Innovative Microstructure and Morphology Engineering of MOF‐Derived Single‐Atom Sn‐Doped ZnO Nanosheet Showing Highly Sensitive Acetone Sensing

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

Published: Feb. 3, 2025

Abstract Single‐atom materials (SAMs) have garnered widespread attention due to their maximum utilization of active metal atoms for catalytic related applications. However, the facile preparation oxide with high single‐atom loading is still challenging. Herein, derivation highly tunable metal‐organic frameworks (MOFs) precursor found be a potential method Sn‐doped ZnO high‐performance chemiresistive sensing Specifically, Sn/Zn‐MOF‐L interdigitated lamellar morphology transferred from bimetallic Sn/Zn‐MOF‐B featuring microstructure and through solvent treatment. Utilizing finely MOF as precursor, nanosheet porous structure successfully constructed. The as‐prepared doped oxides show superior acetone performances, sensor based on 8% demonstrates an astonishing response value 213 ( R / g ) toward 10 ppm low detection limit 0.52 ppb. sensitivity attributed specific surface area distribution Sn sites, benefiting manipulation precursor. loaded considerable performance offers new perspective design application SAMs.

Language: Английский

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In Situ Construction of IrO_x Nanofilm on TiO_x for Boosting Low‐Ir Catalysis in Practical PEM Electrolyze

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

Published: Feb. 10, 2025

Abstract Exploring low‐iridium (Ir) electrocatalysts for oxygen evolution reaction (OER) is exigent to promote the commercialization of proton electrolyte membrane water electrolyzers (PEMWEs). Herein, study presents a scalable and facile strategy in situ construct an IrO x nanofilm continuously coated on TiO support as efficient durable OER catalyst through one‐step annealing Ir‐salt‐adsorbed titanium‐based metal–organic frameworks (MOFs) precursor. The unique structure forms continuous p‐n junction interface, endowing strong interfacial electron transfer from also ensuring well‐connected conductive network anodic catalytic layer due dispersion . optimal requires low overpotential 233 mV at 10 mA cm −2 with 40‐fold com. 2 mass activity. assembled PEMWE shows cell voltage 1.762 V 1 A ≈220 h operation under start/shut‐down operation. Operando characterizations theoretical calculation reveal that not only reduces energy barrier dissociation deprotonation step *OOH boosting kinetics but prevents oxidation Ir sites form soluble species improves durability. This work offers new avenue rationally design synthesize low‐Ir application.

Language: Английский

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Chemoselective Hydrogenation of Halonitrobenzenes by Platinum Nanoparticles with Auxiliary Co–N₄ Single Sites in Sandwiched Catalysts

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: March 27, 2025

The chemoselective hydrogenation of halonitrobenzenes to haloanilines is great importance but remains challenging simultaneously achieve high catalytic activity, excellent selectivity, and good reusability, especially for ortho-substituted substrates. This due the occurrence hydrogenolysis halogen groups, as well easy migration aggregation active species on catalyst surface during nitro groups. In this study, we integrate Pt nanoparticles (NPs) with auxiliary Co–N4 single sites from a porphyrinic metal–organic framework [known PCN-221(Co)] in sandwiched nanostructure ortho-halonitrobenzenes at 80 °C 1 MPa H2 50 mL batch microreactor. achieves 97.3% selectivity ortho-chloroaniline nearly complete conversion ortho-chloronitrobenzene, an exceptionally turnover frequency (TOF) 11,625 h–1 reusability over ten cycles, outperforming state-of-the-art heterogeneous supported metal catalysts. Theoretical experimental investigations reveal that group ortho-chloronitrobenzene preferentially hydrogenated by NPs, while ortho-chloro selectively adsorbed PCN-221(Co), preventing its enhancing ortho-chloroaniline. Furthermore, PCN-221(Co) shell plays key role enriching stabilizing thus leading activity reusability. Additionally, ortho-fluoronitrobenzene ortho-bromonitrobenzene, displays 100% ortho-fluoroaniline TOF 8680 99.2% ortho-bromoaniline 5859 h–1, respectively. When meta- para-halonitrobenzenes are used substrates, corresponding also achieved

Language: Английский

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Breaking the Activity-and-Selectivity Seesaw while Enhancing Heat Management via the Lattice Effect of a Single-Atom Alloy

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 25, 2025

When single-atom catalysts are oriented toward practical applications, in addition to balancing the seesaw between activity and selectivity, capability of thermal management also merits attention. Herein, we proposed a facility approach that, based on active Pd state single atom, tunes guest Cu size simultaneously enhance effect d-electron domination heat transfer behavior microregions. Along with an order magnitude increase, more delocalized electrons were generated transferred isolated sites, d band center shifting from 1.438 1.052 eV, closer Fermi level. Simultaneously, long-range ordered lattices much favorable for transferring situ thermally phonons diffusivity surging 12.36 103.49 mm2/s. The optimized Pd1Cu-SAA catalyst exhibited state-of-the-art performance acetylene hydrogenation, achieving full conversion at 140 °C, 95.3% selectivity good stability test period.

Language: Английский

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Preparation and catalytic performance study of Pd-Au bimetallic catalysts supported on polyaniline-derived nitrogen and phosphorus co-doped carbon for the selective hydrogenation of p-chloronitrobenzene

Applied Catalysis A General, Journal Year: 2025, Volume and Issue: 702, P. 120332 - 120332

Published: May 6, 2025

Language: Английский

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Graphite Carbon Nitride Accelerating Interfacial Electron Transfer of Defect-Rich TiO2 for N2 Photofixation

Catalysts, Journal Year: 2024, Volume and Issue: 15(1), P. 19 - 19

Published: Dec. 29, 2024

The photocatalytic N2 fixation reaction still faces high activation energy barriers and inefficient electron transfer efficiency, limiting the overall ammonia yield of semiconductors. This communication reports on construction an organic/inorganic g-C3N4/oxygen vacancy-enriched TiO2 (g-C3N4/TiO2-OV) composite system via annealing treatment in H2/Ar mixed atmosphere for enhanced activity. After illumination 4 h, g-C3N4/TiO2-OV with 1 wt% g-C3N4 loading demonstrates optimal 31.6 μmol L−1. study existence oxygen vacancies surface through EPR while also investigating carrier separation transport efficiency material using photoelectric characterization. experimental results indicate that introduction OVs into serves as Lewis acid sites, facilitating adsorption. Moreover, lower onset potential higher current density composites heterojunction significantly decreases interfacial charge recombination barrier, effectively improving towards photo-reduction. work emphasizes importance rational tailoring TiO2-based photocatalysts field fixation.

Language: Английский

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