Tailoring Built‐In Electric Field in a Self‐Assembled Zeolitic Imidazolate Framework/MXene Nanocomposites for Microwave Absorption

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(19)

Published: Jan. 30, 2024

Abstract Heterointerface engineering, which plays a pivotal role in developing advanced microwave‐absorbing materials, is employed to design zeolitic imidazolate framework (ZIF)–MXene nanocomposites. The ZIF–MXene composites are prepared by electrostatic self‐assembly of negatively charged titanium carbide MXene flakes and positively Co‐containing ZIF nanomaterials. This approach effectively creates abundant Mott–Schottky heterointerfaces exhibiting robust built‐in electric field (BIEF) effect, as evidenced experimental theoretical analyses, leading notable attenuation electromagnetic energy. Systematic manipulation the BIEF‐exhibiting heterointerface, achieved through topological modulation ZIF, proficiently alters charge separation, facilitates electron migration, ultimately enhances polarization relaxation loss, resulting exceptional wave absorption performance (reflection loss RL min = −47.35 dB effective bandwidth f E 6.32 GHz). present study demonstrates an innovative model system for elucidating interfacial mechanisms pioneers novel functional materials with characteristics spatial engineering.

Language: Английский

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Interfacial Hydrogen Spillover on Pd-TiO₂ with Oxygen Vacancies Promotes Formate Electrooxidation

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(9), P. 3945 - 3954

Published: Aug. 28, 2023

Pd-based catalysts are crucial in direct formate fuel cells owing to their high stability and selectivity for the oxidation reaction (FOR) CO2, avoiding carbonaceous poisoning species (e.g., COad, CHx) alkaline media. However, kinetics of electrocatalysts considerably impeded by unfavorable adsorption hydrogen (Had), which serve as primary intermediators occlude active sites. Herein, we crafted electron-rich Pd nanoparticles on a TiO2 support with oxygen vacancies (Pd/Ov-TiO2) improve Had desorption. The as-prepared Pd/Ov-TiO2 exhibited mass activity 4.16 A mgPd–1, outperforming Pd/TiO2 without commercial Pd/C 1.41 2.72 times, respectively. Experimental characterizations density functional theory calculations revealed that oxygen-vacant can concurrently downshift d-band center facilitate spillover, thereby accelerating desorption FOR kinetics. Our findings provide strategy refine broader electrochemical uses.

Language: Английский

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Etched High-Entropy Prussian Blue Analogues as Trifunctional Catalysts for Water, Ethanol, and Urea Electrooxidation

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(28), P. 11271 - 11277

Published: June 29, 2023

The introduction of high-entropy and high specific surface area into Prussian blue analogues (PBAs) has yet to create interest in the field electrocatalytic small-molecule oxidation reactions. Herein, we synthesize a novel class (HE) PBAs with via simple NH3·H2O-etching strategy systematically investigate performance HE-PBA toward water, ethanol, urea Importantly, NH3·H2O-etched (denoted as HE-PBA-e) demonstrated enhanced compared pristine HE-PBA, reaching 10 mA cm-2 potentials 1.56, 1.41, 1.37 V for oxygen evolution reaction (OER), ethanol (EOR), (UOR), respectively. Deep characterizations suggest that NH3·H2O etching treatment not only creates rich nanopores enlarge boosts mass transport electron transfer but also facilitates formation high-valence metal oxides improve intrinsic activity. This demonstration how increasing state metals will serve governing principle rational design more advanced HE-PBAs electrooxidation small molecules.

Language: Английский

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Homogeneous NiMoO4–Co(OH)2 bifunctional heterostructures for electrocatalytic oxygen evolution and urea oxidation reaction

International Journal of Hydrogen Energy, Journal Year: 2023, Volume and Issue: 48(89), P. 34740 - 34749

Published: June 10, 2023

Language: Английский

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Synergistically engineering of vacancy and doping in thiospinel to boost electrocatalytic oxygen evolution in alkaline water and seawater

Journal of Colloid and Interface Science, Journal Year: 2023, Volume and Issue: 650, P. 1500 - 1508

Published: July 19, 2023

Language: Английский

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Concurrent alloying and vacancy engineering for intensifying hydrogen spillover towards alcohol–water co-electrolysis

Journal of Materials Chemistry A, Journal Year: 2023, Volume and Issue: 11(33), P. 17609 - 17615

Published: Jan. 1, 2023

A PdRu–RuO 2 heterostructure with a well-defined PdRu alloy and oxygen-vacancy-enriched RuO is constructed to intensify the hydrogen spillover from Ru .

Language: Английский

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Work Function‐Guided Electrocatalyst Design

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(29)

Published: April 29, 2024

Abstract The development of high‐performance electrocatalysts for energy conversion reactions is crucial advancing global sustainability. design catalysts based on their electronic properties (e.g., work function) has gained significant attention recently. Although numerous reviews electrocatalysis have been provided, no such reports function‐guided electrocatalyst are available. Herein, a comprehensive summary the latest advancements in diverse electrochemical applications provided. This includes function‐based catalytic activity descriptors, and both monolithic heterostructural catalysts. measurement function first discussed descriptors various fully analyzed. Subsequently, function‐regulated material‐electrolyte interfacial electron transfer (IET) employed catalyst design, methods regulating optimizing performance discussed. In addition, key strategies tuning function‐governed material‐material IET examined. Finally, perspectives determination, put forward to guide future research. paves way rational efficient sustainable applications.

Language: Английский

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Engineering defective trimetallic metal–organic framework nanosheets for advanced water oxidation electrocatalysis

Dalton Transactions, Journal Year: 2023, Volume and Issue: 52(24), P. 8466 - 8472

Published: Jan. 1, 2023

Limited by single metal active sites and low electrical conductivity, designing nickel-based metal-organic framework (MOF) materials with high activity durability remains a challenge. Here, novel class of two-dimensional trimetallic MOF nanosheets plentiful sites, rich defects, facilitated mass electron transfer channels is developed as efficient electrocatalysts for boosting oxygen evolution reaction (OER). The unique 2D nanosheet structure enlarges the area; meanwhile, organic ligand in can work pillar to enlarge interplanar space boost ion transportation, synergistic effect between multi-metal effectively promote electrocatalytic activity. Interestingly, after an electrochemical activation process, optimized NiFeZn yield abundant enabling them deliver overpotential 233 mV at 10 mA cm-2 much smaller Tafel slope 37.8 dec-1. More importantly, this method also universal synthesis NiFe-MOF family achieving outstanding OER performance. These findings present strategy construction OER.

Language: Английский

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Ultrafast fabrication of nanospherical CoFe alloys for boosting electrocatalytic water oxidation

International Journal of Hydrogen Energy, Journal Year: 2023, Volume and Issue: 48(87), P. 34009 - 34017

Published: June 4, 2023

Language: Английский

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Interfacial built‐in electric fields facilitating surface reconstruction in heterojunction electrocatalysts for boosting water oxidation and simulated seawater oxidation

Fuel, Journal Year: 2024, Volume and Issue: 369, P. 131716 - 131716

Published: April 17, 2024

Language: Английский

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