FeNi alloys incorporated N-doped carbon nanotubes as efficient bifunctional electrocatalyst with phase-dependent activity for oxygen and hydrogen evolution reactions

Journal of Material Science and Technology, Год журнала: 2024, Номер 201, С. 157 - 165

Опубликована: Апрель 21, 2024

Язык: Английский

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Metal‐Organic Framework‐Based Electrocatalysts for Acidic Water Splitting

Advanced Functional Materials, Год журнала: 2024, Номер 34(34)

Опубликована: Март 13, 2024

Abstract The proton exchange membrane water electrolysis system has long been considered a promising technique for the generation of hydrogen owing to its high electrolytic efficiency, reliability, and quick response renewable energy sources. At present, noble metals their oxides (e.g., Pt, IrO 2 , RuO ) are widely used as active electrocatalysts accelerating conversion efficiency process, especially in acidic media. Nevertheless, scarcity instability seriously impede large‐scale application practice. In past years, metal‐organic frameworks (MOFs) have proven be an ideal platform designing efficient cost‐effective electrodes due unique physicochemical properties. this review, fundamental catalytic mechanisms evolution reaction (HER) oxygen (OER) media discussed first. Then, design strategies advanced characterizations MOF‐based water‐splitting catalysts summarized. Finally, recent research advances HER OER electrolytes, along with current challenges future opportunities, provided.

Язык: Английский

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Partial Exsolution Enables Superior Bifunctionality of Ir@SrIrO₃ for Acidic Overall Water Splitting

Advanced Science, Год журнала: 2024, Номер 11(24)

Опубликована: Апрель 2, 2024

Abstract The pursuit of efficient and durable bifunctional electrocatalysts for overall water splitting in acidic media is highly desirable, albeit challenging. SrIrO 3 based perovskites are electrochemically active oxygen evolution reaction (OER), however, their inert activities toward hydrogen (HER) severely restrict the practical implementation splitting. Herein, an Ir@SrIrO heterojunction newly developed by a partial exsolution approach, ensuring strong metal‐support interaction OER HER. Notably, ‐175 electrocatalyst, prepared annealing 5% H 2 atmosphere at 175 °C, delivers ultralow overpotentials 229 mV 10 mA cm −2 28 HER, surpassing most recently reported electrocatalysts. Moreover, electrolyzer using electrocatalyst demonstrates potential application prospect with high electrochemical performance excellent durability environment. Theoretical calculations unveil that constructing regulates interfacial electronic redistribution, ultimately enabling low energy barriers both

Язык: Английский

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Synthesis of Conductive MOFs and Their Electrochemical Application

Small, Год журнала: 2023, Номер 20(17)

Опубликована: Дек. 7, 2023

Abstract Conductive metal–organic frameworks (MOFs) are a type of porous material. It consists metal ions coordinated with highly conjugated organic ligands. The high density carriers and orbital overlap contribute to the amazing conductivity. Additionally, conductive MOFs inherit advantages large specific surface area, structural diversity, adjustable pore size from MOFs. These excellent properties have attracted many researchers explore controllable synthesis electrochemical applications over past decade. This work provides an overview recent advances in strategies highlights their electrocatalysis, supercapacitors, sensors, batteries. Finally, challenges faced by application discussed, as well views on promising solutions for them presented.

Язык: Английский

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Unravelling the fundamental insights underlying “confinement effects” in enhanced electrocatalysis

Nano Energy, Год журнала: 2024, Номер 125, С. 109529 - 109529

Опубликована: Март 20, 2024

Язык: Английский

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Modulating Carrier Oxygen Vacancies to Enhance Strong Oxide‐Support Interaction in IrO₂/Nb₂O_5‐x Catalysts for Promoting Acidic Oxygen Evolution Reaction

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Сен. 2, 2024

Abstract Given the pronounced dissolution of electrocatalysts in acidic environments, quest for effective oxygen evolution reaction (OER) suitable proton exchange membrane (PEM) water electrolyzers persists as a formidable challenge. In this investigation, catalysts are synthesized by creating vacancies within various metal oxides (Nb 2 O 5‐x , Ta ZrO 2‐x TiO ) through plasma‐assisted method, thereby facilitating immobilization IrO onto these defect‐rich surfaces. The findings unveil that /Nb manifests reduced overpotentials during OER, achieving an overpotential down to 225 mV@10 mA cm −2 coupled with outstanding durability at multicurrent densities exceeding 200 h, attributed strong oxide‐support interaction (SOSI) between catalyst and Nb substrate. Density functional theory (DFT) computations uncover intensified binding affinities thus modulating central energy levels Ir's d orbitals toward favorable OER conditions, consequently bolstering electrocatalytic activity stability composite catalyst. Furthermore, employing PEM electrolyzer anode enables consistent operation 1000 Ir content only 0.2852 mg consumption 4.34 kWh Nm −3 H . This achievement substantially lowers cost hydrogen production US$ 0.96 per kilogram, underscoring its potential practical applications.

Язык: Английский

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High quality bifunctional cathode for rechargeable zinc-air batteries using N-doped carbon nanotubes constrained CoFe alloy

Journal of Colloid and Interface Science, Год журнала: 2024, Номер 661, С. 681 - 689

Опубликована: Фев. 1, 2024

Язык: Английский

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Disentangling Competitive and Synergistic Chemical Reactivities During the Seeded Growth of High-Entropy Alloys on High-Entropy Metal Sulfide Nanoparticles

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(28), С. 19521 - 19536

Опубликована: Июль 6, 2024

The seeded growth of one type nanoparticle on the surface another is foundational to synthesizing many multifunctional nanostructures. High-entropy nanoparticles that randomly incorporate five or more elements offer enhanced properties due synergistic interactions. Incorporating high-entropy into platforms essential for merging their unique with functional enhancements arise from particle-particle However, complex compositions materials complicate process competing particle and chemical reactivity pathways. Here, we design synthesize a 36-member library identify disentangle these competitive interactions, ultimately defining characteristics underpin alloys metal sulfide nanoparticles. As model system, focus (Cu,Zn,Co,In,Ga)S-SnPdPtRhIr, which combines semiconductor alloy catalyst. We study all possible pairwise combinations Sn, Pd, Pt, Rh, Ir, SnPdPtRhIr sulfides Cu

Язык: Английский

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MOF-derived CuCo carbon microspheres assembled with nitrogen-doped carbon nanotubes as PMS activator for the efficient degradation of p-nitrophenol

Separation and Purification Technology, Год журнала: 2024, Номер 354, С. 129107 - 129107

Опубликована: Авг. 6, 2024

Язык: Английский

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Tackling activity-stability paradox of reconstructed NiIrOx electrocatalysts by bridged W-O moiety

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Дек. 4, 2024

One challenge remaining in the development of Ir-based electrocatalyst is activity-stability paradox during acidic oxygen evolution reaction (OER), especially for surface reconstructed IrOx catalyst with high efficiency. To address this, a phase selective constructed by forming bridged W-O moiety NiIrOx electrocatalyst. Through an electrochemical dealloying process, nano-porous structure surface-hydroxylated rutile NiWIrOx engineered via Ni as sacrificial element. Despite low Ir content, demonstrates minimal overpotential 180 mV OER at 10 mA·cm−2. It maintains stable 300 mA·cm−2 current density approximately h 1.8 VRHE and shows stability number 3.9 × 105 noxygen · nIr−1. The resulting W – O–Ir bridging motif proves pivotal enhancing efficacy catalysis facilitating deprotonation intermediates promoting thermodynamically favorable dual-site adsorbent mechanism. Besides, insertion enabling charge balance through W-O-Ir motif, effectively counteracting lattice loss regulating Ir-O co-valency. electrocatalysts water electrolysis paradox. Here, authors report facile approach to tackle introducing electrocatalyst, simultaneously.

Язык: Английский

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