Enhancing Electrocatalytic Activity Through Targeted Local Electrolyte Micro‐Environment

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

Published: Jan. 10, 2025

Abstract The local electrolyte micro‐environment surrounding the catalyst reaction center, including critical factors such as pH, reactant concentration, and electric field, plays a decisive role in electrocatalytic reactions water splitting. Recently, this topic has garnered significant attention due to its potential significantly enhance catalytic performance. While various strategies optimize processes have been explored, deliberate control over fundamental principles guiding these adjustments remain their early stages of development. This review provides comprehensive examination key efforts aimed at designing tailoring localized micro‐environments improve It discusses advances micro‐environmental design, methodologies for evaluating shifts, mechanistic insights driving developments. Additionally, highlights existing challenges prospective industrial applications strategies. By offering detailed analysis recent developments, aims equip researchers with practical knowledge on controlling micro‐environments, thereby accelerating progress toward real‐world processes.

Language: Английский

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A Highly‐Efficient Boron Interstitially Inserted Ru Anode Catalyst for Anion Exchange Membrane Fuel Cells

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(5)

Published: Nov. 7, 2023

Abstract Developing high‐performance electrocatalysts for alkaline hydrogen oxidation reaction (HOR) is crucial the commercialization of anion exchange membrane fuel cells (AEMFCs). Here, boron interstitially inserted ruthenium (B‐Ru/C) synthesized and used as an anode catalyst AEMFC, achieving a peak power density 1.37 W cm −2 , close to state‐of‐the‐art commercial PtRu catalyst. Unexpectedly, instead monotonous decline HOR kinetics with pH generally believed, inflection point behavior in pH‐dependent on B‐Ru/C observed, showing anomalous that activity under electrolyte surpasses acidic electrolyte. Experimental results functional theory calculations reveal upshifted d‐band center Ru after intervention interstitial can lead enhanced adsorption ability OH H 2 O, which together reduced energy barrier water formation, contributes outstanding performance mass 1.716 mA µg PGM −1 13.4‐fold 5.2‐fold higher than Ru/C Pt/C, respectively.

Language: Английский

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Correlating Single‐Atomic Ruthenium Interdistance with Long‐Range Interaction Boosts Hydrogen Evolution Reaction Kinetics

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(2)

Published: Nov. 16, 2023

Correlated single-atom catalysts (c-SACs) with tailored intersite metal-metal interactions are superior to conventional isolated metal sites. However, precise quantification of the single-atomic interdistance (SAD) in c-SACs is not yet achieved, which essential for a crucial understanding and remarkable improvement correlated metal-site-governed catalytic reaction kinetics. Here, three Ru fabricated SAD using planar organometallic molecular design π-π molecule-carbon nanotube confinement. This strategy results graded from 2.4 9.3 Å c-SACs, wherein tailoring into 7.0 generates an exceptionally high turnover frequency 17.92 H

Language: Английский

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Double‐Tuned RuCo Dual Metal Single Atoms and Nanoalloy with Synchronously Expedited Volmer/Tafel Kinetics for Effective and Ultrastable Ampere‐Level Current Density Hydrogen Production

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(40)

Published: July 31, 2023

Abstract Alkaline water electrolysis system is of general interest but impeded by the unsatisfactory hydrogen evolution reaction (HER) performance under ampere‐level current density. Herein, synchronous modification complicated Volmer/Tafel kinetics effectuated for attaining density production via engineering double‐tuned RuCo nanoalloy and dual metal single atoms on hierarchical N‐doped mesoporous carbon (RuCo@Ru SA Co ‐NMC). The electronic structure Ru sites in can be synergistically tailored adjacent atomic nanoalloy, which makes it achieve faster Volmer with rapid adsorption/dissociation transfer rates toward adsorbed hydroxyl. While alloyed undertake optimized Tafel boosted hydrogen. Accordingly, RuCo@Ru ‐NMC exhibits ultralow HER overpotential 255 mV at 1 A cm −2 robust stability over 24 days, ultrahigh mass activity 37.2 mg −1 , turnover frequency 19.5 s . More importantly, make possess low power consumption 5.34 kWh per Nm 3 H2 estimated costs 1.197 $ kg concept emphasized this study provides guidance rational design cost‐effective catalysts production.

Language: Английский

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Greatly Boosting Seawater Hydrogen Evolution by Surface Amorphization and Morphology Engineering on MoO₂/Ni₃(PO₄)₂

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(51)

Published: Sept. 8, 2023

Abstract Hydrogen production through seawater electrolysis faces several challenges, one of which involves the development electrocatalysts with high catalytic performance. Here, surface amorphization and morphology engineering are combined to design a novel electrocatalyst for highly‐efficient hydrogen evolution reaction (HER). The surface‐amorphized MoO 2 /Ni 3 (PO 4 ) microcolumns supported on nickel foam (SA‐MoO /NF) display remarkable performance low overpotentials 34 46 mV at current density 10 mA cm −2 in 1 m KOH alkaline seawater, respectively. In addition, cell (AEC) integrated SA‐MoO /NF as cathode Ni anode achieves 100 1.87 V 6 60 °C, superior that industrial NiMo electrode (2.05 V). DFT calculations demonstrate amorphous layer (MoO x improves adsorption energy sample reduces barrier water dissociation. It is found substantial improvement stems from synergistic effect between unique microcolumn morphology. These findings may provide insights into combining strategies enhance pave way highly efficient HER electrocatalysts.

Language: Английский

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