Engineering Ruthenium Species on Metal–organic Frameworks for Water Electrolysis at Industrial Current Densities

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

Published: Dec. 11, 2024

Abstract Developing highly active and stable electrocatalysts for hydrogen production at industrial current densities is pivotal to give an impetus carbon neutrality. Recently, metal–organic frameworks (MOFs) with large surface area adjustable structures have become a class of promising alternative electrocatalysts, while their low conductivity poor stability limit widespread applications. Here, modified strategy proposed stabilize modulate Ruthenium (Ru) species including Ru single atoms (Ru SAs) nanoparticles NPs) on MOFs enhanced evolution reaction (HER). Benefiting from the strong interaction between MOFs, synthesized NiFeRu SA+NP ‐DOBDC (DOBDC: 2,5‐dioxido‐1,4‐benzenedicarboxylate) exhibits extraordinary HER performance overpotentials 25 271 mV 10 1000 mA cm −2 , respectively. Meanwhile, it enables robust high density 1 A over 300 h. Remarkably, assembled anion exchange membrane (AEM) electrolyzer realizes voltage alkaline water electrolysis. In situ analyses demonstrate that optimized H 2 O adsorption dissociation, theoretical calculations indicate SAs NPs accelerate Volmer‐Heyrovsky pathway, synergistically promoted performance. This work presents competitive integrate supported metal platform efficiently drive

Language: Английский

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Stable High-Entropy Alloy AlCoCrFeNi_2.1 with Anti-Dealloying Effect for Enhanced Oxygen Evolution Performance

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: March 13, 2025

The catalytic performance of oxygen evolution reaction (OER) catalysts is influenced by their elemental composition. Aluminum (Al) offers abundant active sites due to its high oxidation affinity, which makes it unstable in both acidic and alkaline environments. We used the gas atomization method (GAM) prepare aluminum-containing single-phase high-entropy alloy AlxCoCrFeNi2.1 (x = 0, 0.1, 0.3, 0.5, 1). Besides, changing aluminum content HEAs can control particle size. GAM enable with different Al contents present body-centered cubic (BCC) structure, avoiding phase separation caused other component smelting method. As predicted theory, as increases, AlCoCrFeNi2.1 shows best OER (overpotential ≈313 mV for 1000 h at 100 mA·cm–2). Furthermore, through precise weight detection system, COMSOL simulations, Density Functional Theory (DFT) calculations, we have further demonstrated superiority catalysis. Overall, this work provides a streamlined way slow down dissolution water electrolysis contributes controllable choice more element-dependent scenarios.

Language: Английский

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Interfacial Bridge Bonds Induced Strong Electronic Coupling of Co@V‐WO_x Catalyst for Enhanced Concurrent Co‐Electrolysis Performance

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

Published: March 27, 2025

Abstract The integration of the hydrogen evolution reaction (HER) with glycerol oxidation (GOR) presents a promising strategy for production high‐value chemicals. Herein, strongly electronically coupled Co@V‐WO x material is presented an amorphous nanosheet morphology, synthesized via one‐step electrodeposition method. Experimental and theoretical investigations reveal that V doping induces robust electronic interactions between Co V‐WO host through formation Co─O─V/W interfacial bridge bonds, enhancing electron transfer capability superior activity. As result, catalyst achieves exceptionally low potential −102 mV 1.32 at 100 mA cm⁻ 2 , along remarkable Faradaic efficiency 95.4% formate 1.40 V. A two‐electrode electrolyzer based on demonstrates ≈100% evolution, exceeding 92.8% rate 59.4 mg h⁻¹ formate, as well outstanding stability over 300 h surpassing those previously reported Co‐based electrocatalysts. in situ spectroscopic analyses simulations further confirm facilitates kinetics by promoting active species key intermediates while lowering energy barriers electrolysis.

Language: Английский

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Electrocatalytic hydrogen evolution performance of RuO2 nanorods grown on top of WO3 nanotube arrays

Published: April 3, 2025

Water electrolysis has been deemed as a simple, safe, and clean way to realize sustainable hydrogen production. However, efficacious water for production is highly dependent on efficient stable electrocatalysts. Herein, we report nanorod/nanotube array composite electrocatalyst toward evolution reaction (HER) in both basic acidic electrolytes. For the composite, One-dimensional RuO₂ nanorods (NRs) were grown top of WO₃ nanotube arrays (NTA) through facile solution impregnation method followed by high-temperature calcination. The obtained NRs/WO₃ NTA demonstrates superb electrocatalytic activity HER medias. To achieve current density 10 mA cm^{− 2}, required overpotentials are 33 mV 1 M KOH 62 0.5 H₂SO₄, respectively. Furthermore, also shows an excellent long-term electrochemical stability alkaline superior most reported RuO₂-based Ru-based electrocatalysts, even comparable state-of-the-art Pt/C catalyst. could be attributed structural merits including large surface area with abundant catalytically active sites, specific charge transport channel ensuring enhanced kinetics favorable bubble formation release. present work sheds new light designing novel one-dimensional structures generation. Simultaneously, designed structure this expected applied other energy conversion devices.

Language: Английский

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Regulating the protecting ligand content on Pt cluster surface for highly efficient electrocatalytic hydrogen evolution reaction

Applied Surface Science, Journal Year: 2025, Volume and Issue: unknown, P. 163129 - 163129

Published: April 1, 2025

Language: Английский

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Bridged Mn─O─Ru Motifs in RuO₂ Catalyst Promoting Hydrogen Production at Ampere‐Level Current Density

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

Published: April 26, 2025

Abstract Accurately regulating the reactive sites of catalysts is vital for highly efficient catalytic processes but still faces considerable challenges. In view this, a local oxidation‐state asymmetric Mn‐O‐Ru bridged moiety developed by introducing Mn atoms into RuO 2 host. The synergistic effect respective active on microstructure ensures its excellent alkaline HER performance. Theoretical calculations profiled that induced moiety, water dissociation ability Ru significantly boosted, while bridging oxygen exhibits optimal hydrogen adsorption free energy. As predicted, Mn‐RuO catalyst achieved overpotentials as low 118 and 160 mV at industrial level current densities 1 A cm ‒2 in m KOH, respectively, superior to commercial Pt/C catalyst. Such electrocatalyst can operate stably with long lifetime 300 h 10 mA under conditions. Furthermore, it only requires 1.87 V reach density 1.0 when serving cathode an assembled flow cell. This work provides new insight environment design obtaining ideal electrocatalysts.

Language: Английский

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Single‐Site Mn‐Doped Ru/RuO₂ Heterostructure for Acidic Overall Water‐Splitting

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

Published: Dec. 19, 2024

Abstract Acidic overall water‐splitting driven by consistent electricity is an efficient and economical method for producing green hydrogen. However, developing highly active durable bifunctional electrocatalysts both hydrogen oxygen evolution reactions (HER OER) in acidic conditions remains a challenge. Here, single‐atom Mn sites are introduced into Ru/RuO₂ heterostructures (Mn(SAs)‐Ru/RuO 2 ) as electrocatalysts, achieving low overpotentials of 39 158 mV at 10 mA cm −2 HER OER, respectively, while maintaining long‐term durability over 500 h 1.47 V 0.5 m H SO 4 . It outperforms most previously reported electrocatalysts. Theoretical calculations show that the charge redistribution caused single‐site dopants optimizes adsorption OOH * Ru sites, significantly boosting electrochemical kinetics OER HER. This work presents effective metal doping strategy to optimize distribution water‐splitting.

Language: Английский

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