Three-dimensional porous NiCoP foam enabled high-performance overall seawater splitting at high current density

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(5), P. 2680 - 2684

Published: Jan. 1, 2024

Three-dimensional porous NiCoP foam supported on Ni is a superb bifunctional electrocatalyst for overall seawater splitting, attaining large current density of 1000 mA cm −2 at low cell voltage 1.97 V with robust stability over 300 hours.

Language: Английский

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Heteroanion induced structural asymmetricity centered on Ru sites switches the rate-determining step of acid water oxidation

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(5), P. 1885 - 1893

Published: Jan. 1, 2024

The intervening Se induces the structural asymmetricity of Ru-S 6 octahedrons and then regulates electronic structure active Ru site, which possesses excellent acid water oxidation performance as an Ir-free catalyst.

Language: Английский

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Effectiveness of strain and dopants on breaking the activity-stability trade-off of RuO2 acidic oxygen evolution electrocatalysts

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Feb. 17, 2025

Ruthenium dioxide electrocatalysts for acidic oxygen evolution reaction suffer from mediocre activity and rather instability induced by high ruthenium-oxygen covalency. Here, the tensile strained strontium tantalum codoped ruthenium nanocatalysts are synthesized via a molten salt-assisted quenching strategy. The spacially elongates bond reduces covalency, thereby inhibiting lattice participation structural decomposition. synergistic electronic modulations among strontium-tantalum-ruthenium groups both optimize deprotonation on sites intermediates absorption sites, lowering energy barrier. Those result in well-balanced activity-stability profile, confirmed comprehensive experimental theoretical analyses. Our electrode demonstrates an overpotential of 166 mV at 10 mA cm−2 0.5 M H2SO4 order magnitude higher S-number, indicating comparable stability compared to bare catalyst. It exhibits negligible degradation rates within long-term operation single cell PEM electrolyzer. This study elucidates effectiveness strain strategic doping enhancing ruthenium-based catalysts reactions. poor due authors report dopants improving stability.

Language: Английский

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In Situ Reconstructed Layered Double Hydroxides via MOF Engineering and Ru Doping for Decoupled Acidic Water Oxidation Enhancement

Energy & Fuels, Journal Year: 2024, Volume and Issue: 38(5), P. 4504 - 4515

Published: Feb. 7, 2024

Discovering cost-effective, durable, and economical electrocatalysts for the lattice oxygen- mediated mechanism (LOM)-based oxygen evolution reaction (OER) under acidic conditions is essential advancing commercialization of electrochemical water-splitting devices. In this study, we effectively constructed a distinctive petal-like nanoflake (NFls) structure by introducing ruthenium (Ru) into NiM (M = Fe, Co) metal–organic framework (MOF) on nickel foam (NFo) substrate through straightforward in situ conversion process layered double hydroxides (LDHs). Utilizing unique properties material, Ru-doped NiFe-BDC/NFo exhibited an impressively low overpotential ∼247 mV at current density 10 mA cm–2 when operating environment OER. Most notably, our champion catalysts displayed exceptional long-term stability during continuous operation 20 h 0.5 M H2SO4, positioning them as some top conditions. The catalytic performance Co)-BDC/NFo can be ascribed to introduction Ru LDH MOF. This transformation significantly enhances kinetics facilitates charge transfer, ultimately resulting attainment optimal activity research introduces novel category OER conditions, which has been relatively underexplored.

Language: Английский

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Non‐Noble‐Metal‐Based Electrocatalysts for Acidic Oxygen Evolution Reaction: Recent Progress, Challenges, and Perspectives

Small, Journal Year: 2024, Volume and Issue: 20(48)

Published: Aug. 25, 2024

Abstract The oxygen evolution reaction (OER) plays a pivotal role in diverse renewable energy storage and conversion technologies, including water electrolysis, electrochemical CO 2 reduction, nitrogen fixation, metal‐air batteries. Among various electrolysis techniques, proton exchange membrane (PEM)‐based devices offer numerous advantages, high current densities, exceptional chemical stability, excellent conductivity, high‐purity H . Nevertheless, the prohibitive cost associated with Ir/Ru‐based OER electrocatalysts poses significant barrier to broad‐scale application of PEM‐based splitting. Consequently, it is crucial advance development non‐noble metal catalysis substance acid‐activity thereby fostering their widespread integration into PEM electrolyzers (PEMWEs). In this review, comprehensive analysis acidic mechanism, encompassing adsorbate mechanism (AEM), lattice (LOM) oxide path (OPM) offered. Subsequently, systematic summary recently reported noble‐metal‐free catalysts transition metal‐based, carbon‐based other types provided. Additionally, compilation situ/operando characterization techniques provided, serving as invaluable tools for furnishing experimental evidence comprehend catalytic mechanism. Finally, present challenges future research directions concerning precious‐metal‐free are comprehensively summarized discussed review.

Language: Английский

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Proton Exchange Membrane Water Splitting: Advances in Electrode Structure and Mass‐Charge Transport Optimization

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

Published: March 4, 2025

Abstract Proton exchange membrane water electrolysis (PEMWE) represents a promising technology for renewable hydrogen production. However, the large‐scale commercialization of PEMWE faces challenges due to need acid oxygen evolution reaction (OER) catalysts with long‐term stability and corrosion‐resistant electrode assemblies (MEA). This review thoroughly examines deactivation mechanisms acidic OER crucial factors affecting assembly instability in complex environments, including catalyst degradation, dynamic behavior at MEA triple‐phase boundary, equipment failures. Targeted solutions are proposed, improvements, optimized designs, operational strategies. Finally, highlights perspectives on strict activity/stability evaluation standards, situ/operando characteristics, practical electrolyzer optimization. These insights emphasize interrelationship between catalysts, MEAs, activity, stability, offering new guidance accelerating systems.

Language: Английский

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Atomic Strain Wave‐Featured LaRuIr Nanocrystals: Achieving Simultaneous Enhancement of Catalytic Activity and Stability toward Acidic Water Splitting

Small, Journal Year: 2024, Volume and Issue: 20(33)

Published: March 26, 2024

Rare earth microalloying nanocrystals have gotten widespread attention due to their unprecedented performances with customization-defected nanostructures, divided energy bands, and ensembled surface chemistry, regarded as a class of ideal electrocatalysts for oxygen evolution reaction (OER). Herein, lanthanide strategy is proposed fabricate strain wave-featured LaRuIr oxide skin through rapid crystal nucleation, using thermally assisted sodium borohydride reduction in aqueous solution at 60 °C. The atomic waves alternating compressive tensile strains, resulting from La-stabilized edge dislocations form Cottrell atmospheres. In 0.5 m H

Language: Английский

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Cauliflower-like Ni3S2 foam for ultrastable oxygen evolution electrocatalysis in alkaline seawater

Nano Research, Journal Year: 2024, Volume and Issue: 17(8), P. 6820 - 6825

Published: May 31, 2024

Language: Английский

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Insights on MOF-derived metal–carbon nanostructures for oxygen evolution

Dalton Transactions, Journal Year: 2024, Volume and Issue: 53(7), P. 2903 - 2916

Published: Jan. 1, 2024

This article focuses on elucidating the fabrication and design of metal-organic framework derived metal-carbon nanostructures for oxygen evolution. It is categorized into three following topics: MOF selection, metal introduction carbon structure.

Language: Английский

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A Review on Highly Efficient Ru-Based Electrocatalysts for Acidic Oxygen Evolution Reaction

Energy & Fuels, Journal Year: 2024, Volume and Issue: 38(13), P. 11521 - 11540

Published: June 18, 2024

Proton exchange membrane water electrolysis (PEMWE) technology is seen as the most compatible hydrogen production with renewable energy generation. However, sluggish kinetics of anodic oxygen evolution reaction (OER) and scarcity acid-resistant, high-activity, low-cost catalysts have seriously hindered overall efficiency manufacturing costs PEMWE. Recently, ruthenium (Ru)-based materials gradually attracted attention due to their suitable binding strength toward intermediates lowest price in noble metal family. Herein, great achievements progress Ru-based acidic OER electrocatalysts are comprehensively reviewed, which started a general description mechanisms situ characterization techniques understand structure–activity relationships. Subsequently, some typical strategies enhance activity stability highlighted. Insights from synthesis methods, advanced characterizations, intermediate evolution, theoretical calculations provided, together our viewpoints on daunting challenges future endeavors for practical employment.

Language: Английский

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