High entropy catalysts in electrolytic water splitting: A review from properties to applications

Chemical Engineering Journal, Год журнала: 2024, Номер 498, С. 155736 - 155736

Опубликована: Сен. 12, 2024

Язык: Английский

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High‐Entropy Oxychalcogenide for Hydrogen Spillover Enhanced Hydrogen Evolution Reaction in Proton and Anion Exchange Membrane Water Electrolyzers

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 29, 2025

Abstract The hydrogen spillover phenomenon provides an expeditious reaction pathway via transfer from a strong H adsorption site to weak site, enabling cost‐efficient evolution (HER) analogous platinum with moderate energy. Here, high‐entropy oxychalcogenide (HEOC) comprising Co, Ni, Mo, W, O, Se, and Te is prepared by two‐step electrochemical deposition for spillover‐enhanced HER in acidic alkaline water electrolysis. anodic–cathodic reversal current enables the co‐deposition of cations aliovalent anions, facilitating glass structure multiple active sites spillover. HEOC exhibits low overpotentials 52 57 mV obtain density 10 mA cm −2 media, respectively, long‐term stability 500 h. analytical approaches elucidate toward Mo/W−O both acid HERs. Meanwhile, other act as or dissociation‐derived hydroxide sites, showing accommodable behavior media. practically high 1 A at cell voltages 1.78 1.89 V 100 h proton anion exchange membrane electrolyzers, respectively.

Язык: Английский

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Nd-Doped MoS₂Nanosheets with Sulfur Vacancies as Catalysts for Hydrogen Evolution

ACS Applied Nano Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 8, 2025

A key challenge in the field of hydrogen evolution reaction (HER) is to develop catalysts that not only perform well pure alkaline conditions but also maintain high efficiency simulated seawater, which poses additional complexities due presence salts. This study introduces Nd-doped MoS2 nanosheets on carbon cloth (Mo1–xNdxS2⊥CC) as a high-performance electrocatalyst tailored for HER both saltwater and water. The optimized catalyst demonstrates an exceptional overpotential 112 mV at current density 10 mA/cm2, significantly lower than 235 exhibited by pristine under same conditions. Density functional theory (DFT) calculations experimental data indicate Nd doping enhances catalytic performance creating oxophilic sites improve water adsorption dissociation, modulating electronic structure accelerate Volmer Heyrovsky kinetics. Additionally, sulfur vacancy (Sv) further strengthens interaction between S, enhancing activation lowering dissociation barrier. maintains over 95% its initial activity after 48 h operation underscoring excellent stability effectiveness. These advancements design address pressing need robust variable electrolytes underscore broader applicability metal-doped other transition metals like Ru, Mn, Fe, potentially across diverse operational environments.

Язык: Английский

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Testing of NiO–Al2O3–CoO–MnO2 composite catalysts for indoor water splitting through electrocatalysis

Journal of Materials Science, Год журнала: 2025, Номер unknown

Опубликована: Янв. 14, 2025

Язык: Английский

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Anthraquinone doped CoNi-MOF-74 composites as electrocatalysts for enhanced oxygen evolution reaction

Ionics, Год журнала: 2025, Номер 31(3), С. 2757 - 2769

Опубликована: Фев. 4, 2025

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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Unveiling the potential of rock-salt type high entropy oxides synthesized by green microwave irradiation method for excellent oxygen evolution reaction

Journal of Alloys and Compounds, Год журнала: 2025, Номер unknown, С. 178967 - 178967

Опубликована: Фев. 1, 2025

Язык: Английский

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Dynamic Ion-Regulated Oxygen Evolution Catalyst Surface Reconstruction

Inorganic Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Апрель 16, 2025

Transition metal-based electrocatalysts are active materials for the oxygen evolution reaction (OER). However, their activities depend heavily on in situ reconstructed new catalytic layer, which severely curtails rational design and screening of well-defined during synthesis stage. Here, we present a method to deliberately catalyst layer by adding small amount Fe3+ ions electrolyte. We investigated effect reconstruction process NiCuOxHy subsequent contribution activity. The presence promotes formation with fewer vacancies. This structural feature allows fast charge active-species transfer near layer. Moreover, Fe3+-ion-regulated has suitable electronic configuration intermediate adsorption, thus reducing kinetics. With assistance trace ions, an increase current density up 54.2% can be achieved. electrolyte concentration saved 50% (0.5 M) while maintaining 150 mA cm-2. work provides insights into ion-catalyst correlation surface offers guidance efficient OER electrocatalysts.

Язык: Английский

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A spinel based high entropy oxide (Co, Fe, Mn, Ni, Li)3O4 and reduced graphene oxide composite anode for seawater electrolysis

International Journal of Hydrogen Energy, Год журнала: 2025, Номер 130, С. 54 - 63

Опубликована: Апрель 24, 2025

Язык: Английский

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Efficient and stable La2O3/MoS2 hetero-nanosheet architecture as bifunctional catalysts for seawater electrolysis

International Journal of Hydrogen Energy, Год журнала: 2025, Номер 130, С. 373 - 380

Опубликована: Апрель 27, 2025

Язык: Английский

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