CeO₂ Nanoparticles Anchored in Cation-Vacancies NiFe-LDH toward Efficient Oxygen Evolution Reactions in Green Sustainable Seawater Electrolysis

ACS Sustainable Chemistry & Engineering, Год журнала: 2024, Номер 12(31), С. 11628 - 11637

Опубликована: Июль 21, 2024

In recent decades, there has been significant interest in eco-friendly hydrogen production from seawater electrolysis. However, the corrosive nature of Cl– on metal substrates prevents Ni–Fe layered hydroxides (NiFe-LDH) being catalysts for direct use this study, a NiFe-LDH attached to copper nanowire arrays with synergistic decoration cerium dioxide (CeO2) nanoparticles and cationic defects was synthesized. It requires only 208 230 mV overpotentials under 1 M KOH alkali wild 100 mA·cm–2. Moreover, catalyst is capable functioning at 400 mA·cm–2 natural seawater, retention rate 99% 80 h. Results theoretical experimental analyses indicate that Ce–O–Ni unit formed by cation anchoring CeO2 particles promotes charge transfer CeO2, which greatly reduces adsorption energy OER active intermediates. The hard soft acid-based (HSAB) theory states selective binding OH– high-valence Ni responsible improvement stability selectivity. This research aims outline key considerations developing high-efficiency electrolysis catalysts.

Язык: Английский

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Nanostructured MoSe₂/NiSe₂ Electrocatalysts with Heterojunctions for Hydrogen Evolution Coupling Urea Oxidation

ACS Applied Nano Materials, Год журнала: 2024, Номер 7(10), С. 12091 - 12100

Опубликована: Май 7, 2024

Developing highly efficient and low-cost hydrogen evolution reaction (HER) electrocatalysts is an urgent important task for development of green water electrolysis production technology. In this work, the nanostructured MoSe2/NiSe2 electrocatalyst with heterojunctions constructed by a two-step hydrothermal method HER coupling urea oxidation (UOR). The presence accelerates charge transfer enhances conductivity electrocatalysts; thus, as-prepared exhibits bifunctional electrocatalytic activity. Low overpotentials 79 120 mV are required to achieve 10 mA cm–2 current density UOR, respectively. For two-electrode containing 1 M KOH 0.5 urea, voltage only 1.47 V deliver cm–2. Density functional theory (DFT) calculation results show that can optimize adsorption H* improve activity because existence heterostructure. This work provides promising potential designing energy-saving catalysts alternative electrode reactions.

Язык: Английский

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Highly Stable Bifunctional Heterostructured Electrocatalyst Integrated with LDPE‐Derived Spherical Carbon for Longevous Alkaline Seawater Splitting

Small, Год журнала: 2025, Номер unknown

Опубликована: Март 24, 2025

Abstract The development of innovative electrocatalysts for seawater splitting shows great potential large‐scale green energy. Specifically, interface engineering plays a vital role in improving surface properties and charge transfer. However, electrolysis encounters considerable challenges like chloride‐induced corrosion, impurities, microorganisms that hinder efficiency. Herein, we design highly durable electrocatalyst based on selenium‐enriched NiMn‐S x supported low‐density polyethylene‐derived spherical carbon‐Ni foam (Se‐NiMnS @SC/NF) using combination pyrolysis hydrothermal processes. resulting Se‐NiMnS @SC/NF bifunctional catalyst with hollow cycas cone structure exhibited exceptional electrochemical performance corrosion resistance alkaline an ultralow overpotential 146 262 mV the hydrogen evolution reaction (HER) oxygen (OER) to achieve large current density 500 mA cm⁻ 2 . In simulated setup, maintained cell voltage 2.07 V at , demonstrating outstanding durability over 100 h ≈100% Faradaic Se S doping heterostructured refines electronic boosts kinetics, while increases exposure active sites. Additionally, carbon layer provided strong making excellent electrolysis.

Язык: Английский

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Iron and oxygen vacancies co-modulated adsorption evolution and lattice oxygen dual-path mechanism for enhanced ampere-level freshwater/seawater oxidation

Research Square (Research Square), Год журнала: 2025, Номер unknown

Опубликована: Апрель 14, 2025

Conjointly activating metal and lattice oxygen sites to trigger the adsorbate evolution mechanisms coupled path holds promise for balancing activity stability in reaction (OER) catalysts, yet confronting significant challenges. Herein, we develop Fe species vacancies co-regulated Ni-(oxy)hydroxide (O_V-Ni(Fe)OOH), derived from deep reconstruction of Fe-Ni₂P/NiMoO₄ pre-catalyst during OER, which realizes AEM-LOM dual-path mechanism with optimal metal-oxygen covalent bonds, as confirmed via in-situ mass/spectroscopy spectrometry chemical probes. Experimental details theoretical calculation analysis reveals enhanced AEM kinetics on Ni site co-regulation O_V, featuring upshifted 3d band centers, while incorporation activates O preferable adsorption free energy LOM intermediates. Benefiting mechanism, activated catalyst affords an ampere-scale current density 1.0 A cm^{− 2} at low overpotentials 275 299 mV 1 M KOH + seawater, respectively, maintains seawater electrocatalysis 480 h anion exchange membrane water electrolysis (AEMWE) cell. This work demonstrates a strategy OER efficient stable electrocatalytic splitting under harsh conditions.

Язык: Английский

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A nanocrystalline La_0.6Sr_0.4Co_0.4Fe_0.6O_3−δ interlayer for an enhanced oxygen electrode–electrolyte interface in solid oxide cells

Journal of Materials Chemistry A, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

A catalytically active and intimate interface between the electrode electrolyte is crucial for performance of solid oxide cells (SOCs).

Язык: Английский

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Hexaminobenzene in conductive metal-organic frameworks as bifunctional electrocatalysts for overall water splitting and metal-air batteries

Journal of Power Sources, Год журнала: 2025, Номер 644, С. 237126 - 237126

Опубликована: Апрель 23, 2025

Язык: Английский

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Enhanced lanthanum and cerium removal of self-powered electro-membrane bioreactor (SPEMBR) using high-active bi-functional M-N-CNTs@Fe/Mo electrode

Chemical Engineering Journal, Год журнала: 2024, Номер 490, С. 151877 - 151877

Опубликована: Май 3, 2024

Язык: Английский

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Vanadium-Doped FeO/NiS Nanosheet Arrays: Synergistic Heterometal Doping and Heterostructure Design for Enhanced Oxygen Evolution Catalysis

Journal of Alloys and Compounds, Год журнала: 2024, Номер 1008, С. 176386 - 176386

Опубликована: Сен. 6, 2024

Язык: Английский

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Suppression of structural distortion in Vanadium-doped nickel MOFs for enhanced stability and activity in oxygen evolution reactions

International Journal of Hydrogen Energy, Год журнала: 2024, Номер 93, С. 374 - 386

Опубликована: Ноя. 2, 2024

Язык: Английский

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Effect of yttrium doping on the properties of Nickel-Iron multiphase heterostructures at high current conditions

Chemical Engineering Science, Год журнала: 2024, Номер unknown, С. 120859 - 120859

Опубликована: Окт. 1, 2024

Язык: Английский

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