Oxygen Vacancy‐Induced Dielectric Polarization Prevails in the Electromagnetic Wave‐Absorbing Mechanism for Mn‐Based MOFs‐Derived Composites

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(34)

Published: June 14, 2022

Abstract Polymeric metal‐organic framework (MOF)‐derived composites are promising functional materials because of their exceptional chemical homogeneity, designable components, and adjustable pore size. The modulation oxygen Mn vacancies via the introduction heteroatoms changes in annealing temperature MOFs‐derived can be a possible solution to investigate polarization loss mechanism, which facilitates improvement electromagnetic capacity. Herein, design laminate‐stacked sphere‐shaped trimetallic CoNiMn‐MOFs is presented. derived CoNi/MnO@C retain original topography MOFs. concentration increases with incorporation heteroatoms, but decreases temperature, prevails mechanism rather than contribution 2+ heterogeneous interfaces. Therefore, minimum reflection sample demonstrates −55.2 dB at 2.6 mm broad effective absorption bandwidth reaches 8.0 GHz 2.1 mm. This work expected provide meaningful insights into significant effect ion vacancy on EM wave‐absorbing performance Mn‐based composites.

Language: Английский

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Rational Design of Transition Metal Phosphide‐Based Electrocatalysts for Hydrogen Evolution

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(7)

Published: Dec. 9, 2022

Abstract Developing efficient and inexpensive electrocatalysts for the hydrogen evolution reaction (HER) is critical to commercial viability of electrochemical clean energy technologies. Transition metal phosphides (TMPs), with merits abundant reserves, unique structure, tunable composition, high electronic conductivity, are recognized as attractive HER catalytic materials. Nevertheless, electrocatalytic activity TMPs still limited by various thorough issues inherent performance bottlenecks. In this review, these carefully sorted, corresponding reasonable explanations solutions elucidated on basis origins TMPs. Subsequently, highly targeted multiscale strategies improve comprehensively presented. Additionally, scientific constructing high‐efficiency TMP‐based proposed. Finally, process, mechanism research, catalyst construction, their application expansion mentioned challenges future directions research field. Expectedly, review offers professional guidelines rational design practical catalysts.

Language: Английский

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A review of modulation strategies for improving catalytic performance of transition metal phosphides for oxygen evolution reaction

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 325, P. 122313 - 122313

Published: Dec. 21, 2022

Language: Английский

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Layered Double Hydroxide-Derived Nanomaterials for Efficient Electrocatalytic Water Splitting: Recent Progress and Future Perspective

ACS Energy Letters, Journal Year: 2022, Volume and Issue: 7(10), P. 3311 - 3328

Published: Sept. 8, 2022

Layered double hydroxides (LDHs) have attracted intense interest in recent research and hold promise a vast range of applications. Because the layered structure diverse compositions, transition-metal-based LDHs are projected to function as active electrocatalysts for oxygen evolution reaction (OER) hydrogen (HER). Delamination LDH hexagonal platelet crystals nanometer level leads enhanced activity. However, several limitations, including collapse poor conductivity LDHs, impede their application electrochemical catalysis. Consequently, LDH-derived nanomaterials being employed high-performance overall water splitting. In this Review, we highlight progress development materials, bimetal oxides hydroxides, bimetallic nitrides/phosphides, sulfides/selenides, MOFs, remarkable Focus is placed on methodologies catalytic efficiency splitting, key problems, future perspectives.

Language: Английский

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Ir Nanoparticles Anchored on Metal‐Organic Frameworks for Efficient Overall Water Splitting under pH‐Universal Conditions

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(17)

Published: March 2, 2023

The construction of high-activity and low-cost electrocatalysts is critical for efficient hydrogen production by water electrolysis. Herein, we developed an advanced electrocatalyst anchoring well-dispersed Ir nanoparticles on nickel metal-organic framework (MOF) Ni-NDC (NDC: 2,6-naphthalenedicarboxylic) nanosheets. Benefiting from the strong synergy between MOF through interfacial Ni-O-Ir bonds, synthesized Ir@Ni-NDC showed exceptional electrocatalytic performance evolution reaction (HER), oxygen (OER) overall splitting in a wide pH range, superior to commercial benchmarks most reported electrocatalysts. Theoretical calculations revealed that charge redistribution bridge induced optimization H2 O, OH* H* adsorption, thus leading accelerated electrochemical kinetics HER OER. This work provides new clue exploit bifunctional pH-universal splitting.

Language: Английский

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F doping and P vacancy engineered FeCoP nanosheets for efficient and stable seawater electrolysis at large current density

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 328, P. 122487 - 122487

Published: Feb. 20, 2023

Language: Английский

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Recent progress on design and applications of transition metal chalcogenide-associated electrocatalysts for the overall water splitting

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Journal Year: 2022, Volume and Issue: 44, P. 7 - 49

Published: Dec. 2, 2022

Language: Английский

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Electronic Modulation of Metal–Organic Frameworks by Interfacial Bridging for Efficient pH‐Universal Hydrogen Evolution

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(1)

Published: Oct. 26, 2022

Abstract Designing well‐defined interfacial chemical bond bridges is an effective strategy to optimize the catalytic activity of metal–organic frameworks (MOFs), but it remains challenging. Herein, a facile in situ growth reported for synthesis tightly connected 2D/2D heterostructures by coupling MXene with CoBDC nanosheets. The multifunctional nanosheets high conductivity and ideal hydrophilicity as bridging carriers can ensure structural stability sufficient exposure active sites. Moreover, Co–O–Ti formed at interface effectively triggers charge transfer modulates electronic structure Co‐active site, which enhances reaction kinetics. As result, optimized CoBDC/MXene exhibits superior hydrogen evolution (HER) low overpotentials 29, 41, 76 mV 10 mA cm −2 alkaline, acidic, neutral electrolytes, respectively, comparable commercial Pt/C. Theoretical calculation demonstrates that bridging‐induced electron redistribution optimizes free energy water dissociation adsorption, resulting improved evolution. This study not only provides novel electrocatalyst efficient HER all pH conditions also opens up new avenue designing highly systems.

Language: Английский

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High‐Entropy Catalyst—A Novel Platform for Electrochemical Water Splitting

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(47)

Published: Sept. 16, 2022

Abstract High‐entropy materials (HEMs) have been in the spotlight as emerging catalysts for electrochemical water splitting. In particular, HEM feature multi‐element active sites and unsaturated coordination well entropy stabilization comparison with their single‐element counterparts. Herein, a comprehensive overview of used splitting is provided, covering both hydrogen evolution reaction (HER) oxygen (OER). Particularly, review begins discussions concept structure HEMs. addition, effective strategies rationally designing HEMs on basis computational techniques experimental aspects described. Importantly, importance computationally aided methods, that is, density functional theory calculations, high‐throughput screening, machine learning, to discovery design HEMs, Furthermore, applications field electrolysis are reviewed. Eventually, an outlook regarding prospects future opportunities provided.

Language: Английский

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Mn-doped nickel–iron phosphide heterointerface nanoflowers for efficient alkaline freshwater/seawater splitting at high current densities

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 454, P. 140061 - 140061

Published: Oct. 31, 2022

Language: Английский

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