Oxygen Evolution/Reduction Reaction Catalysts: From In Situ Monitoring and Reaction Mechanisms to Rational Design

Chemical Reviews, Journal Year: 2023, Volume and Issue: 123(9), P. 6257 - 6358

Published: March 21, 2023

The oxygen evolution reaction (OER) and reduction (ORR) are core steps of various energy conversion storage systems. However, their sluggish kinetics, i.e., the demanding multielectron transfer processes, still render OER/ORR catalysts less efficient for practical applications. Moreover, complexity catalyst–electrolyte interface makes a comprehensive understanding intrinsic mechanisms challenging. Fortunately, recent advances in situ/operando characterization techniques have facilitated kinetic monitoring under conditions. Here we provide selected highlights mechanistic studies with main emphasis placed on heterogeneous systems (primarily discussing first-row transition metals which operate basic conditions), followed by brief outlook molecular catalysts. Key sections this review focused determination true active species, identification sites, reactive intermediates. For in-depth insights into above factors, short overview metrics accurate characterizations is provided. A combination obtained time-resolved information reliable activity data will then guide rational design new Strategies such as optimizing restructuring process well overcoming adsorption-energy scaling relations be discussed. Finally, pending current challenges prospects toward development homogeneous presented.

Language: Английский

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Current Advances on the Single‐Atom Nanozyme and Its Bioapplications

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(10)

Published: Feb. 11, 2023

Nanozymes, a class of nanomaterials mimicking the function enzymes, have aroused much attention as candidate in diverse fields with arbitrarily tunable features owing to diversity crystalline nanostructures, composition, and surface configurations. However, uncertainty their active sites lower intrinsic deficiencies nanomaterial-initiated catalysis compared natural enzymes promote pursuing alternatives by imitating biological centers. Single-atom nanozymes (SAzymes) maximize atom utilization well-defined structure, providing an important bridge investigate mechanism relationship between structure catalytic activity. They risen new burgeoning alternative enzyme from vitro bioanalytical tool vivo therapy flexible atomic engineering structure. Here, focus is mainly on three parts. First, detailed overview single-atom catalyst synthesis strategies including bottom-up top-down approaches given. Then, according structural feature nanocatalysts, influence factors such central metal atom, coordination number, heteroatom doping, metal-support interaction are discussed representative applications (including antibacterial/antiviral performance, cancer therapy, biosensing) highlighted. In end, future perspective challenge facing demonstrated.

Language: Английский

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

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(2)

Published: July 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.

Language: Английский

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A general approach to 3D-printed single-atom catalysts

Nature Synthesis, Journal Year: 2023, Volume and Issue: 2(2), P. 129 - 139

Published: Jan. 2, 2023

Language: Английский

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Phosphorus-modified cobalt single-atom catalysts loaded on crosslinked carbon nanosheets for efficient alkaline hydrogen evolution reaction

Nanoscale, Journal Year: 2023, Volume and Issue: 15(7), P. 3550 - 3559

Published: Jan. 1, 2023

Efficient and low-cost transition metal single-atom catalysts (TMSACs) for hydrogen evolution reaction (HER) have been recognized as research hotspots recently with advances in delivering good catalytic activity without noble metals. However, the high-cost complex preparation of TMSACs insufficient stability limited their practical applications. Herein, a simple top-down pyrolysis approach to obtain P-modified Co SACs loaded on crosslinked defect-rich carbon nanosheets was introduced alkaline evolution, where atoms are locally confined before prevent aggregation. Thereby, abundant defects unsaturated coordination formed during significantly improved monatomic structure reduced barrier. Furthermore, synergy between cobalt phosphorus established optimize decomposition process water molecules, which delivers key promoting slow kinetics HER. As result, SAC exhibited excellent HER, overpotentials 70 mV 192 at current densities -10 mA cm-2 -100 cm-2, respectively.

Language: Английский

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Catalyzing innovation: Exploring iron oxide nanoparticles - Origins, advancements, and future application horizons

Coordination Chemistry Reviews, Journal Year: 2024, Volume and Issue: 507, P. 215750 - 215750

Published: Feb. 29, 2024

Language: Английский

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Regulating the Electronic Synergy of Asymmetric Atomic Fe Sites with Adjacent Defects for Boosting Activity and Durability toward Oxygen Reduction

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(29)

Published: March 17, 2024

Abstract The oxygen reduction reaction (ORR) plays a fundamental role in sustainable energy technologies. However, the creation of non‐precious metal electrocatalysts with high ORR activity and durability under all pH conditions is great significance but remains challenging. Herein, aim to overcome this challenge by creating Fe single atom catalyst on 2D defect‐containing nitrogen‐doped carbon support (Fe 1 /DNC) via microenvironment engineering strategy. Microkinetic modeling reveals that FeN 4 (OH) moieties are real active sites conditions. Due synergistic promotion effect denser accessible defect‐induced electronic properties, /DNC achieves extraordinary alkaline, acidic, neutral conditions, half‐wave potentials 0.95, 0.82, 0.70 V, respectively. Moreover, negligible performance decay observed stability methanol tolerance tests. Zn‐air battery employing delivers remarkable peak power density long‐term operational durability. Theoretical analysis provides compelling evidence defects adjacent can endow an inductive reshape properties balance OOH* formation OH* reduction. This work offers insight into regulation asymmetric coordination structure for boosting electrocatalytic stability.

Language: Английский

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Perovskite oxides as electrocatalysts for water electrolysis: From crystalline to amorphous

Carbon Energy, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 2, 2024

Abstract Crystalline perovskite oxides are regarded as promising electrocatalysts for water electrolysis, particularly anodic oxygen evolution reactions, owing to their low cost and high intrinsic activity. Perovskite with noncrystalline or amorphous characteristics also exhibit electrocatalytic performance toward electrochemical splitting. In this review, a fundamental understanding of the advantages crystalline, noncrystalline, is presented. Subsequently, recent progress in development advanced electrolysis by engineering breaking crystallinity reviewed, special focus on underlying structure–activity relationships. Finally, remaining challenges unsolved issues presented, an outlook briefly proposed future exploration next‐generation water‐splitting based oxides.

Language: Английский

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Recent progress of microwave absorption motivated by metal single atoms anchored on two-dimensional materials

Carbon, Journal Year: 2025, Volume and Issue: 235, P. 120095 - 120095

Published: Feb. 6, 2025

Language: Английский

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Emerging dual-atomic-site catalysts for electrocatalytic CO2 reduction

Science China Materials, Journal Year: 2022, Volume and Issue: 65(12), P. 3302 - 3323

Published: Oct. 12, 2022

Language: Английский

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