Atomically Dispersed Co₂MnN₈ Triatomic Sites Anchored in N‐Doped Carbon Enabling Efficient Oxygen Reduction Reaction

Advanced Materials, Год журнала: 2023, Номер 35(42)

Опубликована: Май 18, 2023

Atomically dispersed transition metal-nitrogen/carbon (M-N/C) catalysts have emerged as the most promising substitutes to precious platinum counterparts toward oxygen reduction reaction (ORR). However, reported M-N/C are usually in form of common M-N4 moieties with only a single metal active site, and they suffer from insufficient activity. Herein, an unusual trinuclear structure is elaborately developed nitrogen-coordinated Mn atom adjacent two Co atoms (Co2 MnN8 ) anchored N-doped carbon highly efficient ORR catalyst via adsorption-pyrolysis bimetallic zeolitic imidazolate framework precursor. Atomic structural investigations density functional theory (DFT) calculations reveal that Co2 would experience spontaneous OH binding -2OH real leading electron-filled state dz2${\mathrm{d}}_{{z}^{2}}$ orbital optimized energy intermediates. Accordingly, as-developed /C exhibits unprecedented activity high half-wave potential 0.912 V outstanding stability, not surpassing Pt/C but also representing new record for Co-based catalyst.

Язык: Английский

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Hydrogen Peroxide Spillover on Platinum–Iron Hybrid Electrocatalyst for Stable Oxygen Reduction

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(32), С. 22650 - 22660

Опубликована: Июль 30, 2024

Iron-nitrogen-carbon (Fe-N-C) catalysts, although the most active platinum-free option for cathodic oxygen reduction reaction (ORR), suffer from poor durability due to Fe leaching and consequent Fenton effect, limiting their practical application in low-temperature fuel cells. This work demonstrates an integrated catalyst of a platinum-iron (PtFe) alloy planted Fe-N-C matrix (PtFe/Fe-N-C) address this challenge. novel exhibits both high-efficiency activity stability, as evidenced by its impressive half-wave potential (

Язык: Английский

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Recent Design Strategies for M‐N‐C Single‐Atom Catalysts in Oxygen Reduction: An Entropy Increase Perspective

Advanced Functional Materials, Год журнала: 2024, Номер 34(36)

Опубликована: Март 18, 2024

Abstract Recently, a diverse array of novel metal‐nitrogen‐carbon (M‐N‐C) single‐atom catalysts (SACs) have rapidly evolve, particularly in the realm oxygen reduction reaction (ORR). Despite plethora proposed design and improvement strategies for SACs, comprehensive review systematically compiling components M‐N‐C from unified perspective is notably absent. For first time, thorough examination each component conducted, focusing on entropy increase active sites SACs. single M‐N 4 whole system, an implies elevated degree disorder chaos. Broadly, entropy‐increasing modification M (single mental sites) guest groups entails augmentation chaos, with most effective co‐catalytic synergy achieved by establishing multiple through “cocktail effect”. Concerning N (nitrogen other heteroatoms) C (carbon supports), induces heightened disorder, symmetry breaking more likely to drive toward adsorbing molecules attain equilibrium symmetric structure. All these innovative led remarkable ORR activity stability offer guiding criterion future preparation

Язык: Английский

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Nanostructure Engineering of Cathode Layers in Proton Exchange Membrane Fuel Cells: From Catalysts to Membrane Electrode Assembly

ACS Nano, Год журнала: 2024, Номер 18(18), С. 11598 - 11630

Опубликована: Апрель 26, 2024

The membrane electrode assembly (MEA) is the core component of proton exchange fuel cells (PEMFCs), which place where reaction occurrence, multiphase material transfer and energy conversion, development MEA with high activity long stability are crucial for practical application PEMFCs. Currently, efforts devoted to developing regulation nanostructure engineering, believed have advantages in improving catalyst utilization, maximizing three-phase boundaries, enhancing mass transport, operational stability. This work reviews recent research progress on platinum group metal (PGM) PGM-free catalysts multidimensional nanostructures, layers (CLs), nano-MEAs PEMFCs, emphasizing importance structure-function relationships, aiming guide further performance Then design strategy interface summarized systematically. In addition, situ characterization techniques adequately identify current density distributions, hot spots, water management visualization MEAs also discussed. Finally, limitations nanostructured discussed future promising directions proposed. paper aims provide valuable insights into fundamental science technical engineering efficient interfaces

Язык: Английский

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Unlocking the potential: machine learning applications in electrocatalyst design for electrochemical hydrogen energy transformation

Chemical Society Reviews, Год журнала: 2024, Номер unknown

Опубликована: Янв. 1, 2024

This review explores machine learning's impact on designing electrocatalysts for hydrogen energy, detailing how it transcends traditional methods by utilizing experimental and computational data to enhance electrocatalyst efficiency discovery.

Язык: Английский

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