Structural Modulation of Covalent Organic Frameworks for Efficient Hydrogen Peroxide Electrocatalysis

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(37)

Опубликована: Июнь 25, 2024

Abstract The electrochemical production of hydrogen peroxide (H 2 O ) using metal‐free catalysts has emerged as a viable and sustainable alternative to the conventional anthraquinone process. However, precise architectural design these electrocatalysts poses significant challenge, requiring intricate structural engineering optimize electron transfer during oxygen reduction reaction (ORR). Herein, we introduce novel covalent organic frameworks (COFs) that effectively shift ORR from four‐electron more advantageous two‐electron pathway. Notably, JUC‐660 COF, with strategically charge‐modified benzyl moieties, achieved continuous high H yield over 1200 mmol g −1 h for an impressive duration 85 hours in flow cell setting, marking it one most efficient non‐pyrolyzed reported date. Theoretical computations alongside situ infrared spectroscopy indicate markedly diminishes adsorption OOH* intermediate, thereby steering towards desired Furthermore, versatility was demonstrated through its application electro‐Fenton reaction, where efficiently rapidly removed aqueous contaminants. This work delineates pioneering approach altering pathway, ultimately paving way development highly effective electrocatalysts.

Язык: Английский

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V-doping and cation-vacancy engineering synergistically promote the electrocatalysis ability of NiFe-layered double hydroxides towards the oxygen evolution and urea oxidation reactions

Chemical Engineering Journal, Год журнала: 2024, Номер 493, С. 152860 - 152860

Опубликована: Июнь 5, 2024

Язык: Английский

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Electronic structure engineering of NiFe hydroxide nanosheets via ion doping for efficient OER electrocatalysis

Chemical Engineering Journal, Год журнала: 2024, Номер unknown, С. 156430 - 156430

Опубликована: Окт. 1, 2024

Язык: Английский

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Multielectronic synergetic Hf-doped NiFe-LDH/NF for efficient bifunctional electrocatalytic OER/UOR

International Journal of Hydrogen Energy, Год журнала: 2024, Номер 82, С. 724 - 732

Опубликована: Авг. 3, 2024

Язык: Английский

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Vapor deposition strategy for implanting isolated Fe sites into papermaking nanofibers-derived N-doped carbon aerogels for liquid Electrolyte-/All-Solid-State Zn-Air batteries

Journal of Colloid and Interface Science, Год журнала: 2024, Номер 673, С. 453 - 462

Опубликована: Июнь 13, 2024

Язык: Английский

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In Situ Raman Study of Layered Double Hydroxide Catalysts for Water Oxidation to Hydrogen Evolution: Recent Progress and Future Perspectives

Energies, Год журнала: 2024, Номер 17(22), С. 5712 - 5712

Опубликована: Ноя. 15, 2024

With the increasing global emphasis on green energy and sustainable development goals, electrocatalytic oxygen evolution reaction (OER) is gradually becoming a crucial focus in research water oxidation for hydrogen generation. However, its complicated processes associated with high barrier severely limit efficiency of conversion. Recently, layered double hydroxide (LDH) has been considered as one most promising catalysts alkaline media. Nonetheless, lacking deep insight into kinetic process OER detrimental to further optimization LDH catalysts. Therefore, monitoring catalytic via surface-sensitive situ spectroscopy especially important. In particular, Raman technique capable providing fingerprint information surface species intermediates operating environment. From perspective spectroscopy, this paper provides an exhaustive overview progress characterization mechanism catalysts, theoretical guidance designing materials. Finally, we present incisive discussion challenges future trend.

Язык: Английский

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Applications of layered double hydroxide nanomaterials in environmental remediation: Synthesis, structural modification and performance enhancement

Surfaces and Interfaces, Год журнала: 2024, Номер 52, С. 104902 - 104902

Опубликована: Авг. 6, 2024

Язык: Английский

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Ultrafast Electrodeposition of Durable NiFe Catalysts for Efficient Hydrogen Evolution Reaction

ChemistrySelect, Год журнала: 2025, Номер 10(1)

Опубликована: Янв. 1, 2025

Abstract Finding noble‐metal‐free hydrogen evolution reaction (HER) catalysts with facile synthesis and efficient performance is essential to carry out electrochemical overall water splitting for energy development. An ultrafast electrodeposition technique the of NiFe developed. The rapid nanoparticle film morphology was achieved by uniformly anchoring particles onto three‐dimensional nickel foam (NF) via one‐step constant‐current in 30 s. catalyst exhibited excellent HER electrocatalytic activity stability 1.0 M KOH solution. To attain a current density 10 mA·cm −2 , displayed favorable kinetics an overpotential 168 mV Tafel slope 168.5 mV·dec −1 . Continuous tests NiFe/NF electrode were conducted up 23 h at 10·mA·cm decrease merely 2 mV, exhibiting outstanding durability.

Язык: Английский

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Electrodeposited Nitrate-Intercalated NiFeCe-Based (Oxy)hydroxide Heterostructure as a Competent Electrocatalyst for Overall Water Splitting

Inorganic Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Янв. 13, 2025

Electrochemical water splitting is a promising method for the generation of "green hydrogen", renewable and sustainable energy source. However, complex, multistep synthesis processes, often involving hazardous or expensive chemicals, limit its broader adoption. Herein, nitrate (NO3-) anion-intercalated nickel-iron-cerium mixed-metal (oxy)hydroxide heterostructure electrocatalyst fabricated on nickel foam (NiFeCeOxHy@NF) via simple electrodeposition followed by cyclic voltammetry activation to enhance surface properties. The NiFeCeOxHy@NF exhibited low overpotential 72 186 mV at 10 mA cm-2 hydrogen evolution reaction (HER) oxygen (OER), respectively, in 1.0 M KOH. In two-electrode system, obtained voltage 1.47 V KOH with robust stability. Results revealed that notable activity catalyst primarily due (i) hierarchical nanosheet morphology, which provides large area abundant active sites; (ii) NO3- anion intercalation enhances electrode stability eliminates need binders while simultaneously promoting strong catalyst-substrate adhesion, resulting decreased resistance accelerated kinetics; (iii) unique superhydrophilic properties facilitate electrolyte penetration through capillary action minimize gas bubble formation reducing interfacial tension.

Язык: Английский

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Ultrasonic-assisted structural engineering of NiFe-LDH nanosheets: Unraveling the mechanistic enhancements in alkaline OER for green electrocatalysis

Journal of Electroanalytical Chemistry, Год журнала: 2025, Номер 981, С. 118958 - 118958

Опубликована: Янв. 26, 2025

Язык: Английский

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