Engineering MOF@LDH heterojunction with strong interfacial built-in electric field towards enhanced electrocatalytic water oxidation

Fuel, Год журнала: 2024, Номер 377, С. 132796 - 132796

Опубликована: Авг. 17, 2024

Язык: Английский

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Amorphous/Crystalline Phases Mixed Nanosheets Array Rich in Oxygen Vacancies Boost Oxygen Evolution Reaction of Spinel Oxides in Alkaline Media

Small, Год журнала: 2024, Номер 20(34)

Опубликована: Апрель 2, 2024

As promising oxygen evolution reaction (OER) catalysts, spinel-type oxides face the bottleneck of weak adsorption for oxygen-containing intermediates, so it is challenging to make a further breakthrough in remarkably lowering OER overpotential. In this study, novel strategy proposed substantially enhance activity spinel based on amorphous/crystalline phases mixed FeNi

Язык: Английский

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Linker Mediated Electronic‐State Manipulation of Conjugated Organic Polymers Enabling Highly Efficient Oxygen Reduction

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(26)

Опубликована: Апрель 19, 2024

Abstract Conjugated polymers with tailorable composition and microarchitecture are propitious for modulating catalytic properties deciphering inherent structure‐performance relationships. Herein, we report a facile linker engineering strategy to manipulate the electronic states of metallophthalocyanine conjugated uncover vital role organic linkers in facilitating electrocatalytic oxygen reduction reaction (ORR). Specifically, set cobalt phthalocyanine (CoPc‐CPs) wrapped onto carbon nanotubes (denoted CNTs@CoPc‐CPs) judiciously crafted via situ assembling square‐planar tetraaminophthalocyanine (CoPc(NH 2 ) 4 different linear aromatic dialdehyde‐based presence CNTs. Intriguingly, upon varying characteristic from terephthalaldehyde (TA) 2,5‐thiophenedicarboxaldehyde (TDA) then thieno/thiophene‐2,5‐dicarboxaldehyde (bTDA), their corresponding CNTs@CoPc‐CPs exhibit gradually improved ORR performance. More importantly, theoretical calculations reveal that charge transfer CoPc units electron‐withdrawing (i.e., TDA bTDA) drives delocalization Co d‐orbital electrons, thereby downshifting d‐band energy level. Accordingly, active centers more positive valence state optimized binding toward ORR‐relevant intermediates thus balanced adsorption/desorption pathway endows significant enhancement ORR. This work demonstrates molecular‐level route rationally designing efficient polymer catalysts gaining insightful understanding mechanisms.

Язык: Английский

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Two-Dimensional OER Catalysts: Is There a Win-Win Solution for Their Activity and Stability?

ACS Materials Letters, Год журнала: 2024, Номер unknown, С. 3602 - 3624

Опубликована: Июль 12, 2024

Язык: Английский

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Advances and challenges in MXene-based electrocatalysts: unlocking the potential for sustainable energy conversion

Materials Horizons, Год журнала: 2024, Номер 11(18), С. 4239 - 4255

Опубликована: Янв. 1, 2024

This review summarizes the design strategies of MXene-based catalysts for HER, OER, ORR and NRR, including surface modification, MXene lattice substitution, morphology, defect heterostructure engineering.

Язык: Английский

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Mesoporous graphene-supported nanostructured nickel telluride for efficient electrocatalytic oxygen evolution reaction

Fuel, Год журнала: 2024, Номер 374, С. 132439 - 132439

Опубликована: Июль 8, 2024

Язык: Английский

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Amorphous Ni(OH)₂ Coated Cu Dendrites with Superaerophobic Interface for Bipolar Hydrogen Production Assisted with Formaldehyde Oxidation

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 13, 2025

Abstract Since formaldehyde oxidation reaction (FOR) can release H 2 , it is attractive to construct a bipolar hydrogen production system consisting of FOR and evolution (HER). Although copper‐based catalysts have attracted much attention due their low cost high activity, the performance enhancement mechanism lacks in‐depth investigation. Here, an amorphous‐crystalline catalyst amorphous nickel hydroxide‐coated copper dendrites on foam (Cu@Ni(OH) /CF) prepared. The modification Ni(OH) resulted in hydrophilic aerophobic states Cu@Ni(OH) /CF surface, facilitating transport liquid‐phase species electrode surface accelerating . Open circuit potential (OCP) density functional theory (DFT) calculations indicate that this core–shell structure facilitates adsorption HCHO OH − In addition, catalytic pathway are investigated through situ FTIR DFT calculations, results showed lowered energy barrier for C─H bond breaking H─H formation. HER//FOR system, Pt/C//Cu@Ni(OH) provide current 0.5 A cm −2 at 0.36 V achieve efficient stable production. This work offers new ideas designing electrocatalysts assisted with oxidation.

Язык: Английский

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In-situ grown ternary metal hydroxides@3D oriented crumpled V2C MXene sheets for improved electrocatalytic oxygen evolution reaction

Heliyon, Год журнала: 2024, Номер 10(15), С. e35643 - e35643

Опубликована: Авг. 1, 2024

High valence multi transition metal hydroxides are greatly enriched with OER redox active sites due to strong synergy of heteroatomic nuclei. The efficiency these could be efficiently improved by coupling highly conductive substrate. advanced three-dimensional (3D) architecture and hydrophilic terminal functionalities MXene (MX) considerably enhance the maximum utilization rate anchored triggering direct growth at MX Here-in, freeze-dried 3D network crumpled Vanadium-Carbide (V2C) sheets regulates crystallization in-situ grown NiFeCr on scaffold through co-precipitation process. XPS results suggest a synergistic chemical interaction that modifies electronic structure composite ensuring reduced charge transfer resistance. Besides, as found in FESEM morphological investigation, well-dispersed multi-transition immobilized open pores like V2C-MX facilitate thoroughly accessible sites. As result, NiFeCr@3D has shown an excellent electrocatalytic activity overpotential 410 mV current density 200 mA cm−2, Tafel slope 100 dec 1M KOH. significant between metallic centers support prevent detachment or agglomeration providing electrolytic ions, quick ionic OH− transportation, speedy stable electron channels thus ensure long-term stability NV-5MX during 53 h continuous operation OER. Furthermore, we have utilized more accurate value half-cell standard reduction potential Hg/HgO electrode Nernst equation represent all test voltages determine values. In essence, this study features facile approach for confined presence morphologically unique V2C architectures. Consequently, increased reaction kinetics synthesized composites potentially interplay well dispersed

Язык: Английский

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Ultrafast Conversion of Water and Oxygen Molecules With Dissociation of Hydrogen Bonding Effect to Achieve Extra‐High Energy Efficiency of Secondary Metal‐Air Batteries

Small, Год журнала: 2024, Номер 20(46)

Опубликована: Авг. 8, 2024

Abstract Metal‐air secondary batteries with ultrahigh specific energies have received vast attention and are considered new promising energy storage. The slow redox reactions between oxygen‐water molecules lead to low efficiency (55–71%) limited applications. Herein, it is proposed that the MIL‐68(In)‐derived porous carbon nanotube supports CoNiFeP heteroconjugated alloy catalyst an overboiling point electrolyte achieve oxidation rate of water molecules. Structural characterization density functional theory calculations reveal greatly reduces free process, further accelerates dissociation O─H hydrogen bonds, release O 2 molecules, achieving extra‐low overpotential 110 mV@10 mA cm −2 far lower than commercial Ir/C catalysts 192 mV at 125 °C state‐of‐the‐art. Furthermore, assembled rechargeable zinc‐air begins break through 85 °C, jumps 100 reaches 88.1% ultralow decay 0.0068% after 150 cycles superior those reported metal‐air batteries. This work provides a joint‐design strategy reexamines battery operating temperature construct higher for fuel cells.

Язык: Английский

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Preparation of a branched hierarchical Co3O4@Fe2O3 core–shell structure with high-density catalytic sites for efficient catalytic conversion of nitrate in wastewater to ammonia

Chemical Engineering Journal, Год журнала: 2024, Номер 499, С. 156495 - 156495

Опубликована: Окт. 9, 2024

Язык: Английский

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