Breaking the Activity and Stability Bottlenecks of Electrocatalysts for Oxygen Evolution Reactions in Acids

Advanced Materials, Год журнала: 2023, Номер 35(49)

Опубликована: Авг. 7, 2023

Oxygen evolution reaction (OER) is a cornerstone for variety of electrochemical energy conversion and storage systems such as water splitting, CO2 /N2 reduction, reversible fuel cells, metal-air batteries. However, OER catalysis in acids suffers from extra sluggish kinetics due to the additional step dissociation along with its multiple electron transfer processes. Furthermore, catalysts often suffer poor stability harsh acidic electrolytes severe dissolution/corrosion The development active stable highly demanded. Here, recent advances electrocatalysis are reviewed key strategies summarized overcome bottlenecks activity both noble-metal-based noble metal-free catalysts, including i) morphology engineering, ii) composition iii) defect engineering. Recent achievements operando characterization theoretical calculations which provide an unprecedented understanding mechanisms regarding site identification, surface reconstruction, degradation/dissolution pathways. Finally, views offered on current challenges opportunities break activity-stability relationships mechanism understanding, catalyst design, well standardized evaluation industrial applications proton exchange membrane electrolyzers beyond.

Язык: Английский

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RuO₂–CeO₂ Lattice Matching Strategy Enables Robust Water Oxidation Electrocatalysis in Acidic Media via Two Distinct Oxygen Evolution Mechanisms

ACS Catalysis, Год журнала: 2024, Номер 14(5), С. 3298 - 3307

Опубликована: Фев. 15, 2024

The discovery of acid-stable and highly active electrocatalysts for the oxygen evolution reaction (OER) is crucial in quest high-performance water-splitting technologies. Herein, a heterostructured RuO2–CeO2 electrocatalyst was constructed by using lattice-matching strategy. interfacial Ru–O–Ce bridge structure provided channel electron transfer between Ru Ce, creating lattice stress that distorts local RuO2. resulting catalyst exhibited attractive stability with negligible decay after 1000 h OER 0.5 M H2SO4, along high activity an overpotential only 180 mV at 10 mA cm–2. In situ attenuated total reflectance surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS), differential electrochemical mass spectrometry (DEMS), density functional theory (DFT) calculations were used to reveal interface noninterface RuO2 sites enabled oxide path mechanism (OPM) enhanced adsorbate (AEM-plus), respectively, during OER. simultaneous independent pathways accessible matching guides improved design acidic media.

Язык: Английский

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Phase Engineering on Amorphous/Crystalline γ‐Fe₂O₃ Nanosheets for Boosting Dielectric Loss and High‐Performance Microwave Absorption

Advanced Functional Materials, Год журнала: 2023, Номер 34(10)

Опубликована: Ноя. 22, 2023

Abstract To design and develop efficient microwave absorbents via phase engineering is still less studied. The unique properties caused by constructing heterophase structure hold the potential to strengthen absorbing capability toward radiation. Herein, amorphous/crystalline γ‐Fe 2 O 3 nanosheets (Fe‐H) are carefully fabricated through a controlled annealing process. matched Fermi levels formed on both sides of interface not only provides interfacial polarizations but also facilitates transport electrons with scattering over whole Fe‐H nanosheets. Thereby, conduction loss dielectric polarization relaxation promoted, leading strengthened attenuation electromagnetic wave as‐synthesized sample exhibited minimum reflection ‐89.5 dB centered at thickness 2.00 mm, associated an effective absorption bandwidth (reflection ≤ ‐10 dB) reaching 6.45 GHz. All these behaviors superior its pure amorphous absorbent bare crystalline counterpart. Furthermore, this strategy valid when extended Co Ni based oxides, suggesting universality generality for promoting absorption. Henceforth, study indicates favorable synthesis application materials as absorbents.

Язык: Английский

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Electron donation from carbon support enhances the activity and stability of ultrasmall ruthenium dioxide nanoparticles in acidic oxygen evolution reaction

Journal of Colloid and Interface Science, Год журнала: 2025, Номер 686, С. 438 - 447

Опубликована: Фев. 1, 2025

Язык: Английский

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Boosting oxygen evolution performance over synergistic tiara nickel clusters and thin layered double hydroxides

Deleted Journal, Год журнала: 2024, Номер unknown

Опубликована: Авг. 2, 2024

The two-dimensional layered double hydroxides (LDHs) and zero-dimensional metal clusters have emerged as promising nanomaterials in the field of sustainable water oxidation, which can also facilitate joint experimental computational studies. In this study, synthesis Ni₆@LDH composites, comprising atomically precise Ni₆(MPA)₁₂ (MPA: mercaptopropionic acid) embedded into LDH nanosheets via electrostatic interaction, represents a significant advancement development for oxidation. Ni₆@NiFe-LDH exhibits superior electrochemical performance oxygen evolution reaction (OER), exhibiting OER overpotentials 198 mV@10 mA·cm⁻² 290 mV@100 with low Tafel slope 29 mV·dec⁻¹. It surpasses corresponding NiFe-LDH commercial RuO₂ catalysts, primarily due to synergistic interaction between Ni₆ LDHs. Interestingly, our combined approach reveals that M-OOH_ads formation is rate-determining step (RDS) Ni₆-based differing from RDS itself (the M-O_ads formation). These efforts serve an attempt push forward current research frontier study structure–property relationships progressing micro-/nano-level atomic-level.

Язык: Английский

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Molten Salt‐Assisted Synthesis of Catalysts for Energy Conversion

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Сен. 9, 2024

Abstract A breakthrough in manufacturing procedures often enables people to obtain the desired functional materials. For field of energy conversion, designing and constructing catalysts with high cost‐effectiveness is urgently needed for commercial requirements. Herein, molten salt‐assisted synthesis (MSAS) strategy emphasized, which combines advantages traditional solid liquid phase catalysts. It not only provides sufficient kinetic accessibility, but effectively controls size, morphology, crystal plane features product, thus possessing promising application prospects. Specifically, selection role salt system, as well mechanism assistance are analyzed depth. Then, creation catalyst by MSAS electrochemical conversion related introduced detail. Finally, key problems countermeasures faced breakthroughs discussed look forward future. Undoubtedly, this systematical review insights here will promote comprehensive understanding further stimulate generation new efficiency

Язык: Английский

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Energy-efficient anodic reactions for sustainable hydrogen production via water electrolysis

Chemical Synthesis, Год журнала: 2023, Номер 3(4)

Опубликована: Окт. 13, 2023

Overall water splitting is considered as an effective technique for hydrogen (H2) production; however, it usually requires large operating voltage mainly due to the high equilibrium potential of anodic oxygen evolution reaction (OER). Replacing OER with energy-saving anode reactions not only reduces H2 production but also generates high-value-added chemicals or purifies wastewater. This review article provides overview fundamental principles overall and typical alternative reactions, including methanol oxidation, hydrazine urea oxidation reactions. Then, preparation methods, regulation strategies, composition/structure-performance relations advanced catalysts these energy-efficient generation technologies are discussed. Finally, we propose underlying challenges perspectives this promising field.

Язык: Английский

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An effective bimetallic oxide catalyst of RuO2-Co3O4 for alkaline overall water splitting

Nano Research, Год журнала: 2023, Номер 17(5), С. 3785 - 3793

Опубликована: Дек. 29, 2023

Язык: Английский

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Synergistic spin–valence catalysis mechanism in oxygen reduction reactions on Fe–N–C single-atom catalysts

Journal of Materials Chemistry A, Год журнала: 2023, Номер 11(25), С. 13502 - 13509

Опубликована: Янв. 1, 2023

Theoretical calculations revealed the synergistic spin–valence catalysis mechanism in oxygen reduction reaction on Fe–N–C single-atom catalysts and elucidated crucial role of synergy spin valence Fe site determining its activity.

Язык: Английский

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Balancing the relationship between the activity and stability of anode oxide-based electrocatalysts in acid for PEMWE electrolyzers

Journal of Materials Chemistry A, Год журнала: 2024, Номер 12(30), С. 18751 - 18773

Опубликована: Янв. 1, 2024

This review covers advancements in noble and non-noble metal oxides for acidic OER, emphasizing the evaluation of catalyst instability, strategies to enhance IrO 2 , RuO TM oxides.

Язык: Английский

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