Carbon quantum dot-mediated binary metal–organic framework nanosheets for efficient oxygen evolution at ampere-level current densities in proton exchange membrane electrolyzers

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(45), P. 31253 - 31261

Published: Jan. 1, 2024

The widespread utilization of noble metal-based catalysts for the oxygen evolution reaction (OER) is hindered by their rarity and substantial expense, posing significant challenges large-scale applications.

Language: Английский

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Efficient Catalysis for Zinc–Air Batteries by Multiwalled Carbon Nanotubes‐Crosslinked Carbon Dodecahedra Embedded with Co–Fe Nanoparticles

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

Published: Jan. 10, 2025

Abstract The design and fabrication of nanocatalysts with high accessibility sintering resistance remain significant challenges in heterogeneous electrocatalysis. Herein, a novel catalyst is introduced that combines electronic pumping alloy crystal facet engineering. At the nanoscale, pump leverages chemical potential difference to drive electron migration from one region another, separating transferring electron‐hole pairs. This mechanism accelerates reaction kinetics improves rate. interface structure optimization enables CoFe/carbon nanotube (CNT) exhibit outstanding oxygen reduction (ORR) evolution (OER) performance. Specifically, this achieves an ORR half‐wave (E₁/₂) 0.895 V, outperforming standard Pt/C RuO₂ electrocatalysts terms both specific activity stability. It also demonstrates excellent electrochemical performance for OER, overpotential only 287 mV at current density 10 mA cm⁻ 2 . Theoretical calculations reveal carefully designed facets reduce energy barrier rate‐determining steps optimizing O₂ adsorption promoting capture process. study highlights developing cost‐effective bifunctional ORR–OER electrocatalysts, offering promising strategy advancing Zn–air battery technology.

Language: Английский

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Ultrasmall Iron Nanoparticle-Decorated Carbon Black for High-Efficiency Nitrate-to-Ammonia Electrosynthesis and Zinc-Nitrate Batteries

ACS Sustainable Chemistry & Engineering, Journal Year: 2024, Volume and Issue: 12(9), P. 3780 - 3789

Published: Feb. 19, 2024

Electrochemical nitrate reduction offers a low-carbon approach to producing ammonia at ambient conditions. However, the development of low-cost but efficient catalysts for production is still challenging. Herein, we report iron nanoparticles directly decorated carbon black (Fe@C-900) as electrocatalyst high-efficiency nitrate-to-ammonia electrosynthesis, which shows maximum Faraday efficiency (FE) 99% −0.5 V versus reversible hydrogen electrode (RHE), high yield rate 12,082 μg h–1 cm–2 −0.8 RHE, and long-term stability. Combined in situ electrochemical analyses nitrite tests reveal that NO2* species are key intermediates production. Comparative experiments serve active sites produce further electrosynthesis. More importantly, resultant Zn-NO3– battery with Fe@C-900 cathode achieves large power density 12 mW FE 99%. This work provides metal-based catalyst energy storage, via battery.

Language: Английский

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Triggered factors and structure-activity relationship in the dynamic reconstruction processing of MOF for the alkaline oxygen evolution reaction

Coordination Chemistry Reviews, Journal Year: 2024, Volume and Issue: 522, P. 216235 - 216235

Published: Oct. 1, 2024

Language: Английский

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Differentiated Modulating the Electronic Structure of NiFe@Ni/Fe‐MnOx via Phase Transformation Engineering to Synergy Promote Bifunctional Water Splitting Reactions

Small, Journal Year: 2025, Volume and Issue: 21(7)

Published: Jan. 7, 2025

Abstract Modulating electronic structure to balance the requirement of both hydrogen evolution reaction (HER) and oxygen (OER) is crucial for developing bifunctional catalysts. Herein, phase transformation engineering utilized separately regulate catalyst structure, designed NiFe@Ni/Fe‐MnOOH schottky heterojunction exhibits remarkable electrocatalytic activity with low overpotentials 19 230 mV at 10 mA cm −2 HER OER in 1M KOH, respectively. Meanwhile, an anion‐exchange membrane water electrolyzer employing as electrodes shows voltages 1.487/1.953 V 10/1000 , operating over 200 h 1000 . Combining theoretical calculations experiments reveal that can differentially active phases HER/OER. In HER, Ni/Fe‐MnOOH metallic NiFe act *OH *H acceptors respectively accelerates dissociation subsequent Heyrovsky/Tafel step. While OER, significant Jahn‐Teller effect Mn 3+ induces surface reconstruction from Ni/Fe‐MnO 2 The formative high value 4+ modify M‐O hybridization activate lattice mechanism, which pivotal breaking restriction volcanic relationship reducing overpotential. These findings provide valuable design guidelines high‐performance multi‐functional electrocatalysts via engineering.

Language: Английский

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Rapid Outgassing of Hydrophilic TiO2 Electrodes Achieves Long-Term Stability of Anion Exchange Membrane Water Electrolyzers

Nano-Micro Letters, Journal Year: 2025, Volume and Issue: 17(1)

Published: March 13, 2025

Abstract The state-of-the-art anion-exchange membrane water electrolyzers (AEMWEs) require highly stable electrodes for prolonged operation. stability of the electrode is closely linked to effective evacuation H 2 or O gas generated from surface during electrolysis. In this study, we prepared a super-hydrophilic by depositing porous nickel–iron nanoparticles on annealed TiO nanotubes (NiFe/ATNT) rapid outgassing such nonpolar gases. NiFe/ATNT exhibited an overpotential 235 mV at 10 mA cm −2 oxygen evolution reaction in 1.0 M KOH solution, and was utilized as anode AEMWE achieve current density 1.67 A 1.80 V. addition, with electrode, which enables outgassing, showed record 1500 h 0.50 under harsh temperature conditions 80 ± 3 °C.

Language: Английский

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Ion exchange membranes in environmental applications: Comprehensive review

Chemosphere, Journal Year: 2025, Volume and Issue: 377, P. 144327 - 144327

Published: March 22, 2025

Language: Английский

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Synergistic Coupling of Ni-Oxalate Prism and Layered FeOOH for Oxygen Evolution Reaction in Anion Exchange Membrane Water Electrolysis

Applied Catalysis B Environment and Energy, Journal Year: 2025, Volume and Issue: unknown, P. 125393 - 125393

Published: April 1, 2025

Language: Английский

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Fine-tuning nanoflower-like Fe/Co hybrids with high content oxyhydroxide accelerating oxygen evolution kinetics

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 670, P. 124 - 131

Published: May 12, 2024

Language: Английский

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Strong Metal‐Support Interactions in Heterogeneous Oxygen Electrocatalysis

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

Published: Oct. 26, 2024

Molecular oxygen redox electrocatalysis involves reduction and evolution as core reactions in various energy conversion environmental technology fields. Strong metal-support interactions (SMSIs) based nanomaterials are regarded desirable state-of-the-art heterogeneous electrocatalysts due to their exceptional physicochemical properties. Over the past decades, considerable advancements theory experiment have been achieved related studies, especially modulating electronic structure geometrical configuration of SMSIs enable activity, selectivity, stability. In this focuses on concept SMSI, explore manifestations mechanisms action, summarizes recent advances for efficient applications. Additionally, correlation between properties different metals supports is systematically elucidated, potential structure-activity relationships catalytic performance outlined through theoretical models. Finally, obstacles confronting burgeoning field comprehensively concluded, targeted recommendations coping strategies proposed, future research perspectives outlined.

Language: Английский

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