MoC_x/CoP Janus Structure Embedded Carbon Frame for Boosting Hydrazine Oxidation and Hydrogen Evolution Reactions

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 3, 2025

Abstract The integration of hydrazine electrooxidation (HzOR) and hydrogen evolution reaction (HER) presents an efficient pathway for high‐purity production. However, developing bifunctional catalysts remains challenging the demands multiple active‐centers tailored electronic properties. Here, a unique Janus nano‐catalysts MoC x /CoP embedded on carbon frameworks (MoC /CoP@C) is introduced, featuring dual states (depletion accumulation)driven by charge redistribution within /CoP, acting as active‐sites (DAS) both HER HzOR. Theoretical analysis reveals these independent DAS in significantly enhance catalytic activity Specifically, accumulated electrons at interfaces weaken bonding strength N‐H N 2 H 4 , thereby decreasing dehydrogenation energy barrier while electronic‐deficient Mo sites accelerate * desorption, thus promoting kinetics. This catalyst exhibits ultra‐low potential −73 mV 10 mA cm −2 anodic HzOR, comparable to noble low overpotential 95 cathodic HER. When employed overall splitting (OHzS) system, /CoP@C shows promising commercial potential, with consumption (0.16 V), high Faradaic efficiency (95.4%) long‐term stability. study underscores feasibility designing elucidates mechanistic origins activities.

Language: Английский

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Stabilizing bulk lattice oxygen via the enhancement of Ir/Ru–O bonds for stable oxidation catalysts in acidic media

Applied Catalysis B Environment and Energy, Journal Year: 2025, Volume and Issue: unknown, P. 125219 - 125219

Published: March 1, 2025

Language: Английский

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NiFe‐Based Electrocatalysts for Alkaline Oxygen Evolution: Challenges, Strategies, and Advances Toward Industrial‐Scale Deployment

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 2, 2024

Abstract Developing high‐efficiency alkaline water splitting technology holds great promise in potentially revolutionizing the traditional petrochemical industry to a more sustainable hydrogen economy. Importantly, oxygen evolution reaction (OER) accompanied at anode is considered as critical bottleneck terms of both complicated mechanism and sluggish kinetics, requiring rational design OER electrocatalysts elucidate structure‐performance relationship reduce applied overpotential. As benchmarked non‐precious metal candidate, NiFe‐based have gained enormous attention due low‐cost, earth‐abundance, remarkable intrinsic activity, which are expected be implemented industrial splitting. In this contribution, comprehensive overview provided, starting with fundamental mechanisms, evaluation metrics, synthetic protocols. Subsequently, basic principles corresponding regulatory strategies summarized following sequence substrate‐catalyst‐electrolyte efficient robust toward industrial‐scale deployment. Perspectives on remaining challenges instructive opportunities booming field finally discussed.

Language: Английский

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Phase regulation of Ni(OH)2 nanosheets induced by W doping as self-supporting electrodes for boosted water electrolysis

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 684, P. 1 - 10

Published: Jan. 4, 2025

Language: Английский

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Multidimensional sustainability implications of alternative iron and steel industry decarbonization strategies in China

Resources Conservation and Recycling, Journal Year: 2025, Volume and Issue: 215, P. 108136 - 108136

Published: Jan. 23, 2025

Language: Английский

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Enhanced Hydrogen Evolution Reaction Using Biomass-Activated Carbon Nanosheets Derived from Eucalyptus Leaves

Materials, Journal Year: 2025, Volume and Issue: 18(3), P. 670 - 670

Published: Feb. 3, 2025

Carbonaceous-based metal-free catalysts are promising aspirants for effective electrocatalytic hydrogen generation. Herein, we synthesized mesoporous-activated carbon nanosheets (ELC) from biomass eucalyptus leaves through KOH activation. The microstructure, structural, and textural characteristics of the prepared materials were characterized by FE-SEM, Raman, XRD, BET measurements. high temperature (700 °C) KOH-activated ELC exhibited an interconnected nanosheet morphology with a large specific surface area (1436 m2/g) mesoporosity. ELC-700 catalyst excellent HER performance low overpotential (39 mV at 10 mA/cm2), durability, Trivial Tafel slope (36 mV/dec) in 0.5 M H2SO4 electrolyte. These findings indicate new approach developing biomass-derived electrocatalysts substantially efficient green production.

Language: Английский

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Pt quantum dots coupled with NiFe LDH nanosheets for efficient hydrogen evolution reaction at industrial current densities

Microstructures, Journal Year: 2025, Volume and Issue: 5(2)

Published: Feb. 26, 2025

Developing efficient and economical electrocatalysts for hydrogen generation at high current densities is crucial advancing energy sustainability. Herein, a self-supported evolution reaction (HER) electrocatalyst rationally designed prepared on nickel foam through simple two-step chemical etching method, which consists of Pt quantum dots (PtQDs) coupled with nickel-iron layered double hydroxide (NiFe LDH) nanosheets (named PtQDs@NiFe LDH). The characterization results indicate that the introduction PtQDs induces more oxygen vacancies, thereby optimizing electronic structure LDH. This modification enhances conductivity accelerates adsorption/desorption kinetics intermediates in LDH, ultimately resulting exceptional catalytic performance HER large densities. Specifically, LDH delivers 500 2000 mA·cm-2 remarkably low overpotentials 92 252 mV, respectively, markedly outperforming commercial Pt/C (η500 = 190 η2000 436 mV). Moreover, when employing NiFe precursor catalyst as anode cathode, an overall water electrolysis system, only 1.66 V 2.02 are required to achieve mA·cm-2, while maintaining robust stability 200 h. study introduces feasible approach developing industrial-scale

Language: Английский

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Formamide-assisted synthesis of phosphate-intercalated Ni(OH)2/NiOOH electrode for boosting oxygen evolution reaction

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 689, P. 137209 - 137209

Published: March 1, 2025

Language: Английский

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

Nano-Micro Letters, Journal Year: 2025, Volume and Issue: 17(1)

Published: March 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.

Language: Английский

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Transition-metal-based hydrides for efficient hydrogen storage and their multiple bond analysis: A first-principles calculation

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 90, P. 1333 - 1343

Published: Oct. 11, 2024

Language: Английский

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