Ir_0.10Mn_0.90O₂ Solid Solution for Highly Active Oxygen Evolution in Acid Media

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 3, 2025

Iridium (Ir)-based materials are the most widely used oxygen evolution reaction (OER) electrocatalysts in proton exchange membrane water electrolysis (PEMWE). However, their commercial application suffers from high cost and insufficient activity. To optimize atom utilization efficiency of Ir, aim is to engineer develop a rutile-structured solid solution catalyst with minimal Ir content, which identified through phase boundary. Here, Ir0.10Mn0.90O2 represents lowest content desired IrO2-MnO2 solution. The exhibits outstanding OER performance acidic electrolytes, reaching remarkable mass activity 1135 A g-1 at an overpotential 300 mV, ≈50 times higher than that IrO2 catalyst. Additionally, it demonstrates excellent stability current density 200 mA cm-2 over 120 h during PEMWE operations. Density functional theory (DFT) calculations indicate hydroxylation process can be efficiently promoted by electron-withdrawing on sites Ir0.10Mn0.90O2, contributing enhancement

Language: Английский

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Tungsten Defect‐Induced Surface Reconstruction of Ce₂W₂O₉ Arrays for Enhanced Oxygen Evolution Reaction Performance

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 7, 2025

Abstract Cerium oxide has emerged as a crucial promoter for regulating the electrocatalytic oxygen evolution reaction (OER) performance of other active components; however, mechanism underlying its intrinsic activity remains poorly understood. Herein, novel self‐supported coral‐like Ce 2 W O 9 array is synthesized on carbon cloth using simple ion‐exchange method. The in situ electrochemical surface reconstruction facilitated formation defects, which effectively altered local bonding environment atoms. Based advanced characterization techniques and theoretical calculations, it concluded that optimized centers served sites, substantially reducing energy barrier potential‐determining step ( * OOH formation), turn, facilitating generation boosting activity. Consequently, reconstructed electrode exhibited an exceptionally low overpotential 351 mV at 100 mA cm −2 1 m KOH, while maintaining remarkable stability over 000 h 20 . This study provides valuable insights into mechanistic understanding strategic design rare‐earth oxide‐based electrocatalysts.

Language: Английский

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Single-Atom Electrocatalysts for Water Splitting in Acidic Media

ACS Sustainable Chemistry & Engineering, Journal Year: 2024, Volume and Issue: 12(42), P. 15307 - 15343

Published: Oct. 11, 2024

The proton exchange membrane water electrolyzer (PEMWE) is regarded as the most promising technique to convert intermittent renewable energy sources into clean and storable hydrogen through electrocatalytic splitting. However, commercial electrocatalysts for evolution reaction (HER) oxygen (OER) are based on expensive platinum group metals (PGMs), which predominantly hinder large-scale application of PEMWE. Single-atom (SAECs) with atomic level dispersion metal active sites can greatly minimize usage amount precious while keeping efficient activities. These advantages make SAECs attractive their in In this review, mechanism HER OER, together general synthesis strategies SAECs, was introduced discussed. Subsequently, recent development (non)precious acidic HER, overall splitting summarized, highlighted understanding between electronic structure performance. Finally, challenges perspectives proposed.

Language: Английский

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