Meso-β, β-β’ Trifused Porphyrins: Synthesis, Spectral, Electrochemical and DFT Studies and Their Femtosecond Third-Order Nonlinear Optical Properties

Dalton Transactions, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Meso -β, β–β′ trifused porphyrins have been synthesized and exhibited nonplanar conformation with a high dipole moment values. Femtosecond third-order NLO measurements demonstrated promising 3PA coefficients cross-section

Language: Английский

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Metal–Organic Framework-Derived Amorphous Cobalt–Vanadium Oxide on MWCNT: A Superior Bifunctional Catalyst for Oxygen Evolution and Reduction Reactions

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

Published: March 13, 2025

Language: Английский

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Selective two-electron and four-electron oxygen reduction reactions using Co-based electrocatalysts

Chemical Society Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Recent progress made in Co-based electrocatalysts for selective four-electron (4e − ) and two-electron (2e electrocatalytic oxygen reduction reactions is reviewed.

Language: Английский

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Electrocatalysis Using Cobalt Porphyrin Covalently Linked with Multi‐Walled Carbon Nanotubes: Hydrazine Sensing and Hydrazine‐Assisted Green Hydrogen Synthesis

Small, Journal Year: 2024, Volume and Issue: unknown

Published: July 3, 2024

Acid-treated multi-walled carbon nanotube (MWCNT) covalently functionalized with cobalt triphenothiazine porphyrin (CoTriPTZ-OH) A

Language: Английский

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Porphyrin-Based Covalent Organic Framework Encapsulating Multiwalled Carbon Nanotubes: A High-Performance Electrocatalyst for Oxygen Reduction Reaction

Langmuir, Journal Year: 2025, Volume and Issue: unknown

Published: April 17, 2025

The development of efficient and cost-effective oxygen reduction reaction (ORR) catalysts is crucial for advancing fuel cell technologies, given the limitations platinum-based catalysts. Here, we present a novel nanocomposite, cobalt-based porphyrinic covalent organic framework wrapped on multiwalled carbon nanotubes (Co-pCOF@MWCNTs), synthesized via template-directed in situ polymerization. This composite combines high porosity tunable catalytic properties COFs with excellent electrical conductivity MWCNTs. Co-pCOF@MWCNT demonstrates superior ORR activity, exhibiting an onset potential (Eonset) 0.86 V vs RHE 0.1 M KOH, surpassing performance its individual components (Co-pCOF MWCNT) other related materials. enhanced efficiency attributed to synergistic interactions between conductive MWCNT scaffold active COF nanolayers, which facilitate charge transfer increase site exposure. Furthermore, nanocomposite exhibits stability methanol tolerance, establishing as cathodic material cells. work highlights promise integrating materials opens new avenues design advanced energy conversion applications.

Language: Английский

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The Hydrogen Evolution Reaction: Using Molecular Design in Transition Metal Complexes to Control Catalytic Microenvironments on Electrode Surfaces”

ChemCatChem, Journal Year: 2024, Volume and Issue: unknown

Published: June 13, 2024

Abstract Hydrogen gas and its production from renewable power sources will be an important part of decreasing global reliance on fossil fuels developing a sustainable energy economy. Efficient electrocatalysis, however, relies the delivery both protons electrons; ideally in concerted fashion to avoid high intermediates, prevent charge build‐up, circumvent large kinetic barriers. While this can achieved using ligand design homogenous molecular transition metal catalysts (specifically incorporating proton shuttles secondary coordination sphere), heterogeneous systems are more desirable industrial perspective due their ease use enhanced durability. Supporting electrode surfaces is therefore promising approach for next generation electrocatalysts that retain level control interfacial environments. This review first cover key principles natural systems, such as hydrogenase enzymes, then survey some representative examples synthetic homogeneous hydrogen evolution incorporate these features. We discuss species have been supported materials, with focus recent advances field, major challenges remain.

Language: Английский

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Synthesis, Structural, Electrochemical, and DFT Studies of Highly Substituted Nonplanar Ni(II) Porphyrins and Their Intensity-Dependent Third-Order Nonlinear Optical Properties

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 18, 2024

We designed and successfully synthesized highly substituted electron-deficient nonplanar Ni(II) porphyrins their derivatives (

Language: Английский

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Unveiling Enhanced Oxygen Reduction in Multi-Walled Carbon Nanotube-Supported MnCo₂O₄: Experimental and Theoretical Insights into Tin Substitution for Octahedral Cobalt

ACS Applied Energy Materials, Journal Year: 2024, Volume and Issue: 7(22), P. 10417 - 10427

Published: Nov. 5, 2024

In this work, Sn-doped manganese cobaltite (Snx-MnCo2O4) was synthesized by using a solvothermal method followed an annealing process. To further increase its catalytic efficiency, it integrated onto carbon support, carboxylic acid-functionalized multiwalled nanotubes (fMWCNTs). Among the materials, fMWCNT-supported MnCo2O4 exhibits highest onset potential for oxygen reduction and shows distinctly selective four-electron reduction, as demonstrated rotating disc electrode ring experiments. X-ray photoelectron spectroscopy reveals shift in binding energy of Mn 2p owing to alterations electronic structure crystal upon incorporation Sn into MnCo2O4. Computational studies proved replacement octahedral Co ions Sn4+ ions. The withdrawal electron density species from active centers (Mn3+) leads increased electropositive character at Mn3+ centers. Since are effective catalyst, is efficiently adsorbed these centers, resulting enhanced electrocatalytic activity.

Language: Английский

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NaCl-templated synthesis of soybean-derived nitrogen-rich mesoporous carbon material: Iron phthalocyanine integration for four-electron oxygen reduction

Sustainable Energy & Fuels, Journal Year: 2024, Volume and Issue: 8(18), P. 4344 - 4354

Published: Jan. 1, 2024

Mesoporous carbon, synthesized from soybean using NaCl as a template, is further integrated with iron phthalocyanine. This combination yields material (FePc@SN950) enhanced selectivity for the four-electron oxygen reduction process.

Language: Английский

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A Comparative Study on the Electrocatalytic Efficiency of Coupled (CuO-Co3O4) vs. Mixed (CuCo2O4) Metal Oxides: Probed by Hydrazine Oxidation and Sensitive Determination

Electrochimica Acta, Journal Year: 2024, Volume and Issue: 510, P. 145337 - 145337

Published: Nov. 9, 2024

Language: Английский

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