“One Stone, Two Birds”: Multi‐Element Doping Induced Crystallinity Modulation for Large Current Density Oxygen Evolution Reaction

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 23, 2025

Abstract Oxygen evolution reaction (OER) plays a critical role in water splitting, which can directly determine the energy consumption of hydrogen production. However, poor stability catalysts at large current density inhibits their industrial application. Therefore, development efficient with industry‐relevant activities still faces great challenges. Herein, one‐step corrosion strategy is reported for preparation multi‐element low‐crystal transition metal hydroxide (denoted as NiFeCrMnCo‐c). Density functional theory calculation indicates that doping improves conductivity catalyst and reduces barrier catalytic process. Only 259 303 mV overpotentials are required to achieve anodic densities 100 1000 mA cm −2 respectively, it work 50 300 h without apparent attenuation. Furthermore, when self‐assembled an anion exchange membrane electrolyzer, requires only 1.72 V splitting operates stably 60 °C, meet requirements The design OER simple preparation, high activity, provides new perspective practical splitting.

Язык: Английский

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Rapid Outgassing of Hydrophilic TiO2 Electrodes Achieves Long-Term Stability of Anion Exchange Membrane Water Electrolyzers

Nano-Micro Letters, Год журнала: 2025, Номер 17(1)

Опубликована: Март 13, 2025

Abstract The state-of-the-art anion-exchange membrane water electrolyzers (AEMWEs) require highly stable electrodes for prolonged operation. stability of the electrode is closely linked to effective evacuation H 2 or O gas generated from surface during electrolysis. In this study, we prepared a super-hydrophilic by depositing porous nickel–iron nanoparticles on annealed TiO nanotubes (NiFe/ATNT) rapid outgassing such nonpolar gases. NiFe/ATNT exhibited an overpotential 235 mV at 10 mA cm −2 oxygen evolution reaction in 1.0 M KOH solution, and was utilized as anode AEMWE achieve current density 1.67 A 1.80 V. addition, with electrode, which enables outgassing, showed record 1500 h 0.50 under harsh temperature conditions 80 ± 3 °C.

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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The synergistic effect of Ni–NiMo₄N₅ heterointerface construction and Fe-doping enables active and durable alkaline water splitting at industrial current density

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

Опубликована: Янв. 1, 2025

The synergistic effect of heterogeneous interfaces and doping optimizes electronic structure accelerates charge transfer, significantly boosting alkaline water electrolysis performance.

Язык: Английский

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Triggering the oxide path mechanism of oxygen evolution reaction: Introducing compressive strain on NiFe-LDH by partial replacement using Ba cations

Journal of Colloid and Interface Science, Год журнала: 2025, Номер unknown, С. 137329 - 137329

Опубликована: Март 1, 2025

Язык: Английский

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Doping Mo Triggers Charge Distribution Optimization and P Vacancy of Ni₂P@Ni₁₂P₅ Heterojunction for Industrial Electrocatalytic Production of Adipic Acid and H₂

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 1, 2025

Synchronous electrosynthesis of value-added adipic acid (AA) and H2 is extremely crucial for carbon neutrality. However, accomplishing the preparation AA at large current density with high selectivity still challenging. Herein, a robust Mo-doped Ni2P@Ni12P5 heterojunction more P vacancies on Ni foam proposed simultaneous electrooxidation cyclohexanol (CHAOR) to hydrogen evolution reaction (HER) density. Combined X-ray photoelectron spectroscopy, absorption fine structure, electron spin resonance confirm that Mo incorporation induces charge redistribution Ni2P@Ni12P5, where adjusts electrons from P, triggers vacancies. Further experimental theoretical investigations reveal d-band center upshifted, optimizing adsorption energies water electron-rich site boosting HER activity. Besides, Ni3+ generated electron-deficient induced by Mo, alongside OH* triggered concurrently promote CHA dehydrogenation C─C bond cleavage, decreasing energy barrier CHAOR. Consequently, two-electrode flow electrolyzer achieves industrial (>230 mA cm-2) 85.7% yield, 100% Faradaic efficiency production. This study showcases an bifunctional electrocatalyst production productivity.

Язык: Английский

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Obtaining materials from local sources: surface modification engineering enabled substrates for water splitting

Chemical Communications, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Substrate surface modification engineering is a novel method to prepare electrode and can be called self-derived reaction of substrates. Pristine substrates, such as foil, mesh, foam, react directly with modifying agents obtain electrode.

Язык: Английский

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Accelerating the Transformation of Active β‐NiOOH on NiFe Layered Double Hydroxide via Cation–anion Collaborative Coordination for Alkaline Water Oxidation at High Current Densities

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 7, 2025

Abstract The NiFe‐based layered double hydroxides (LDH) undergo surface reconstruction, generating metal hydroxyl oxides that act as active species during the alkaline oxygen evolution reaction (OER). However, sluggish reconstruction process and excessive oxidation at higher anodic potentials frustrate OER activity stability. Herein, a cation–anion collaborative coordination strategy is harnessed to build (Ni, Fe)─S─Zn structures in NiFe LDH on nickel foam (S‐NiFeZn LDH/NF), which lowers energy barrier aids forming highly β‐NiOOH process. Meanwhile, also optimize adsorption of oxygen‐containing intermediates, enhancing kinetics. As result, S‐NiFeZn LDH/NF achieves low overpotentials 201 mV 10 mA cm −2 293 500 1.0 m KOH. Moreover, cell assembled with anode commercial NiMo cathode demonstrates excellent overall water splitting activity, voltages 1.62 1.81 V KOH, exhibits ultralong‐term durability over h , even operating stably for 200 an electrolyzer under industrial conditions (30% KOH 80 °C).

Язык: Английский

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Hierarchical NiFe LDH/N-doped Co/Nickel foam as highly active oxygen evolution reaction electrode for anion exchange membrane water electrolysis

Nano Research, Год журнала: 2024, Номер 18(2), С. 94907190 - 94907190

Опубликована: Дек. 13, 2024

Язык: Английский

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Surface borate layer dramatically enhances the stability of NiFe-layered double hydroxide for alkaline seawater oxidation

Materials Today Physics, Год журнала: 2024, Номер 50, С. 101612 - 101612

Опубликована: Дек. 5, 2024

Язык: Английский

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