High electronegativity of Ag and P in high-entropy materials synergistically promotes efficient water electrolysis

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 105, P. 521 - 530

Published: Jan. 25, 2025

Language: Английский

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Structural Regulation Strategies of Atomic Cobalt Catalysts for Oxygen Electrocatalysis

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

Abstract Oxygen electrocatalysis is a core reaction in renewable energy devices, greatly promoting the transformation and upgrading of structure. Nonetheless, performance conversion devices hindered by large overpotential slow kinetics oxygen electrocatalytic reactions. Recently, single‐atom catalysts (SACs) have emerged as promising contenders field because their exceptional metal atom utilization, distinctive coordination environment, adjustable electronic properties. This review presents latest advancements design Co‐based SACs for electrocatalysis. First, OER ORR mechanisms are introduced. Subsequently, strategies regulating structure summarized three aspects, including centers, support carriers. A particular emphasis given to relationship between properties catalysts. Afterward, applications explored. Ultimately, challenges prospects prospected.

Language: Английский

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Integrating Ni2P crystalline-NiFeBP amorphous heterojunction nanosheets on hierarchical nickel foam for superior overall water splitting

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 159290 - 159290

Published: Jan. 1, 2025

Language: Английский

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3D‐Porous Electrocatalyst with Tip‐Enhanced Electric Field Effect Enables High‐Performance Proton Exchange Membrane Water Electrolyzer

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 13, 2025

Abstract Hydrogen evolution reaction (HER), as one of the most advanced methods for green production hydrogen, is greatly impeded by inefficient mass transfer. Here we present an efficiently reactant enriched and traffic system integrating high‐curvature Pt nanocones with 3D porous TiAl framework to enhance transfer rate. Theoretical simulations, in situ Raman spectroscopy potential‐dependent Fourier transform infrared results disclose that strong local electric field induced can promote H 3 O + supply rate during HER, resulting ∼1.6 times higher concentration around nanocone than electrolyte. X‐ray computed tomography molecular dynamic simulation demonstrate diffusion coefficient surpasses commercial carbon support more 16.7 times. Consequently, Pt/TiAl‐nanocone exhibits a high activity 17.2 mA cm −2 at overpotential 100 mV ultrahigh TOF value 42.9 atom −1 s . In proton exchange membrane water electrolyzer, cathode achieves industrial‐scale current density 1.0 A cell voltage 1.88 V 60 °C operate stably least 800 h sluggish decay 137 µV

Language: Английский

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Gd‐Induced Oxygen Vacancy Creation Activates Lattice Oxygen Oxidation for Water Electrolysis

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 26, 2025

Abstract As a key reaction in water electrolysis and fuel cells, the oxygen evolution (OER) involves sluggish four‐electron proton transfer process. Understanding OER pathways kinetics is critical for designing efficient electrocatalysts. In this study, through density functional theory (DFT) calculations, it demonstrated that incorporation of Gd into Fe‐doped NiO elevates O 2 p band center generates more unoccupied states. Furthermore, promotes formation vacancies, which, together, enhance lattice oxidation mechanism (LOM) pathway OER. The adsorption‐free energy diagrams confirm doping significantly lowers theoretical overpotentials at both Fe Ni sites NiO, thereby improving activity. Based on these findings, co‐doped ultrathin nanosheets are synthesized via spray combustion. an catalyst, material exhibited low overpotential 227 mV, which 40 mV lower than long‐term catalytic stability over 150 h. anion exchange membrane system, stable performance 120 h current 20 mA cm −2 .

Language: Английский

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Interfacial Fe-O-Ni bonding regulates built‐in electric field in Fe3O4@Ni(OH)2 heterogeneous catalysts for full water splitting

Journal of Power Sources, Journal Year: 2025, Volume and Issue: 641, P. 236864 - 236864

Published: March 26, 2025

Language: Английский

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Integrated electrode design based on metal–organic frameworks for anion exchange membrane electrolyzers under high current densities

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: unknown, P. 137506 - 137506

Published: April 1, 2025

Language: Английский

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A designed hierarchical porous Cu–Ni/Ni–Cu alloy converted from commercial nickel foam as versatile electrocatalysts for efficient and extremely stable water splitting

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: unknown, P. 137565 - 137565

Published: April 1, 2025

Language: Английский

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Interfacial-Free-Water-Enhanced Mass Transfer to Boost Current Density of Hydrogen Evolution

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: April 14, 2025

The advancement of water electrolysis highlights the growing importance electrolyzers capable operating at high current densities, where mass transfer dynamics plays a crucial role. In electrode reactions, interfacial is key factor in regulating these dynamics. However, potential utilizing interfacial-free (IFW) to modulate behavior remains underexplored. Herein, we investigate effect structure on hydrogen evolution reaction (HER) performance across different density ranges, using designed platinum-coated nickel hydroxide foam (Pt@Ni(OH)2-NF) electrodes. We reveal that with increasing density, changes alter rate-determining step HER. Pt@Ni(OH)2-NF exhibited excellent alkaline electrolytes, achieving 1000 mA cm-2 114 mV overpotential. This study provides novel approach optimizing by enhancing transfer, further paving way for more efficient and energy-saving production.

Language: Английский

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Scalable Fe‐Rich Corroded Steel Wool Electrodes for Industrial Anion Exchange Membrane Water Electrolysis with a Two‐Order‐of‐Magnitude Cost Reduction

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 24, 2025

Abstract Alkaline‐based anion exchange membrane water electrolysis (AEMWE) plays a crucial role in sustainable hydrogen production. However, conventional electrode designs rely on expensive nickel‐based materials and complex fabrication processes, limiting their scalability. This study presents cost‐effective scalable approach that transforms ultralow‐cost steel wool into freestanding electrodes for industrial‐scale AEMWE. The fibrous structure, anchoring an activated nickel–iron layered double hydroxide catalyst, enables highly active bifunctional electrode, achieving 1 A cm⁻ 2 at 1.815 V with ultralow degradation rate of ≈0.041 mV h⁻¹ over 1800 h. Unlike electrodes, the interwoven matrix eliminates need porous transport layers forms interlocking interface membrane, significantly enhancing performance durability. Under industrial conditions, prototype AEMWE single stack (≈16 cm ) delivers 16 1.8 nearly 30 2.0 V, maintaining stable operation 400 h under dynamic conditions. iron‐rich system, based one‐pot corrosion process, upcycling mass‐produced m scale cost 4.59 USD m⁻ , 200 times cheaper than electrodes. These findings establish new paradigm cost‐efficient durable design applications.

Language: Английский

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