Tailoring the Electronic and Hydrophilic Properties of Nickel Oxide Hydroxides by Bismuth Incorporation Toward Enhanced Alkaline Electrocatalytic Water Oxidation

Small, Год журнала: 2025, Номер unknown

Опубликована: Фев. 10, 2025

Abstract Identification of electrocatalysts with suitable electronic and hydrophilic properties is indispensable for boosting the alkaline oxygen evolution reaction (OER). The incorporation bismuth (Bi) into Nickel oxide hydroxides presented to simultaneously tune these catalyst toward enhanced OER. It shown that Bi doping endows more reversibility Ni, enhances lattice reactivity, leads a weakly binding surface resultant NiBi(OH) x electrocatalyst. These can not only accelerate redox transformation OER intermediates but also enhance oxygen‐involved process, which collaboratively boost kinetics. Moreover, manipulates property electrode, facilitates mass transfer by allowing facile diffusion gaseous products electrolytes. As result, optimized Ni 97 3 (OH) electrode delivers current density 500 mA cm −2 at an overpotential 357 mV without losing performance over 1000 h, on par state‐of‐the‐art NiFe anodes. This work provides effective strategy electrocatalytic in through integration regulation modification.

Язык: Английский

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Size‐adjustable High‐Entropy Alloy Nanoparticles as an Efficient Platform for Electrocatalysis

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Дек. 28, 2024

Abstract The high entropy alloy (HEA) possesses distinctive thermal stability and electronic characteristics, which exhibits substantial potential for diverse applications in electrocatalytic reactions. nanosize of HEA also has a significant impact on its catalytic performance. However, accurately controlling synthesizing small nanomaterials remains challenge, especially the ultrasmall nanoparticles. Herein, we firstly calculate illustrate size structure as well adsorption energies crucial intermediates involved typical processes, such hydrogen evolution reaction (HER), oxygen reduction (ORR), CO 2 electroreduction (CO RR) NO 3 − (NO RR). Under guidance theoretical calculations, synthesize range PtRuPdCoNi nanoparticles with adjustable sizes (1.7, 2.3, 3.0, 3.9 nm) using one‐step spatially confined approach, without any further treatment. Experimentally, smaller HEAs is more favorable HER ORR performances, aligning predictions. Specifically, sized at 1.7 nm (HEA‐1.7) endows 16 mV overpotential current density 10 mA cm −2 , yielding mass activity 31.9 A mg NM −1 noble metal HER, significantly outperforming commercial Pt/C catalyst. This strategy can be easily applicable to other reactions (e.g. ) attributed richness components adjustability, presenting promising platform various advanced catalysts.

Язык: Английский

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Rational design of hollow cubic MnCoFe PBA-P for electrocatalytic oxygen evolution reaction

Materials Today Chemistry, Год журнала: 2025, Номер 44, С. 102530 - 102530

Опубликована: Янв. 18, 2025

Язык: Английский

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Laser‐Induced Co‐Doped FePS₃ with Massively Phosphorus Sulfur Vacancies Nanosheet for Efficient and Highly Stable Electrocatalytic Oxygen Reaction

Advanced Science, Год журнала: 2025, Номер unknown

Опубликована: Апрель 4, 2025

Abstract Purposely optimizing material structure to reduce the energy change of rate‐determining step (RDS) for promoting oxygen evolution reaction (OER) catalytic performance is a major strategy enhance efficiency electrocatalytic water splitting. Density functional theory (DFT) simulations indicate that creating large number defects on or inside 2D FePS 3 very beneficial its OER, especially when there are more defects, structural diversity surface conducive adsorption and intermediates. In particular, Co‐doped surfaces produce S P expose metallic Fe as active sites, performance, stability, significantly enhanced. A facile efficient laser‐ablation‐in‐liquid method then designed combine Co with layered crystal . Amazingly, laser‐induced (Fe 0.53 0.46 )PS sample exhibits excellent OER an overpotential at 288 mV small Tafel slope 58.3 dec −1 Moreover, operates stably 138 h 10 mA cm −2 27 100 , which shows stability far exceeds most catalysts Fe─Co system so far, comprehensive in first echelon transition metal catalyst systems. This work proposes in‐depth understanding mechanism design massive phosphorus sulfur vacancies by manufacturing will shed new light metal‐based without any precious alternatives.

Язык: Английский

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d–p orbitals hybridization triggered electron pumping in Fe–O–Mo bridged structure for efficient water electrolysis

Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 163603 - 163603

Опубликована: Май 1, 2025

Язык: Английский

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Modulating e_g Occupancy by A‐Site Vacancy to Boost Photocatalytic CO₂ Reduction on Perovskite Oxides

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 16, 2025

Abstract For photocatalytic CO 2 reduction, traditional ABO 3 perovskite oxides have suffered from the natural surface covered by passivated AO layer, resulting in low activity. Herein, double Sr TiFeO 6 is used as a precursor and citric acid employed to selectively dissolve A‐site cation, obtaining v ‐Sr with abundant vacancies. Without using any co‐catalysts or sacrificial agents, achieves efficient photoreduction of CH 4 91% selectivity 43.17 µmol g −1 h yield, which almost five times that original . The results indicate removing can increase concentration oxygen vacancies significantly reduce exciton binding energy 0.61 0.32 eV, thereby enhancing charge transfer efficiency. Furthermore, adjust electronic structure, leading decrease e electrons occupancy on active B‐site. This shift reaction intermediates strong adsorption moderate adsorption. Specifically, barrier water oxidation reaction, rate‐determining step for overall greatly reduced. work provides vivid case modulating structure oxide through introducing defects

Язык: Английский

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Optimizing d-p orbital hybridization within V2C-MXene for enhanced sodium ion capture in capacitive deionization

Desalination, Год журнала: 2025, Номер unknown, С. 118601 - 118601

Опубликована: Янв. 1, 2025

Язык: Английский

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Co⁰ and CoO_x Nanoclusters Encapsulated in Carbon Microspheres for the Low‐Temperature Enhanced Reduction of NO_x by CO

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 29, 2025

Abstract Efficient low‐temperature NO reduction by transition metal‐based catalysts remains a significant challenge. In this study, Co‐based catalyst, Co 0 +CoO x @CS, encapsulated carbon microspheres and synthesized via one‐step in situ hydrothermal method, exhibits excellent conversion, exceeding 99% at 150 °C. X‐ray Absorption Fine Structure analysis reveals electronic interactions between C Co, anchoring nanoclusters to the microspheres. The resulting microporous structure enhances reactant accessibility facilitates N─O bond cleavage. Furthermore, 13 O isotopic tracing experiments reveal that follows an ONNO pathway, which adsorbed CO induces dissociation of * ONN , weakly or gaseous promotes further decomposition N 2 . Specifically, species enhance adsorption, while CoO favor with oxygen vacancy‐mediated transfer driving catalytic cycle. This study presents novel approach for preparing offers effective strategy efficient reduction.

Язык: Английский

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Toward Understanding Carboxylate Group Contributions to Mn Oxide Catalysts in the Oxygen-Evolution Reaction

Inorganic Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Фев. 4, 2025

In contrast to the previous assumption that manganese (hydr)oxides, in absence of other metal ions, exhibit high overpotentials for catalyzing oxygen-evolution reaction (OER) under neutral conditions, this study uncovers a more nuanced behavior. We demonstrate layered oxides, when treated with carboxylate groups, OER activity at Mn(III) Mn(IV) oxidation peak following charge accumulation. Upon addition poly(acrylic acid) (PAA), transition occurs lower potential. While current density remains modest, is observed an extraordinarily low overpotential just 20 mV phosphate buffer solution. present detailed mechanistic proposal low-overpotential regime, focusing on and surrounding environment. Oxygen measurements reveal applied potential 1.25 V, turnover frequency (TOF) increases from 2.6 × 10–2 s–1 prior PAA treatment 4.7 post-treatment. However, Tafel slope 384.76 mV/decade before 414.30 after treatment. The reduction attributed complex interaction between process accumulation, mirroring key mechanisms natural systems such as OEC photosystem II (PSII). This interplay likely facilitates system, highlighting relevance these bioinspired processes designing efficient electrocatalysts OER. These findings provide important insights development highly robust water splitting, significant implications future energy conversion storage technologies. By emulating Mn redox PSII, our work paves way design effective catalysts operate minimal loss, advancing sustainable solutions.

Язык: Английский

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Cation (Cr3+, Zn2+, Cu2+ and Mn3+) doping to construct high entropy spinel oxide nanocrystals for modulation of oxygen evolution reaction

Fuel, Год журнала: 2025, Номер 393, С. 134992 - 134992

Опубликована: Март 9, 2025

Язык: Английский

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