Cation Substitution Induced d‐Band Center Modulation on Cobalt‐Based Spinel Oxides for Catalytic Ozonation

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(44)

Published: July 4, 2023

Abstract Co 3 O 4 spinel is a promising transition metal oxide (TMO) catalyst for the catalytic ozonation of volatile organic compounds (VOCs). Herein, metal–organic frameworks (MOFs)‐derived Ni‐ and Mg‐ substituted catalysts retain similar structures, but display improved reduced performance methyl mercaptan (CH SH), respectively. Remarkably, NiCo 2 can still ≈90% removal CH SH after running 20 h at room temperature under an initial concentration 50 ppm 40 , relative humidity 60%, space velocity 300 000 mL −1 g exceeding reported values. Experimental characterizations have unveiled that substitution Ni Mg into altered surface acidity, oxygen species mobility, 2+ /Co 3+ ratio. The in situ Raman spectra reveal dynamic formation Co(III)‐O ad * via transformation atomic (O *) peroxide *). Theoretical calculations verify Ni‐substitution increases nonuniform charges Fermi density, leading to moderate increase d‐band center energy levels, thereby promoting specific adsorption/activation convert */O •OH/ 1 /•O − which contributes eliminate prevent poisoning. concept tuning provide valuable insights design other ozonation.

Language: Английский

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Design and numerical modeling of chalcogenide parabolic‐core waveguide for on‐chip supercontinuum generation extending from near‐IR region to mid‐IR region

Microwave and Optical Technology Letters, Journal Year: 2024, Volume and Issue: 66(3)

Published: March 1, 2024

Abstract We present the design and computational examination of a waveguide structure with parabolic core, implemented in AsSe 2 chalcogenide glass. This aims to generate mid‐infrared (mid‐IR) supercontinuum (SC) spectrum, covering wavelength range 1.4−7.6 µm. It includes molecular fingerprint region as well earth's atmospheric transparent window. A pulsed laser providing pulses peak power 250 W pulse width 200 fs at µm was considered pump. The results illustrate that broadband SC spectrum can be achieved short (~8 mm) pumped commercially available fiber novelty this work lies generation mid‐IR using parabolic‐core normal dispersion region, which has not been investigated earlier. is crucial fabricated rectangular does remain after postprocessing but becomes similar proposed design.

Language: Английский

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Enhanced Interband Transition in FeCoNiAlTi High‐Entropy Alloy for Ultrafast Nonlinear Optical Applications

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 12(9)

Published: Dec. 8, 2023

Abstract High‐entropy alloys (HEAs) possess superior mechanical, thermal, and electronic properties, which attract great interest in the fields of photothermal, electrocatalysis, magnetic applications. Herein, nonlinear optical properties FeCoNiAlTi HEA with a large specific surface area for first time is investigated. Owing to strong d – interaction, interband transition near Fermi level could be enhanced HEAs, leading broadband absorption. Excitation picosecond laser source, possesses saturable absorption modulation depth 7.61% 30.47% at 1 1.5 µm, respectively. Furthermore, higher excitation absorber exhibits typical reverse property. Subsequently, on tapered fiber serves as Yb‐doped Er‐doped laser, noise‐like pulses stable Q‐switching, conventional soliton, dissipative soliton resonance mode‐locking operations µm. This work confirms that HEAs can endow high‐performance ultrashort pulse generation.

Language: Английский

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Modal decomposition of transverse mode-locked laser beam

Optics & Laser Technology, Journal Year: 2025, Volume and Issue: 186, P. 112626 - 112626

Published: Feb. 26, 2025

Language: Английский

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Repetition rate continuously reconfigurable supercontinuum generation using an all-fiber non-mode-locked source

Optics & Laser Technology, Journal Year: 2025, Volume and Issue: 186, P. 112747 - 112747

Published: March 5, 2025

Language: Английский

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Synthesis of soliton supramolecular structures in ultrafast lasers based on Mach-Zehnder interference

Chaos Solitons & Fractals, Journal Year: 2025, Volume and Issue: 194, P. 116274 - 116274

Published: March 10, 2025

Language: Английский

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Single-frequency fiber laser at 1440 nm based on a high gain coefficient bismuth-doped fiber

Chinese Optics Letters, Journal Year: 2025, Volume and Issue: 23(3), P. 031404 - 031404

Published: Jan. 1, 2025

Language: Английский

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Dynamical diversity of FWM-induced pulsating solitons in an ultrafast fiber laser

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: April 2, 2025

Pulsating solitons in fiber lasers embody a captivating phenomenon nonlinear optics, combining the stability of with dynamic nature pulsation. In recent years, real-time measurements have revealed variety pulsating distinct pulsation characteristics lasers, stemming from intricate properties dissipative systems. However, there are still rare studies focusing on dynamical diversity conventional soliton mode-locked lasers. Here, we report pulsations induced by four-wave mixing (FWM) laser. including single solitons, synchronous and asynchronous double-soliton bunches, molecules (SMs) observed. They all exhibit peak-dip alternation at spectral center but present varying types sidebands. The is related to periodic variations parameters, strength dispersive wave radiation, relative phase between wave. These findings will expand complicated structures

Language: Английский

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Strontium ferrite nanoparticles based broadband nonlinear optical modulator for ultrafast pulse generation in fiber lasers

Chaos Solitons & Fractals, Journal Year: 2025, Volume and Issue: 196, P. 116395 - 116395

Published: April 4, 2025

Language: Английский

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Enhanced Nonlinear Optical Properties of Bi Quantum Dot/Te Nanotube Heterojunctions for Ultrafast Photonics Applications

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

Published: May 6, 2025

Language: Английский

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