Arming Amorphous NiMoO₄ on Nickel Phosphide Enables Highly Stable Alkaline Seawater Oxidation

Small, Год журнала: 2024, Номер 20(31)

Опубликована: Март 3, 2024

Abstract Seawater electrolysis holds tremendous promise for the generation of green hydrogen (H 2 ). However, system seawater‐to‐H faces significant hurdles, primarily due to corrosive effects chlorine compounds, which can cause severe anodic deterioration. Here, a nickel phosphide nanosheet array with amorphous NiMoO 4 layer on Ni foam (Ni P@NiMoO /NF) is reported as highly efficient and stable electrocatalyst oxygen evolution reaction (OER) in alkaline seawater. Such /NF requires overpotentials just 343 370 mV achieve industrial‐level current densities 500 1000 mA cm −2 , respectively, surpassing that P/NF (470 555 mV). Furthermore, it maintains consistent over h, improvement compared (120 h) Ni(OH) (65 h). Electrochemical situ Raman spectroscopy, stability testing, chloride extraction analysis reveal formed MoO 2− /PO 3− from during OER test electrode surface, thus effectively repelling Cl − hindering formation harmful ClO .

Язык: Английский

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Synthesis of polymetallic oxide nanoarrays as efficient hydrogen evolution reaction electrocatalyst for alkaline seawater and urea splitting

Fuel, Год журнала: 2024, Номер 372, С. 132281 - 132281

Опубликована: Июнь 21, 2024

Язык: Английский

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Strain Engineering of High-Entropy Oxides Enriches Highly Active Lattice Oxygen for Electrocatalytic Water Oxidation

ACS Materials Letters, Год журнала: 2024, Номер 6(5), С. 1739 - 1745

Опубликована: Апрель 2, 2024

Developing novel high-entropy oxide electrocatalysts for oxygen evolution is a promising strategy to accelerate the alkaline water electrolysis kinetics by optimizing reaction paths. Herein, we demonstrate high-strain senary (FeCoNiCrMnCu)3O4 electrocatalyst with remarkably increased highly active lattice oxygen, which follows lattice-oxygen-mediated mechanism instead of traditional adsorbate-evolution (OER). A supersmall overpotential 241.4 mV required obtain 10 mA cm–2 and considerable current retention rate 94.9% attained after continuously operating 72 h. The diffusion coefficient 1.97 × 10–14 cm2 s–1, 5.6 times larger than (FeCoNi)3O4, ensuring rapid replenishment during oxidation. OER activity surpasses those most reported spinel electrocatalysts. More impressively, assembled anion exchange membrane electrolyzer can deliver an industrial-level density 1.0 under cell voltage 1.79 V, exhibiting attractive application potential.

Язык: Английский

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Special atmosphere annealed Co3O4 bifunctional catalysts with oxygen defects for high-efficient water splitting

Applied Surface Science, Год журнала: 2024, Номер 657, С. 159839 - 159839

Опубликована: Март 6, 2024

Язык: Английский

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Non‐Noble‐Metal‐Based Electrocatalysts for Acidic Oxygen Evolution Reaction: Recent Progress, Challenges, and Perspectives

Small, Год журнала: 2024, Номер 20(48)

Опубликована: Авг. 25, 2024

Abstract The oxygen evolution reaction (OER) plays a pivotal role in diverse renewable energy storage and conversion technologies, including water electrolysis, electrochemical CO 2 reduction, nitrogen fixation, metal‐air batteries. Among various electrolysis techniques, proton exchange membrane (PEM)‐based devices offer numerous advantages, high current densities, exceptional chemical stability, excellent conductivity, high‐purity H . Nevertheless, the prohibitive cost associated with Ir/Ru‐based OER electrocatalysts poses significant barrier to broad‐scale application of PEM‐based splitting. Consequently, it is crucial advance development non‐noble metal catalysis substance acid‐activity thereby fostering their widespread integration into PEM electrolyzers (PEMWEs). In this review, comprehensive analysis acidic mechanism, encompassing adsorbate mechanism (AEM), lattice (LOM) oxide path (OPM) offered. Subsequently, systematic summary recently reported noble‐metal‐free catalysts transition metal‐based, carbon‐based other types provided. Additionally, compilation situ/operando characterization techniques provided, serving as invaluable tools for furnishing experimental evidence comprehend catalytic mechanism. Finally, present challenges future research directions concerning precious‐metal‐free are comprehensively summarized discussed review.

Язык: Английский

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Unfolding the Electrocatalytic Efficiency of Ultrastable CoFeLDH Nanorods by Creating Oxygen Vacancies for OER

ACS Applied Energy Materials, Год журнала: 2024, Номер 7(3), С. 1027 - 1036

Опубликована: Янв. 12, 2024

Harnessing the potential of oxygen vacancies (Ov) in metal oxides presents a promising avenue for expediting reaction kinetics water oxidation. In this context, layered double hydroxides (LDH) offer versatile platform developing cost-effective electrocatalysts with exceptional performance, thanks to their distinctive lamellar morphology. study, we unveil augmented electrochemical efficiency CoFeLDH by deliberately inducing an optimal vacancy under ambient conditions evolution (OER). The transformation nanorods (CoFeLDH) into Ov-rich (CoFeLDH-Ov) takes place through chemical reduction process at room temperature. effect Ov within catalyst is substantiated qualitative analyses, such as X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), and electron paramagnetic resonance (EPR). resulting catalyst, CoFeLDH-Ov, exhibits overpotential 220 mV current density 30 mA/cm2 1 M KOH electrolyte, indicating enhanced electroactivity when compared (without defects). also reveals excellent stability more than 500 h higher 50 mA/cm2. To validate catalyst's conducive nature, functional theory (DFT) calculations are performed, revealing iron (Fe) prominent active site catalyst. By means comprehensive experimental theoretical substantial influence on electronic structure LDH system demonstrated, which, turn, facilitates facile charge transfer strengthens

Язык: Английский

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Controlled synthesis of M doped NiMoO4 (M = Co, Cu and Fe) for urea, freshwater and seawater oxidation reaction

Fuel, Год журнала: 2024, Номер 371, С. 132050 - 132050

Опубликована: Июнь 1, 2024

Язык: Английский

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Interface engineering: Enhancing the electrocatalytic activity of heterostructure NiFe-based alloy over valorized carbon waste towards water splitting

International Journal of Hydrogen Energy, Год журнала: 2025, Номер 101, С. 556 - 567

Опубликована: Янв. 2, 2025

Язык: Английский

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Industrial-scale efficient alkaline water electrolysis achieved with sputtered NiFeV-oxide thin film electrodes for green hydrogen production

Journal of Materials Chemistry A, Год журнала: 2023, Номер 12(1), С. 460 - 474

Опубликована: Ноя. 22, 2023

To mitigate electrocatalyst peel-off under high current conditions, sputtering technology is employed to craft bifunctional films, specifically ternary NiFeV-oxide films with varied V compositions for enabling comprehensive alkaline water splitting in industrial applications.

Язык: Английский

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Controlled synthesis of NiFeCr-S/Ni3S2 as efficient hydrogen evolution catalyst for seawater splitting and urea splitting

Fuel, Год журнала: 2024, Номер 368, С. 131660 - 131660

Опубликована: Апрель 7, 2024

Язык: Английский

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