Microenvironment Engineering of Single/Dual‐Atom Catalysts for Electrocatalytic Application

Advanced Materials, Год журнала: 2023, Номер 35(31)

Опубликована: Фев. 23, 2023

Single/dual-metal atoms supported on carbon matrix can be modulated by coordination structure and neighboring active sites. Precisely designing the geometric electronic uncovering structure-property relationships of single/dual-metal confront with grand challenges. Herein, this review summarizes latest progress in microenvironment engineering single/dual-atom sites via a comprehensive comparison single-atom catalyst (SACs) dual-atom catalysts (DACs) term design principles, modulation strategy, theoretical understanding structure-performance correlations. Subsequently, recent advances several typical electrocatalysis process are discussed to get general reaction mechanisms finely-tuned SACs DACs. Finally, full-scaled summaries challenges prospects given for This will provide new inspiration development atomically dispersed electrocatalytic application.

Язык: Английский

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Fundamental Understanding of Structural Reconstruction Behaviors in Oxygen Evolution Reaction Electrocatalysts

Advanced Energy Materials, Год журнала: 2023, Номер 13(31)

Опубликована: Июнь 29, 2023

Abstract Transition metal‐based oxyhydroxides (MOOH) derived from the irreversible structural reconstruction of precatalysts are often acknowledged as real catalytic species for oxygen evolution reaction (OER). Typically, reconstruction‐derived MOOH would exhibit superior OER activity compared to their directly synthesized counterparts, despite being fundamentally similar in chemistry. As such, has emerged a promising strategy boost electrocatalysts. However, in‐depth understanding origin reconstructed materials still remains ambiguous, which significantly hinders further developments highly efficient electrocatalysts based on In this review, comprehensive overview behaviors reported is provided and intrinsic chemical origins high efficiency toward unveiled. The fundamentals mechanisms, along with recommended characterization techniques dynamic process analyzing structure also interpreted. Finally, view chemistry, potential perspectives facilitate design synthesis durable electrocatalyst presented.

Язык: Английский

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Geometric and Electronic Engineering of Atomically Dispersed Copper‐Cobalt Diatomic Sites for Synergistic Promotion of Bifunctional Oxygen Electrocatalysis in Zinc–Air Batteries

Advanced Materials, Год журнала: 2023, Номер 35(25)

Опубликована: Апрель 11, 2023

The development of rechargeable zinc-air batteries is heavily dependent on bifunctional oxygen electrocatalysts to offer exceptional reduction/evolution reaction (ORR/OER) activities. However, the design such with high activity and durability challenging. Herein, a strategy proposed create an electrocatalyst comprised copper-cobalt diatomic sites highly porous nitrogen-doped carbon matrix (Cu-Co/NC) abundantly accessible metal optimal geometric electronic structures. Experimental findings theoretical calculations demonstrate that synergistic effect Cu-Co dual-metal metal-N4 coordination induce asymmetric charge distributions moderate adsorption/desorption behavior intermediates. This exhibits extraordinary electrocatalytic activities in alkaline media, half-wave potential 0.92 V for ORR low overpotential 335 mV at 10 mA cm-2 OER. In addition, it demonstrates acidic (0.85 V) neutral (0.74 media. When applied battery, achieves operational performance outstanding (510 h), ranking as one most efficient reported date. work importance engineering isolated boosting electrochemical energy devices.

Язык: Английский

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Review of Carbon Support Coordination Environments for Single Metal Atom Electrocatalysts (SACS)

Advanced Materials, Год журнала: 2023, Номер 36(1)

Опубликована: Апрель 20, 2023

This topical review focuses on the distinct role of carbon support coordination environment single-atom catalysts (SACs) for electrocatalysis. The article begins with an overview atomic configurations in SACs, including a discussion advanced characterization techniques and simulation used understanding active sites. A summary key electrocatalysis applications is then provided. These processes are oxygen reduction reaction (ORR), evolution (OER), hydrogen (HER), nitrogen (NRR), dioxide (CO

Язык: Английский

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Continuous electroproduction of formate via CO2 reduction on local symmetry-broken single-atom catalysts

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Окт. 27, 2023

Abstract Atomic-level coordination engineering is an efficient strategy for tuning the catalytic performance of single-atom catalysts (SACs). However, their rational design has so far been plagued by lack a universal correlation between symmetry and properties. Herein, we synthesised planar-symmetry-broken CuN 3 (PSB-CuN ) SACs through microwave heating electrocatalytic CO 2 reduction. Remarkably, as-prepared exhibited selectivity 94.3% towards formate at −0.73 V vs. RHE, surpassing symmetrical 4 catalyst (72.4% −0.93 RHE). In flow cell equipped with PSB-CuN electrode, over 90% was maintained average current density 94.4 mA cm −2 during 100 h operation. By combining definitive structural identification operando X-ray spectroscopy theoretical calculations, revealed that intrinsic local breaking from planar D configuration induces unconventional dsp hybridisation, thus strong activity microenvironment metal centre (i.e., number distortion), high preference production in moiety. The finding opens avenue designing specific symmetries selective electrocatalysis.

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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Inter-site structural heterogeneity induction of single atom Fe catalysts for robust oxygen reduction

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Март 7, 2024

Abstract Metal-nitrogen-carbon catalysts with hierarchically dispersed porosity are deemed as efficient geometry for oxygen reduction reaction (ORR). However, catalytic performance determined by individual and interacting sites originating from structural heterogeneity is particularly elusive yet remains to be understood. Here, an porous Fe single atom catalyst (Fe SAs-HP) prepared atoms densely resided at micropores mesopores. SAs-HP exhibits robust ORR half-wave potential of 0.94 V turnover frequency 5.99 e −1 s site 0.80 V. Theoretical simulations unravel a induced optimization, where mesoporous Fe-N 4 acts real active centers result long-range electron regulation adjacent microporous sites, facilitating O 2 activation desorption key intermediate *OH. Multilevel operando characterization results identify undergo dynamic evolution basic 3 under working conditions. Our findings reveal the origin enhanced intrinsic activity sites.

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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Atomically Dispersed Zn/Co–N–C as ORR Electrocatalysts for Alkaline Fuel Cells

Journal of the American Chemical Society, Год журнала: 2024, Номер unknown

Опубликована: Янв. 18, 2024

Hydrogen fuel cells have drawn increasing attention as one of the most promising next-generation power sources for future automotive transportation. Developing efficient, durable, and low-cost electrocatalysts, to accelerate sluggish oxygen reduction reaction (ORR) kinetics, is urgently needed advance cell technologies. Herein, we report on metal–organic frameworks-derived nonprecious dual metal single-atom catalysts (SACs) (Zn/Co–N–C), consisting Co–N4 Zn–N4 local structures. These exhibited superior ORR activity with a half-wave potential (E1/2) 0.938 V versus RHE (reversible hydrogen electrode) robust stability (ΔE1/2 = −8.5 mV) after 50k electrochemical cycles. Moreover, this remarkable performance was validated under realistic working conditions, achieving record-high peak density ∼1 W cm–2 among reported SACs alkaline cells. Operando X-ray absorption spectroscopy conducted identify active sites reveal catalytic mechanistic insights. The results indicated that Co atom in structure main catalytically center, where axial oxygenated species binds form an Oads–Co–N4 moiety during ORR. In addition, theoretical studies, based potential-dependent microkinetic model core-level shift calculations, showed good agreement experimental provided insights into bonding centers This work provides comprehensive understanding Zn/Co–N–C will pave way design advancement high-performance single-site electrocatalysts other energy applications.

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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