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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Recent progress on MOFs and their derivative-carbon fiber composite materials for oxygen electrocatalysis

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(32), P. 20655 - 20690

Published: Jan. 1, 2024

Based on the oxygen electrocatalytic mechanism, MOFs and their derivative-carbon fiber composites have shown excellent catalytic performance by optimizing reaction regulation which will promote development of electrocatalysts.

Language: Английский

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Graphene-MOF hybrids in high-tech energy devices—present and future advances

Hybrid Advances, Journal Year: 2024, Volume and Issue: 5, P. 100150 - 100150

Published: Feb. 4, 2024

Graphene has been employed in the methodological energy maneuvers due to remarkable structure and features, however use is limited nanosheet aggregation issues. Metal-organic framework also used for systems, nevertheless possess low conductivity stability issues towards application. This state-of-the-art review designed present essential aspects of graphene metal-organic (MOF) hybrids utilization modern devices systems. Amid storage devices, graphene-MOF have found functional lithium ion batteries, supercapacitors, fuel cells. Graphene-MOF searched surface area, structural, microstructural, physical features. For formation related techniques such as template, heating, solution, situ, hydrothermal, freeze-drying, chemical vapor deposition, facile methods used. Consequently, electron conduction, electrochemical charge/energy density, charge-discharge, reversible capacity, cyclic stability, specific capacitance, electrocatalytic activity, oxygen reduction reactions, other factors cells reported. these developed electrode electrolyte formation. Future progress on designing efficient three dimensional materials may overawe synthesis, conductivity, challenges high performance device materials.

Language: Английский

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Optimizing post-treatment strategies for enhanced oxygen reduction/evolution activity in Co–N–C electrocatalyst

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 82, P. 398 - 406

Published: Aug. 1, 2024

Language: Английский

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Enhancing catalytic activity in Mo2C nanodots via nitrogen doping and graphene integration for efficient hydrogen evolution under alkaline conditions

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 684, P. 1 - 9

Published: Jan. 11, 2025

Language: Английский

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Research advances on the anchoring mechanism of metal single-atom catalysts

Journal of Industrial and Engineering Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Language: Английский

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Hollow mesoporous metal-nitrogen-carbon electrocatalysts with enhanced oxygen reduction activity for zinc–air batteries

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

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Efficient Amidation of Aldehydes and Amine Hydrochloride Salts by Magnetic Cu-MOF Nanocatalyst

Colloids and Surfaces A Physicochemical and Engineering Aspects, Journal Year: 2025, Volume and Issue: unknown, P. 136648 - 136648

Published: March 1, 2025

Language: Английский

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Atomic Rare‐Earth Gd‐N‐C Nanosheets with Low f‐d‐p Hybridization Energy for Efficient Oxygen Reduction Reaction

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

Published: April 7, 2025

Abstract Developing the new member of transition Metal‐nitrogen‐carbon (M‐N‐C) for oxygen reduction reaction (ORR) is critical to address issues in 3d‐orbital metal M‐N‐C as noble metal‐free catalyst achieve affordable fuel cells and metal‐air batteries. Herein, Gd‐N‐C nanosheets are developed by pyrolyzing self‐polymerized compound 2, 6‐diaminopyridine initiated GdCl 3 . The features a unique mixed structure single GdN 5 moieties Gd x N y O z atomic clusters, exhibiting excellent ORR performance with half‐wave potentials 0.89 0.76 V versus RHE 0.1 M KOH 0.5 H 2 SO 4 , respectively, activity confirmed high‐performance Zn‐air battery proton exchange membrane cell maximum power density 191 370 mW cm −2 cathodes, respectively. Moreover, theoretical calculation verifies that moiety specific f‐d hybridization facilitates interaction intermediate OH* produce d‐p hybridization, which can significantly reduce adsorption energy OH*, while existence clusters also enhance effect effectively promote ORR. results confirm active site first time extend library catalysts.

Language: Английский

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Pyrolytic Transformation of Zn-TAL Metal–Organic Framework into Hollow Zn–N–C Spheres for Improved Oxygen Reduction Reaction Catalysis

ACS Omega, Journal Year: 2025, Volume and Issue: 10(15), P. 15280 - 15291

Published: April 12, 2025

Metal-organic frameworks (MOFs) are promising precursors for creating metal-nitrogen-carbon (M-N-C) electrocatalysts with high performance, though maintaining their structure during pyrolysis is challenging. This study examines the transformation of a Zn-based MOF into an M-N-C electrocatalyst, focusing on preservation carbon framework and prevention Zn aggregation pyrolysis. A highly porous Zn-N-C electrocatalyst derived from Zn-TAL (where TAL stands TalTech-UniTartu Alliance Laboratory) was synthesized via optimized pyrolysis, yielding notable electrocatalytic activity toward oxygen reduction reaction (ORR). Scanning electron microscopy (SEM) X-ray diffraction spectroscopy (XRD) analyses confirmed that preserved its integrity remained free metal aggregates, even at elevated temperatures. Rotating disc electrode (RDE) tests in alkaline solution showed demonstrated ORR par commercial Pt/C electrocatalysts. In anion-exchange membrane fuel cell (AEMFC), material pyrolyzed 1000 °C exhibited peak power density 553 mW cm-2 60 °C. work demonstrates excellent precursor forming hollow structures, making it high-performance Pt-free cells.

Language: Английский

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