Self‐integration exactly constructing oxygen‐modified MoNi alloys for efficient hydrogen evolution

EcoEnergy, Год журнала: 2023, Номер 1(2), С. 425 - 436

Опубликована: Дек. 1, 2023

Abstract Introducing oxygen atoms into nickel‐based alloys is an effective strategy for constructing water dissociation sites hydrogen evolution reaction (HER). However, controlling content to realize the best match of and adsorption challenging. Herein, we exploit self‐integration process MoNi alloy in molten salts introduce atoms, which ultimately leads localized generation robust NiO x H y around alloys. Interestingly, Mo further doped (Mo‐NiO ) construct active center due high mobility ionic solutions. Owing covering space confinement salt, exactly decorated with Mo‐NiO nanosheets. Both physical characterization density functional theory calculation prove that electron transport, capability, are finely tuned benefited from O doping, thus greatly expediting HER kinetics. exhibits a much lower overpotential 33 mV at 10 cm −2 alkaline electrolyte, even superior Pt/C benchmark. Moreover, final requires low 57 acidic media. This enhancement ascribed successful assembly foam elicited by salt.

Язык: Английский

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Designing 3d Transition Metal Cation-Doped MRuO_x As Durable Acidic Oxygen Evolution Electrocatalysts for PEM Water Electrolyzers

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(22), С. 15515 - 15524

Опубликована: Май 24, 2024

The continuous dissolution and oxidation of active sites in Ru-based electrocatalysts have greatly hindered their practical application proton exchange membrane water electrolyzers (PEMWE). In this work, we first used density functional theory (DFT) to calculate the energy Ru 3d transition metal-doped MRuOx (M = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn) evaluate stability for acidic oxygen evolution reaction (OER) screen out ZnRuOx as best candidate. To confirm theoretical predictions, experimentally synthesized these materials found that indeed displays robust OER with a negligible decay η10 after 15 000 CV cycles. Of importance, using anode, PEMWE can run stably 120 h at 200 mA cm–2. We also further uncover mechanism ZnRuOx, i.e., Zn atoms doped outside nanocrystal would form "Zn-rich" shell, which effectively shortened average Ru–O bond lengths strengthen interaction therefore boosted intrinsic OER. short, work not only provides new study paradigm DFT calculations guide experimental synthesis but offers proof-of-concept metal dopants RuO2 stabilizer universal principle develop high-durability catalysts PEMWE.

Язык: Английский

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Dual doping: An emerging strategy to construct efficient metal catalysts for water electrolysis

EcoEnergy, Год журнала: 2024, Номер 2(1), С. 114 - 140

Опубликована: Март 1, 2024

Abstract Developing efficient electrocatalysts for water electrolysis is critical sustainable hydrogen energy development. For enhancing the catalytic performance of metal catalysts, dual doping has attracted enormous interest its high effectiveness and facile realization. Dual effective tuning electronic properties, electrical conductivity, populating active sites, improving stability catalysts. In this review, recent developments in cation–cation, cation–anion, anion–anion dual‐doped catalysts splitting are comprehensively summarized discussed. An emphasis put on illustrating how regulates external internal properties boosts Additionally, perspectives pointed out to guide future research engineering high‐performance heteroatom‐doped electrocatalysts.

Язык: Английский

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Coupled amorphous NiFeP/cystalline Ni3S2 nanosheets enables accelerated reaction kinetics for high current density seawater electrolysis

Applied Catalysis B Environment and Energy, Год журнала: 2024, Номер 352, С. 124028 - 124028

Опубликована: Апрель 21, 2024

Язык: Английский

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Microwave‐Assisted PtRu Alloying on Defective Tungsten Oxide: A Pathway to Improved Hydroxyl Dynamics for Highly‐Efficient Hydrogen Evolution Reaction

Advanced Energy Materials, Год журнала: 2024, Номер unknown

Опубликована: Сен. 3, 2024

Abstract Platinum (Pt)‐based compounds are the benchmarked catalysts for hydrogen evolution reaction (HER) but exhibit slow kinetics in alkaline environments. The * OH accumulation on Pt surface can block active sites, affecting proton reduction and water re‐adsorption. Alloying Ruthenium (Ru) with sites significantly modulate adsorption desorption of dissociation intermediates. Choosing suitable supports utilizing metal‐support interaction (MSI) is crucial site optimization. PtRu alloy anchored tungsten oxide (WO 3 ) rich oxygen vacancies (O V prepared through an ultrafast microwave‐assisted approach. Benefiting from coupling effects between alloying MSI, PtRu/WO ‐O exhibits exceptionally high HER activity. In 1 m KOH, KOH + seawater, 0.5 H 2 SO 4 , it requires ultralow overpotentials 9, 26, 6 mV to achieve 10 mA cm −2 respectively. designed catalyst surpasses commercial Pt/C mass activity demonstrates considerable potential intermittent energy integration. Density functional theory reveals that Ru reduces barrier dissociating OH, modulating blockage then promoting overall process. This study offers insights into rapid synthesis non‐carbon supported modulation generation.

Язык: Английский

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Tuning d–p Orbital Hybridization of NiMoO₄@Mo₁₅Se₁₉/NiSe₂ Core‐Shell Nanomaterials via Asymmetric Coordination Interaction Enables the Water Oxidation Process

Advanced Energy Materials, Год журнала: 2024, Номер 14(20)

Опубликована: Апрель 3, 2024

Abstract The electrocatalytic performance of MoNi‐based nanomaterials undergo selenization has garnered significant interest due to their modified electronic structure, while still posses certain challenges for obtained bimetallic selenides. Here, a novel electrocatalyst NiMoO 4 @Mo 15 Se 19 /NiSe 2 core‐shell is constructed promote the desorption OOH * which can facilitate water oxidation process. nanoarrays show that “cores” are mainly nanorods “shells” selenides nanoflakes, super architectures expand more active sites and accelerate electron transfer. Moreover, hybridization interaction between Ni 3d, Mo 4d, 4p orbitals leads an asymmetric distribution electric clouds, decreases adsorption energy transformation oxygen‐containing species. Electrochemical data displays overpotentials only 195 mV, 220 224 mV oxygen evolution reaction (OER) in alkaline freshwater, simulated seawater, natural seawater. current density decay negligible after 100 h stability at about 1.46 V with three‐electrode system low cost unique this work provide constructive solution designing efficient stable OER catalysts future.

Язык: Английский

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Constructing built-in electric field to accelerate the asymmetric local charge distribution for efficient alkaline overall water/seawater splitting

Applied Catalysis B Environment and Energy, Год журнала: 2024, Номер 352, С. 124002 - 124002

Опубликована: Апрель 21, 2024

Язык: Английский

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Low-content Ru–Pt supported on oxygen vacancy enriched black TiO₂ with strong electronic interactions as efficient hydrogen generation electrocatalysts

Inorganic Chemistry Frontiers, Год журнала: 2024, Номер 11(17), С. 5508 - 5516

Опубликована: Янв. 1, 2024

Ultrafast quasi-solid microwave (60 s) is employed to achieve phosphorus-doped black TiO 2 supported Ru and Pt (Ru–Pt/P–TiO 2− x ) for the HER with an overpotential of 14 mV at 10 mA cm −2 in acidic electrolyte.

Язык: Английский

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Rationally Designed Mo/Ru‐Based Multi‐Site Heterogeneous Electrocatalyst for Accelerated Alkaline Hydrogen Evolution Reaction

Advanced Materials, Год журнала: 2024, Номер 36(48)

Опубликована: Окт. 6, 2024

The rational design of multi-site electrocatalysts with three different functions for facile H

Язык: Английский

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Efficient trifunctional electrocatalysts with iron single atoms electronically coupled with adjacent ruthenium nanoclusters for zinc-air battery-powered water splitting

Applied Catalysis B Environment and Energy, Год журнала: 2025, Номер 368, С. 125127 - 125127

Опубликована: Фев. 4, 2025

Язык: Английский

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