Structural Regulation Strategies of Atomic Cobalt Catalysts for Oxygen Electrocatalysis

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 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.

Language: Английский

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Tailoring Atomically Precise Gold Nanoclusters for Boosting Selective Hydrogenation of Nitrostyrene with H₂

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: March 13, 2025

Hydrogenation reactions represent some of the most extensively studied topics within field catalysis. A novel alkynyl and phosphine coprotected [Au34(PhC≡C)14(Ph3P)6](SO3CF3)2(1) nanocluster has been synthesized, its structure was determined by single crystal X-ray diffraction (SCXRD). Density functional theory calculation shows that 1 features an 18-electron superatomic molecule character with a configuration (1σ)2(1n)2(1π)2(2σ)2(1σ*)2(3σ)2(2n)2(3n)2(1π*),2 which is significantly different from previously reported metal nanoclusters. In comparison gold nanoclusters similar composition or size but ligands surface coordination structures, except for ligand effect (different kinds ligands), involving Au(I) sites derived PhC≡C–Au–C≡CPh monomeric staple motif steric hindrance PhC≡C Ph3P on 1, special electronic play critical role in ensuring enhanced catalytic performance 1/TiO2 toward chemoselective hydrogenation 4-nitrostyrene H2. The turnover frequency (TOF) 1322.5 h–1 number (TON) 23500 highest values observed among nanocluster-based catalysts same reaction. It presents example tailoring to modulate performance, offers valuable insights rational design synthesis trade off activity selectivity at atomic level.

Language: Английский

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Orderly Stacked “Tile” Architecture with Single‐Atom Iron Boosts Oxygen Reduction in Liquid and Solid‐State Zn–Air Batteries

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 23, 2025

Abstract Oxygen reduction reaction plays a crucial role in energy‐related devices. However, four‐electron transfer process involved this is usually constrained by sluggish kinetics. Single atomic (SA) Fe catalysts have attracted extensive attention due to the high atom utilization, yet impact of support architecture on accelerating has been largely overlooked. Inspired edge‐rich and ordered tile that facilitates rainwater runoff, an orderly stacked “tile” carbon with highly dispersed SA doped S prepared through morphology‐persistent conversion new metal–organic framework assembly. The catalyst exhibits higher half‐wave potential 0.91 V 0.1 M KOH, when compared Pt/C atoms lamellar carbon. This because kinetics accelerated while weakens Fe–O interaction, decreases *OH binding strength. Importantly, catalyst, working at air cathodes, powers liquid solid‐state Zn–air batteries show high‐power density remarkable stability, can effectively charge mobile phone. work not only provides effective but also highlights importance for developing advanced catalysts.

Language: Английский

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Facile Microwave Synthesis of Kilogram‐Scale Electrocatalysts with Nanocarbons Bridged Cobalt Active Sites for Enhanced Oxygen Electrocatalysis

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 30, 2025

Abstract Oxygen reductions and evolution reactions (ORR/OER) are pivotal electrochemical processes in fuel cells metal‐air batteries, yet the rapid, large‐scale production of efficient ORR/OER electrocatalysts remains challenging. Herein, a groundbreaking microwave‐synthesis strategy is presented that enables rapid facile preparation kilogram‐scale electrocatalysts. The unique microwave irradiation generates instantaneous thermal energy, facilitating formation nano‐carbon bridges interconnect high‐density active sites comprising cobalt single atoms nanoparticles. This innovative architectural configuration significantly enhances kinetics electron/mass transfer maximizing accessibility sites. optimized carbon‐bridged catalyst (CBCo‐800) demonstrates commendable half‐wave potential ( E 1/2 ) 0.86 V versus RHE minimal overpotential difference (Δ 0.696 V. Furthermore, lab‐assembled zinc‐air battery utilizing CBCo‐800 achieved great specific capacity 794 mAh g −1 sustained over 650 h, outperforming commercial Pt/C RuO 2 catalysts. Density functional theory (DFT) calculations elucidate nanocarbon bridge between dual‐active boosts oxygen activation optimizes adsorption/desorption dynamics *OH/*OOH intermediates, thereby lowering energy barriers for ORR/OER. study offers solution producing site materials, also establishes robust platform mass high‐performance

Language: Английский

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Progress of synergistic oxygen electrocatalysis between single atoms and nanoparticles/clusters

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 125, P. 86 - 99

Published: April 8, 2025

Language: Английский

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