Structural Regulation Strategies of Atomic Cobalt Catalysts for Oxygen Electrocatalysis

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 3, 2025

Abstract Oxygen electrocatalysis is a core reaction in renewable energy devices, greatly promoting the transformation and upgrading of structure. Nonetheless, performance conversion devices hindered by large overpotential slow kinetics oxygen electrocatalytic reactions. Recently, single‐atom catalysts (SACs) have emerged as promising contenders field because their exceptional metal atom utilization, distinctive coordination environment, adjustable electronic properties. This review presents latest advancements design Co‐based SACs for electrocatalysis. First, OER ORR mechanisms are introduced. Subsequently, strategies regulating structure summarized three aspects, including centers, support carriers. A particular emphasis given to relationship between properties catalysts. Afterward, applications explored. Ultimately, challenges prospects prospected.

Язык: Английский

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Single‐Atomic Co‐N‐C Sites Anchored on Helical Carbonaceous Nanotubes for the Oxygen Reduction Reaction

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 7, 2024

Abstract Metal‐coordinated N‐doped carbon (M‐N‐C) materials with highly curved structures have become a promising class of electrocatalysts for the oxygen reduction reaction (ORR). However, stability these remains problem due to traditional post‐metal loading strategy. Herein, single‐atomic Co‐N‐C active sites anchored on helical carbonaceous nanotubes (HCNTs) are prepared (Co‐N‐C@HCNT) by pyrolyzing Co porphyrins and polypyrroles (PPys) mixtures at high‐temperature one‐step method. Aberration‐corrected high‐angle annular dark‐field scanning transmission electron microscopy (HAADF‐STEM) X‐ray absorption fine structure (XAFS) measurements confirm Co‐N 4 coordination Co‐N‐C@HCNT. The optimized Co‐N‐C@HCNT exhibits excellent catalytic ORR activity half‐wave potential ( E 1/2 ) 0.86 V versus reversible hydrogen electrode (vs RHE) compared Co‐N‐C@CNT without = 0.81 vs measured in 0.1 m KOH. also displays slight current decrease (4%) after running 10 h featuring tightly HCNTs electrostatic interactions between metal PPys. Theoretical calculations indicate that can increase charge d‐band center site, which enhances electrocatalytic activity. This work provides simple but effective strategy construct M‐N‐C materials.

Язык: Английский

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Size Engineering of Ni Nanoparticles via Dual Templates to Enhance Zinc–Iodine Batteries

ACS Applied Nano Materials, Год журнала: 2025, Номер 8(4), С. 1991 - 1999

Опубликована: Янв. 16, 2025

Zinc–iodine (Zn–I2) batteries have received widespread attention due to their higher safety, rich resources, and eco-friendly features show a promising potential for large-scale energy storage. Nevertheless, challenges such as the shuttle effect of polyiodides sluggish redox kinetics iodine species during charge discharge processes hinder development. This work reports an effective strategy improve electrochemical performance Zn–I2 through size engineering nickel nanoparticles on biomass carbon. In situ UV in Raman spectroscopies reveal that dual-template enables catalyst provide more active sites adsorption catalysis species, thereby enhancing capacity accelerating I–/I2 conversion reaction. The is also significantly inhibited. Consequently, with size-reduced host cathode exhibit superior rate performance, low polarization, long cycle life.

Язык: Английский

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Novel MIL- 101(Fe)@ZIF- 67 catalyst: boosting OER efficiency in water electrolysis

Ionics, Год журнала: 2025, Номер unknown

Опубликована: Апрель 15, 2025

Язык: Английский

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Selective two-electron and four-electron oxygen reduction reactions using Co-based electrocatalysts

Chemical Society Reviews, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Recent progress made in Co-based electrocatalysts for selective four-electron (4e − ) and two-electron (2e electrocatalytic oxygen reduction reactions is reviewed.

Язык: Английский

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Honeycomb-Like Single-Atom Catalysts with FeN3Cl Sites for High-Performance Oxygen Reduction

Advanced Powder Materials, Год журнала: 2025, Номер unknown, С. 100298 - 100298

Опубликована: Апрель 1, 2025

Язык: Английский

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Highly Dispersed Pt Anchored on Hollow Carbon Nanobowls: Negative Curvature Boosts Electrocatalytic Hydrogen Evolution

Chemical Communications, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

While commercial Pt/C remains the benchmark electrocatalyst for hydrogen evolution reaction (HER) due to optimal adsorption free energy of Pt, its bulk structure extensively embeds active sites, limiting practical utilization.

Язык: Английский

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Preparation of Molybdenum-Doped Cobalt-Iron Layered Double Hydroxide Hollow Nanorods via a ‘One-Stone-Two-Birds’ Strategy for the Oxygen Evolution Reaction

Journal of environmental chemical engineering, Год журнала: 2025, Номер unknown, С. 117133 - 117133

Опубликована: Май 1, 2025

Язык: Английский

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A highly stable metallosalen-based metal–organic framework electrocatalyst for versatile oxidative organic transformations

Journal of Catalysis, Год журнала: 2025, Номер unknown, С. 116252 - 116252

Опубликована: Май 1, 2025

Язык: Английский

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Engineering CoN₄ and FeN₄ Dual Sites with Adjacent Nanoclusters on Flexible Porous Carbon Fibers for Enhanced Electrocatalytic Oxygen Reduction and Evolution

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 11, 2024

Abstract Dual‐atom catalysts (DACs) possess tunable electronic structures and efficient atom utilization, making them highly promising for catalyzing the oxygen reduction reaction/oxygen evolution reaction (ORR/OER). However, achieving high catalytic activity stability both ORR OER in DACs remains a challenge. Herein, flexible membrane of porous carbon fiber anchored with atomically scattered CoN 4 /FeN dual sites adjacent Co 2 Fe /Fe 5 nanoclusters (Co, Fe‐DACs/NCs@PCF) is synthesized. The local geometry structure sites, which act as centers ORR/OER, are finely regulated by neighboring nanoclusters. This unique imparts Co, Fe‐DACs/NCs@PCF exceptional durability toward outperforming performance single‐atom containing only or FeN well commercial Pt/C RuO catalysts. Zinc–air battery employing cathode exhibits outstanding stability, maintaining cyclability over 1500 h, + air cathode. Theoretical calculations highlight distinct synergies between (Co ) clusters (CoN optimize coupling strength Fe(Co)─OH at potential‐determining steps thus improve (OER) kinetics. study lays theoretical practical foundation rational design heterostructure featuring coexisting within fibers.

Язык: Английский

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