Nanoscale Metal Particle Modified Single‐Atom Catalyst: Synthesis, Characterization, and Application

Advanced Materials, Год журнала: 2023, Номер 36(2)

Опубликована: Июль 13, 2023

Single-atom catalysts (SACs) have attracted considerable attention in heterogeneous catalysis because of their well-defined active sites, maximum atomic utilization efficiency, and unique unsaturated coordinated structures. However, effectiveness is limited to reactions requiring sites containing multiple metal atoms. Furthermore, the loading amounts single-atom must be restricted prevent aggregation, which can adversely affect catalytic performance despite high activity individual The introduction nanoscale particles (NMPs) into SACs (NMP-SACs) has proven an efficient approach for improving performance. A comprehensive review urgently needed systematically introduce synthesis, characterization, application NMP-SACs mechanisms behind superior This first presents classifies different through NMPs enhance SACs. It then summarizes currently reported synthetic strategies state-of-the-art characterization techniques NMP-SACs. Moreover, electro/thermo/photocatalysis, reasons are discussed. Finally, challenges perspectives future design advanced addressed.

Язык: Английский

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Bifunctional Single Atom Catalysts for Rechargeable Zinc–Air Batteries: From Dynamic Mechanism to Rational Design

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

Опубликована: Июнь 7, 2023

Ever-growing demands for rechargeable zinc-air batteries (ZABs) call efficient bifunctional electrocatalysts. Among various electrocatalysts, single atom catalysts (SACs) have received increasing attention due to the merits of high utilization, structural tunability, and remarkable activity. Rational design SACs relies heavily on an in-depth understanding reaction mechanisms, especially dynamic evolution under electrochemical conditions. This requires a systematic study in mechanisms replace current trial error modes. Herein, fundamental oxygen reduction is first presented combining situ and/or operando characterizations theoretical calculations. By highlighting structure-performance relationships, rational regulation strategies are particularly proposed facilitate SACs. Furthermore, future perspectives challenges discussed. review provides thorough SACs, which expected pave avenue exploring optimum effective ZABs.

Язык: Английский

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Cooperation between Dual Metal Atoms and Nanoclusters Enhances Activity and Stability for Oxygen Reduction and Evolution

ACS Nano, Год журнала: 2023, Номер 17(9), С. 8622 - 8633

Опубликована: Апрель 27, 2023

We have achieved the synthesis of dual-metal single atoms and atomic clusters that co-anchor on a highly graphitic carbon support. The catalyst comprises Ni4 (and Fe4) nanoclusters located adjacent to corresponding NiN4 FeN4) single-atom sites, which is verified by systematic X-ray absorption characterization density functional theory calculations. A distinct cooperation between Fe4 (Ni4) FeN4 (NiN4) sites optimizes adsorption energy reaction intermediates reduces barrier potential-determining steps. This exhibits enhanced oxygen reduction evolution activity long-cycle stability compared counterparts without commercial Pt/C. fabricated Zn-air batteries deliver high power long-term cyclability, demonstrating their prospects in storage device applications.

Язык: Английский

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Hetero‐Anionic Structure Activated CoS Bonds Promote Oxygen Electrocatalytic Activity for High‐Efficiency Zinc–Air Batteries

Advanced Materials, Год журнала: 2023, Номер 35(36)

Опубликована: Май 18, 2023

Abstract The electronic structure of transition metal complexes can be modulated by replacing partial ion to obtain tuned intrinsic oxygen reduction reaction (ORR) or evolution (OER) electrocatalytic activity. However, the anion‐modulated ORR activity is still unsatisfactory, and construction hetero‐anionic remains challenging. Herein, an atomic doping strategy presented prepare CuCo 2 O 4‐x S x /NC‐2 (CCSO/NC‐2) as electrocatalysts, structrual characterization results favorably demonstrate substitution atoms for in CCSO/NC‐2, which shows excellent catalytic performance durability OER 0.1 m KOH. In addition, catalyst assembled Zinc–air battery with open circuit potential 1.43 V maintains after 300 h cyclic stability. Theoretical calculations differential charges illustrate that optimizes kinetics promotes electron redistribution. superior CCSO/NC‐2 catalysis mainly due its unique modulation main body. introduction CoO covalency constructs a fast transport channel, thus optimizing adsorption degree active site Co intermediates.

Язык: Английский

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Research progress on the construction of synergistic electrocatalytic ORR/OER self-supporting cathodes for zinc–air batteries

Journal of Materials Chemistry A, Год журнала: 2023, Номер 11(9), С. 4400 - 4427

Опубликована: Янв. 1, 2023

The synthetic strategies, application and future development of non-precious metal-based self-supporting electrodes for Zn–air batteries have been systematically summarized according to the recent research progress.

Язык: Английский

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Prussian-Blue-Analogue-Derived Ultrathin Co₂P-Fe₂P Nanosheets for Universal-pH Overall Water Splitting

Nano Letters, Год журнала: 2023, Номер 23(17), С. 8331 - 8338

Опубликована: Авг. 30, 2023

The great interest in large-scale electrochemical water splitting toward clean hydrogen has spurred large numbers of studies on developing cost-efficient and high-performance bifunctional electrocatalysts. Here, a Prussian-blue-analogue-derived method is proposed to prepare honeycomb-like ultrathin heterogeneous Co2P-Fe2P nanosheets nickel foam, showing low overpotentials 0.080, 0.088, 0.109 V for the evolution reaction (HER) at 10 mA cm-2 as well 0.290, 0.370, 0.730 oxygen (OER) 50 alkaline, acidic, neutral electrolytes, respectively. When directly applied universal-pH electrolysis, excellent performances are achieved especially ultralow voltages 1.45 cm-2, 1.66 100 1.79 500 under alkaline conditions. In situ Raman spectroscopy measurements demonstrate that HER performance can be attributed while ultrahigh OER originates from reconstruction-induced oxyhydroxides.

Язык: Английский

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Regulating the Fe-spin state by Fe/Fe3C neighbored single Fe-N4 sites in defective carbon promotes the oxygen reduction activity

Energy storage materials, Год журнала: 2023, Номер 56, С. 394 - 402

Опубликована: Янв. 20, 2023

Язык: Английский

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Pyridinic-N exclusively enriched CNT-encapsulated NiFe interfacial alloy nanoparticles on knitted carbon fiber cloth as bifunctional oxygen catalysts for biaxially flexible zinc–air batteries

Journal of Materials Chemistry A, Год журнала: 2024, Номер 12(17), С. 10185 - 10195

Опубликована: Янв. 1, 2024

A highly reversible bifunctional electrocatalyst for flexible Zn air batteries was fabricated featuring pyridinic-N exclusively enriched CNT encased NiFe interfacial alloy nanoparticles derived from an LDH template on knitted carbon fiber cloth.

Язык: Английский

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Atomic Engineering of 3D Self‐Supported Bifunctional Oxygen Electrodes for Rechargeable Zinc‐Air Batteries and Fuel Cell Applications

Advanced Energy Materials, Год журнала: 2024, Номер 14(30)

Опубликована: Май 28, 2024

Abstract The oxygen evolution reaction (OER) and reduction (ORR) are cornerstone half reactions involved in many renewable energy technologies. High‐density single‐atom catalysts maximize the atom utilization isolated active sites. Furthermore, introduction of pyri‐N into carbon‐based nanostructures as an electrocatalyst creates abundance Here, innovative strategy is reported based on atomic scale dispersion Co atoms enriched carbon nanotube encapsulated Ni nanoparticles grown 3D electrospun nanofiber nano‐assemblies. Notably, SA Ni‐NCNT/CNF exhibited excellent OER ORR activity terms low overpotentials higher half‐wave potentials. atomically distributed allows maximum exposure sites dominated multidimensional skeleton, synergistic effects with greatly reduced delocalization around metal centers provided ideal environment for interactions intermediates, thus facilitating 4e − pathway, evidenced by DFT calculations. Moreover, Zn‐air batteries using a air cathode high‐power density admirable specific capacity. This studies may provide avenue rational modulation cost‐effective, large‐scale synthesis bifunctional electrocatalysts rechargeable anion exchange membrane fuel cell.

Язык: Английский

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Advances of Synergistic Electrocatalysis Between Single Atoms and Nanoparticles/Clusters

Nano-Micro Letters, Год журнала: 2024, Номер 16(1)

Опубликована: Июль 9, 2024

Combining single atoms with clusters or nanoparticles is an emerging tactic to design efficient electrocatalysts. Both synergy effect and high atomic utilization of active sites in the composite catalysts result enhanced electrocatalytic performance, simultaneously provide a radical analysis interrelationship between structure activity. In this review, recent advances single-atomic site coupled are emphasized. Firstly, synthetic strategies, characterization, dynamics types clusters/nanoparticles introduced, then key factors controlling discussed. Next, several clean energy catalytic reactions performed over synergistic illustrated. Eventually, encountering challenges recommendations for future advancement energy-transformation electrocatalysis outlined.

Язык: Английский

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