Ru/Ir‐Based Electrocatalysts for Oxygen Evolution Reaction in Acidic Conditions: From Mechanisms, Optimizations to Challenges

Advanced Science, Journal Year: 2024, Volume and Issue: 11(21)

Published: March 19, 2024

Abstract The generation of green hydrogen by water splitting is identified as a key strategic energy technology, and proton exchange membrane electrolysis (PEMWE) one the desirable technologies for converting renewable sources into hydrogen. However, harsh anode environment PEMWE oxygen evolution reaction (OER) involving four‐electron transfer result in large overpotential, which limits overall efficiency production, thus efficient electrocatalysts are needed to overcome high overpotential slow kinetic process. In recent years, noble metal‐based (e.g., Ru/Ir‐based metal/oxide electrocatalysts) have received much attention due their unique catalytic properties, already become dominant acidic OER process applied commercial devices. these still face thorny problem conflicting performance cost. this review, first, metal briefly classified according forms existence, mechanisms outlined. Then, focus on summarizing improvement strategies with respect activity stability over years. Finally, challenges development prospects discussed.

Language: Английский

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Perovskite for Electrocatalytic Oxygen Evolution at Elevated Temperatures

ChemSusChem, Journal Year: 2024, Volume and Issue: 17(15)

Published: March 12, 2024

The development of advanced electrolysis technologies such as anion exchange membrane water electrolyzer (AEMWE) is central to the vision a sustainable energy future. Key realization AEMWE technology lies in exploration low-cost and high-efficient catalysts for facilitating anodic oxygen evolution reaction (OER). Despite tremendous efforts fundamental research, most today's OER works are conducted under room temperature, which deviates significantly with AEMWE's operating temperature (50-80 °C). To bridge this gap, it highly desirable obtain insights into catalytic behavior at elevated temperatures. Herein, using well-known perovskite catalyst Ba

Language: Английский

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Efficient and Stable Proton Exchange Membrane Water Electrolysis Enabled by Stress Optimization

ACS Central Science, Journal Year: 2024, Volume and Issue: unknown

Published: March 21, 2024

Proton exchange membrane water electrolysis (PEMWE) is a promising solution for the conversion and storage of fluctuating renewable energy sources. Although tremendously efficient materials have been developed, commercial PEMWE products still cannot fulfill industrial demands regarding efficiency stability. In this work, we demonstrate that stress distribution, purely mechanical parameter in electrolyzer assembly, plays critical role overall The conventional cell structure, which usually adopts serpentine flow channel (S-FC) to deliver distribute reactants products, resulted highly uneven distribution. Consequently, anode catalyst layer (ACL) under high region was severely deformed, whereas low not as active due poor electrical contact. To address these issues, proposed Ti mesh (TM-FC) with gradient pores reduce inhomogeneity. ACL TM-FC exhibited 27 mV lower voltage initially an 8-fold reduction degradation rate compared S-FC at 2.0 A/cm

Language: Английский

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Designing ternary Co-Ni-Fe layered double hydroxides within a novel 3D cross-flower framework for efficient catalytic performance in oxygen evolution reaction

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 678, P. 924 - 933

Published: Sept. 24, 2024

Language: Английский

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Mn-doped RuO₂ nanocrystals with abundant oxygen vacancies for enhanced oxygen evolution in acidic media

Inorganic Chemistry Frontiers, Journal Year: 2024, Volume and Issue: 11(6), P. 1912 - 1922

Published: Jan. 1, 2024

Synthesizing Mn–RuO 2 -120(NaNO 3 ) with abundant oxygen vacancies using the molten salt method enhances evolution reaction (OER) catalytic performance, demonstrating excellent activity and stability.

Language: Английский

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Recent Advances in Iridium‐based Electrocatalysts for Acidic Electrolyte Oxidation

ChemSusChem, Journal Year: 2024, Volume and Issue: 17(13)

Published: Feb. 16, 2024

Abstract Ongoing research to develop advanced electrocatalysts for the oxygen evolution reaction (OER) is needed address demand efficient energy conversion and carbon‐free sources. In OER process, acidic electrolytes have higher proton concentration faster response than alkaline ones, but their harsh strongly environment requires catalysts with greater corrosion oxidation resistance. At present, iridium oxide (IrO 2 ) its strong stability excellent catalytic performance catalyst of choice anode side commercial PEM electrolysis cells. However, scarcity high cost (Ir) unsatisfactory activity IrO hinder industrial scale application sustainable development technology. This highlights importance further on Ir‐based catalysts. this review, recent advances in are summarized, including fundamental understanding mechanism, insights into catalysts, highly electrocatalysts, common strategies optimizing The future challenges prospects developing effective also discussed.

Language: Английский

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Surface Catalytic Repair for the Efficient Regeneration of Spent Layered Oxide Cathodes

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 24, 2024

Direct recycling is considered to be the next-generation technology for spent lithium-ion batteries due its potential economic benefits and environmental friendliness. For layered oxide cathode materials, an irreversible phase transition a rock-salt structure near particle surface impedes reintercalation of lithium ions, thereby hindering compensation process from fully restoring composition defects repairing failed structures. We introduced transition-metal hydroxide precursor, utilizing catalytic activity produced during annealing convert into that provides fast migration pathways ions. The material repair synthesis processes share same heating program, enabling added precursor undergo topological transformation form targeted oxide. This regenerated exhibits performance superior commercial cathodes maintains 88.4% initial capacity after 1000 cycles in 1.3 Ah pouch cell. Techno-economic analysis highlights advantages over pyrometallurgical hydrometallurgical methods, indicating practical application.

Language: Английский

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Sequential oxygen evolution and decoupled water splitting via electrochemical redox reaction of nickel hydroxides

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Oct. 18, 2024

Alkaline water electrolysis is a promising low-cost strategy for clean and sustainable hydrogen production but largely limited by the sluggish anodic oxygen evolution reaction challenges in maintaining adequate separation between H2 O2. Here, we reveal an anodic-cathodic sequential process via electrochemical oxidation subsequent reduction of Ni hydroxides, enabling much lower overpotentials than conventional evolution. By using (isotope-labeled) differential mass spectrometry situ Raman spectroscopy combined with density functional theory calculations, evidence that originates from hydroxides to NiOO– active species while undergoing different, reductive step final release O2 due weakened Ni–O covalency. Based on this process, propose demonstrate hybrid energy storage device, which enables time-decoupled hydroxides. The authors report allowing decoupled during splitting

Language: Английский

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Electrodeposition synthesis of Co-MnP/MnO@NiP/NF catalytic materials and investigation of their performance in hydrogen evolution reaction and urea oxidation reaction

Applied Surface Science, Journal Year: 2025, Volume and Issue: unknown, P. 162464 - 162464

Published: Jan. 1, 2025

Language: Английский

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Isolated Metal Centers Activate Small Molecule Electrooxidation: Mechanisms and Applications

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

Published: Jan. 26, 2025

Abstract Electrochemical oxidation of small molecules shows great promise to substitute oxygen evolution reaction (OER) or hydrogen (HOR) enhance kinetics and reduce energy consumption, as well produce high‐valued chemicals serve fuels. For these reactions, high‐valence metal sites generated at oxidative potentials are typically considered active trigger the process molecules. Isolated atom site catalysts (IASCs) have been developed an ideal system precisely regulate state coordination environment single‐metal centers, thus optimize their catalytic property. The isolated in IASCs inherently possess a positive state, can be more readily homogeneous under than nanoparticle counterparts. Meanwhile, merely centers but lack ensemble sites, which alter adsorption configurations compared with counterparts, induce various pathways mechanisms change product selectivity. More importantly, construction is discovered limit d‐electron back donation CO 2p * orbital overly strong on resolve poisoning problems most electro‐oxidation reactions improve stability. Based advantages fields electrochemical molecules, this review summarizes recent developments advancements focusing anodic HOR fuel cells OER electrolytic alternative such formic acid/methanol/ethanol/glycerol/urea/5‐hydroxymethylfurfural (HMF) key reactions. merits different decoding structure–activity relationships specifically discussed guide precise design structural regulation from perspective comprehensive mechanism. Finally, future prospects challenges put forward, aiming motivate application possibilities for diverse functional IASCs.

Language: Английский

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