Bimetallic Cu11Ag3 Nanotips for Ultrahigh Yield Rate of Nitrate‐to‐Ammonium

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 2, 2024

Electrochemical reduction of nitrate to ammonia (NRA) offers a sustainable approach for NH

Language: Английский

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Reshape Iron Nanoparticles Using a Zinc Oxide Nanowire Array for High Efficiency and Stable Electrocatalytic Nitrogen Fixation

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

Published: Jan. 21, 2025

As a type of century-old catalyst, the use iron-based materials runs through Haber–Bosch process and electrochemical synthesis ammonia because its excellent capability, low cost, abundant reserves. How to continuously improve catalytic activity stability for nitrogen fixation has always been goal pursued by scientific researchers. Herein, we develop free-standing i.e., iron nanoparticles with zinc oxide nanowire array support (Fe/ZnO NA), which exhibits high yield ∼54.81 μg h–1 mgcat.–1 Faradaic efficiency (FE) ∼9.56% in 0.5 M potassium hydroxide solution, along good reusability durability. Its electrocatalytic ability is superior that commercial Fe most reported Fe-based catalysts, thus showing great competitiveness. This ZnO NA not only supplies stable homogeneous dispersion but also provides very beneficial synergy their activity. The work renews traditional catalysts significance promoting industrialization synthesis.

Language: Английский

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Surface and Interface Engineering of Electrospun Nanofibers for Heterogeneous Catalysts

Small Methods, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 18, 2025

Abstract Surface and interface engineering of catalysts from atomic level to macroscale exhibit good performance in regulating conversion, selectivity, stability. Electrospinning offers such multiscale flexibility tuning surface structures compositions for the design fiber catalysts. This review presents an overview on electrospun nanofibers heterogeneous designing. First, building strategies catalytic at different scales are introduced. Then, typical research achievements regulation nanofiber summarized, including vacancy doping microscale, heterojunction interfaces mesoscale, surfaces/interfaces with special wettability macroscale. The reactions introduced that involve classical small molecule hydrogenation, oxygen evolution reaction, pollutant photocatalytic degradation, as well recently emerging CO 2 reduction reaction nitrate/nitrite reduction. Finally, challenges future tendency highlighted.

Language: Английский

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Integrated Three-in-one to Boost Nitrate Electroreduction to Ammonia Utilizing a 1D Mesoporous Carbon Cascade Nanoreactor

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

Published: March 10, 2025

The electrochemical reduction of nitrate (NO3-) offers a promising waste-to-value strategy for synthesizing ammonia (NH3), yet it involves complex multi-interface system with several stages such as mass transport, species enrichment, and interfacial transformation. This complexity necessitates catalysts diverse structural characteristics across multiple temporal spatial scales. Herein, three-in-one nanoreactor is designed 1D geometry, open mesochannels, synergistic active sites optimized NH3 synthesis. Guided by finite element simulations, mesoporous carbon carrier engineered to create distinctive microenvironment that enhances NO3- transfer adsorption while confining reaction intermediates. Meanwhile, iron single atomic (Fe-N4 SAs) nanoclusters (Fe4 NCs) are embedded in situ into the carrier, yielding an efficient cascade nanoreactor. design demonstrates large Faraday efficiencies, rapid removal rates, impressive yield rates under both neutral alkaline conditions. Detailed experimental results theoretical analysis reveal Fe-N4 SAs Fe4 NCs can adapt their electronic structures tandem, allowing effectively reduce oxidize H2O. As demonstration, assembled Zn-NO3- battery achieves power density 20.12 mW cm-2 coupled excellent rechargeability.

Language: Английский

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Stabilization of Electron‐Deficient Cu₁^δ+ Species by Cl–Doped CeO₂ Constructed via Electrochemical Reconstruction for Electroreduction of Nitrate to Ammonia Over 2500 Hours

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

Published: March 12, 2025

Abstract Copper (Cu)‐based catalysts have been widely used for electrochemical nitrate reduction reaction (NO 3 − RR) to produce ammonia (NH ), but their industrial application is hindered by inadequate NH yields and long‐term stability. Herein, a novel catalyst constructed of electron‐deficient single Cu atoms (Cu 1 δ+ (1 <δ <2)) anchored on oxygen vacancy (Ov)‐enriched hierarchical porous Cl–doped CeO 2 matrix hybridized carbon /Cl–CeO @C) via reconstruction /CeOCl@C efficient NO RR‐to‐NH . The optimized @C shows large yield rate 9.528 ± 0.174 mg NH3 h −1 cm −2 , high Faraday efficiency (FE) 98.8 2.13%, superior cycling stability 58 at −0.5 V versus the reversible hydrogen electrode. Impressively, it can maintain FE >95% 2500 −300 mA enabling production 20‐g scale (20.277 g). Combination experimental studies theoretical calculations demonstrates that electronic structure species be regulated stabilized Cl dopant Ce 3+ /Ov in interactions. with moderate state promotes adsorption active hydrogen, hydrogenation intermediates, thereby lowering energy barriers, suppressing side reactions, boosting electrocatalytic conversion.

Language: Английский

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Effective collective value-added recycling of nitrate and sulfion in wastewater via synergistic electrocatalysis of dual-active sites on copper-cobalt oxides

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 163044 - 163044

Published: April 1, 2025

Language: Английский

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The Nb4C3 MXenzyme Attenuates MASH by Scavenging ROS in a Mouse Model

International Journal of Nanomedicine, Journal Year: 2025, Volume and Issue: Volume 20, P. 5645 - 5659

Published: April 1, 2025

The incidence of metabolic dysfunction-associated steatohepatitis (MASH) is increasing because people's dietary habits are dominated by high caloric intake and sedentary lifestyles, leading to the accumulation lipid, reactive oxygen species (ROS) inflammation. However, treating MASH remains a challenge. Two-dimensional (2D) niobium carbide (Nb4C3) MXene nanoenzymes (MXenzymes) possess both antioxidant anti-inflammatory properties have attracted considerable attention in tumor engineering fields. Nb4C3 MXenzyme was developed for therapy exhibited biosafety antilipid peroxidation activity. reduced excessive ROS proinflammatory cytokine levels through its activities, resulting inhibition hepatocyte lipid inflammation methionine-choline-deficient diet (MCD)-induced murine model. Mechanistically, not only inhibited disrupted metabolism hepatocytes but also attenuated fatty acid-induced cell death reducing intracellular levels, which significantly promoted polarization M1 macrophages M2 alleviating oxidative stress suppressing inflammatory factor expression. can be used as multifunctional bioactive material alleviate hepatic steatosis mice robust activities.

Language: Английский

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A-Site Deficiency-Mediated Creation of Oxygen Vacancies in LaMnO_3-δ Nanofibers for Efficient Nitrate Reduction

ACS Catalysis, Journal Year: 2025, Volume and Issue: unknown, P. 8094 - 8102

Published: May 1, 2025

Language: Английский

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Enhanced Electrocatalytic Nitrate-to-Ammonia Performance from Mott-Schottky Design to Induce Electron Redistribution

Chemical Science, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

A Mott–Schottky type electrocatalyst of Co/In 2 O 3 fiber is fabricated for electrocatalytic nitrate-to-ammonia conversion, presenting a NH yield rate 70.1 mg cm −2 h −1 at −0.8 V vs. RHE, greatly surpassing the single-component Co and In samples.

Language: Английский

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Electrochemiluminescence Reveals the Structure‐Catalytic Activity Relationship of Heteroatom‐Doped Carbon‐Based Materials

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

Published: Oct. 29, 2024

Abstract Heteroatom doping can change the chemical environment of carbon‐based nanomaterials and improve their catalytic performance. Exploring structure‐catalytic activity relationship heteroatom‐doped materials is great significance for studying mechanisms designing highly efficient catalysts, but remains a significant challenge. Recently, reactive oxygen species (ROS)‐triggered electrochemiluminescence (ECL) has shown potential unveiling mechanism by which catalyze reduction reaction (ORR), owing to high sensitivity these properties electrode surface. Herein, two kinds porous carbon (denoted as NP‐C N‐C) are synthesized analyzed monitoring cathodic ECL luminol‐H 2 O in low negative‐potential region. P, N‐doped exhibits better ability activating H generate large amounts •OH •− , compared with N‐C. A sensitive antioxidant‐mediated platform successfully developed detecting antioxidant levels cells, exhibiting considerable evaluating capacity. The between structure explored using ECL, where this method be universally applied materials.

Language: Английский

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