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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High entropy layered double hydroxide supported by multiwall carbon nanotube for oxygen evolution reactions (OER)

Journal of Power Sources, Год журнала: 2025, Номер 640, С. 236665 - 236665

Опубликована: Март 18, 2025

Язык: Английский

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Etching Accelerates Reconstruction and Activates Lattice Oxygen of Anion Vacancies‐Enriched Cobalt‐Iron Phosphide/(Oxy)Hydroxide Nanohybrid Frameworks for Enhanced Oxygen Evolution

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 14, 2025

Abstract Transition metal phosphides (TMPs) nanostructures are considered to be promising pre‐catalysts for electrochemical oxygen evolution reaction (OER). Nonetheless, most TMPs only experience limited surface reconstruction during OER, resulting in fewer active layer, insufficient sites and thus unsatisfactory performance. Thereby, finely control the level is crucial but still challenging. Here, Co 0.7−x Fe 0.3−y P/Co x y OOH nanohybird frameworks with numerous crystalline/amorphous interfaces fabricated by alkali etching of hollow crystalline 0.7 0.3 P nanocubes, leading in‐situ growth amorphous nanosheets subunits. Such nanohybrid own abundant phosphorus vacancies, optimal interface electronic structure, hydrophilic character, which manifest exceptional OER performance overpotential 256 mV reach 10 mA cm −2 current alkaline media, exceeding 1−x OOH, 1−y P/Fe P, IrO 2 , reported unprecious‐metal‐based catalysts. As revealed series ex‐situ spectroscopic analyses, formation anion defects phase promote deep such catalyst, triggering lattice participation synergy adsorbate mechanism toward OER. This work may spur development TMPs‐based catalysts integrating defect, engineering via facile etching, their applications water splitting or other clean energy options.

Язык: Английский

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Self-supported low-crystallinity CoFe layered double hydroxide nanospheres on monolayer Ti3C2 electrode for oxygen evolution reaction

Journal of Alloys and Compounds, Год журнала: 2024, Номер 992, С. 174614 - 174614

Опубликована: Апрель 23, 2024

Язык: Английский

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Self-Supported Low-Crystallinity Cofe Layered Double Hydroxide Nanospheres on Monolayer Ti3c2 Electrode for Oxygen Evolution Reaction

Опубликована: Янв. 1, 2024

The electrocatalytic oxygen evolution reaction is a crucial means to support the conversion and storage of sustainable renewable energy. Low-crystallinity can offer short-range structural ordering high active site density. In this work, an efficient self-supported OER electrocatalyst, CoFe/Ti3C2/NF heterostructure anode was prepared using electrodeposition. exceptional performance ensured by in situ decorating monolayer Ti3C2/NF with low-crystallinity CoFe nanosphers. By harnessing low crystallinity, well-chosen composition reasonable heterostructure, overpotential decreases 246 mV at current density 10 mA·cm-2 alkaline media. After 3000 CV cycles, ignorable increase 14 suggest excellent long circular stability. Moreover, accelerated kinetics implied smaller Tafel slope (42.53 mV·dec-1) higher double-layer specific capacitance (3.94 mF·cm-2), which surpassed counterparts CoFe/NF s-Ti3C2/NF. This work paves new way fabricate materials for electrocatalysis energy storage.

Язык: Английский

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High Entropy Layered Double Hydroxide Supported by Multiwall Carbon Nanotube for Oxygen Evolution Reactions (Oer)

Опубликована: Янв. 1, 2024

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Язык: Английский

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