Design and Synthesis of Self-Supported Water-Splitting Transition Metal-Based Electrocatalysts via Electrospinning

Catalysts, Journal Year: 2025, Volume and Issue: 15(3), P. 205 - 205

Published: Feb. 21, 2025

Recent advances in transition metal-based electrocatalysts have significantly enhanced the hydrogen evolution reaction (HER) and oxygen (OER) water electrocatalysis. Self-supported electrodes, where active sites are directly integrated with substrates, offer superior kinetics stability compared to traditional powder-based electrocatalysts. The electrospinning technique is particularly effective for fabricating self-supported high surface areas, porosity, uniform distribution of sites, leading improved catalytic performance. Despite extensive research on electrocatalysts, a comprehensive review focusing those developed via remains scarce. This provides detailed overview process, fundamental principles electrocatalysis, recent progress development fabricated through this approach.

Language: Английский

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Porous Antimony Tin Oxide with a Particle Assembly Structure as an IrO₂ Support for an Efficient Oxygen Evolution Reaction in Proton-Exchange Membrane Water Electrolysis

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

Published: April 1, 2025

Proton-exchange membrane water electrolysis (PEMWE) holds great promise for hydrogen production applications. However, the reliance of PEMWE electrodes on high loadings expensive iridium poses a significant barrier to their commercial viability. Therefore, development high-performance oxygen evolution catalysts with low content is critical importance. In this research, porous antimony tin oxide (ATO) conductive support particle assembly aggregate structure was fabricated by carbon template removal method. ATO-supported IrO2 exhibits significantly improved reaction (OER) activity, much lower overpotential compared unsupported catalyst. Moreover, it achieves 1.8 V at 2 A cm-2 an ultralow loading (0.3 mgIr cm-2) proton-exchange electrolyzer. Characterization techniques and density functional theory calculations have elucidated that enhanced performance attributed morphology ATO strong metal oxide-support interaction between support. These findings validate practicality nanostructured antimony-tin-oxide-supported applications offer pathway design low-Ir OER catalysts.

Language: Английский

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Enhancing Acidic Water Electrolysis via Local Electronic Regulation of Ru/TiO_x Catalyst with Oxygen Coordination Unsaturated Ti Sites

ACS Catalysis, Journal Year: 2024, Volume and Issue: 15(2), P. 768 - 779

Published: Dec. 25, 2024

Effective local electron regulation in ruthenium-based catalysts acidic oxygen evolution reactions (OER) remains a key challenge. The lack of unified understanding catalyst activity and stability based on limits the further development proton exchange membrane water electrolysis (PEMWE). In this study, we develop concept coordination unsaturated Ti (TiOCU) sites. Based constructed dual-oxide heterojunction interface Ru/TiOx catalyst, achieve precise modulation d-electron orbitals Ru charge redistribution between Ru–Obridge–TiOCU units strengthened Ru–O bonds suppresses formation high-valence species deactivation catalyst. Combined with density functional theory (DFT) calculations situ spectroscopic experiments, confirm that dz2 orbital significantly optimizes deprotonation process interfacial hydroxyl-rich interface, thereby enhancing OER kinetics dominance adsorbed mechanism (AEM). Consequently, exhibits superior performance, achieving current 10 mA/cm2 at an overpotential only 237 mV 0.5 M H2SO4, demonstrates for over 160 h. This work reveals application TiOCU, providing perspective transition metal defect materials electrolysis.

Language: Английский

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Spinel-type high-entropy oxides for enhanced oxygen evolution reaction activity in anion exchange membrane water electrolyzers

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160641 - 160641

Published: Feb. 1, 2025

Language: Английский

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Tailoring oxygen vacancies of W-doped TiO2 to stabilize Ir for boosting oxygen evolution activity in proton-exchange membrane water electrolysis

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160933 - 160933

Published: Feb. 1, 2025

Language: Английский

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Positively Charged P-Assisted Ru–Zn Dual Active Sites Promote Oxygen Radical Coupling Mechanism for Acidic Water Oxidation

ACS Sustainable Chemistry & Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: March 6, 2025

Language: Английский

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Ir/Mn Co‐Mixing and Oxide‐Support Interaction Modulation Through Plasma Promoted Asymmetric Oxygen Coupling for Stable Acidic Oxygen Evolution

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

Published: March 23, 2025

Abstract Developing efficient and stable catalysts that facilitate the oxygen‐evolution reaction (OER) through an oxide‐path mechanism (OPM) is of considerable interest. However, it remains a significant challenge due to stringent structural requirements these catalysts. This work reports using strategy integrates Ir/Mn co‐mixing strong oxide‐support interaction (SOSI) modulation, Ir‐based follow OPM for acidic OER can be developed. The mainly relies on optimizing distance oxygeneous intermediate adsorption sites by modulating SOSI plasma defect engineering trigger pathway with lower energy barrier. density‐functional‐theory (DFT) calculations reveal electronic coupling between Ir Mn via Ir─O─Mn bond ready adsorbed site those site, leading asymmetric oxygen OER. developed catalyst merely requires overpotential 240 mV drive 10 mA cm −2 mass‐activity > 75 times higher than IrO 2 . When used in proton‐exchange‐membrane water‐electrolyzers, shows high performance excellent stability at industrial‐level current density 1.0 A

Language: Английский

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Compressive strain in high-entropy alloy for high-performance acidic oxygen evolution

Matter, Journal Year: 2025, Volume and Issue: unknown, P. 102091 - 102091

Published: March 1, 2025

Language: Английский

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Low‐Ir‐Content Ir_0.10Mn_0.90O₂ Solid Solution for Highly Active Oxygen Evolution in Acid Media

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

Published: April 3, 2025

Iridium (Ir)-based materials are the most widely used oxygen evolution reaction (OER) electrocatalysts in proton exchange membrane water electrolysis (PEMWE). However, their commercial application suffers from high cost and insufficient activity. To optimize atom utilization efficiency of Ir, aim is to engineer develop a rutile-structured solid solution catalyst with minimal Ir content, which identified through phase boundary. Here, Ir0.10Mn0.90O2 represents lowest content desired IrO2-MnO2 solution. The exhibits outstanding OER performance acidic electrolytes, reaching remarkable mass activity 1135 A g-1 at an overpotential 300 mV, ≈50 times higher than that IrO2 catalyst. Additionally, it demonstrates excellent stability current density 200 mA cm-2 over 120 h during PEMWE operations. Density functional theory (DFT) calculations indicate hydroxylation process can be efficiently promoted by electron-withdrawing on sites Ir0.10Mn0.90O2, contributing enhancement

Language: Английский

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External electric field effects on H2S thermocatalysis for highly efficient H2 production

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 162779 - 162779

Published: April 1, 2025

Language: Английский

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