Amorphous MnO₂ Lamellae Encapsulated Covalent Triazine Polymer‐Derived Multi‐Heteroatoms‐Doped Carbon for ORR/OER Bifunctional Electrocatalysis

Advanced Materials, Год журнала: 2024, Номер 36(18)

Опубликована: Янв. 19, 2024

Abstract The intelligent construction of non‐noble metal materials that exhibit reversible oxygen reduction reaction (ORR) and evolution (OER) with bifunctional electrocatalytic performance is greatly coveted in the realm zinc‐air batteries (ZABs). Herein, a crafted structure‐amorphous MnO 2 lamellae encapsulated covalent triazine polymer‐derived N, S, P co‐doped carbon sphere (A‐MnO /NSPC) designed using self‐doped pyrolysis coupled an situ encapsulation strategy. customized A‐MnO /NSPC‐2 demonstrates superior performance, confirmed by small Δ E index 0.64 V for ORR/OER. Experimental investigations, along density functional theory calculations validate predesigned amorphous surface defects abundant heteroatom catalytic active sites collectively enhance performance. Impressively, /NSPC‐based rechargeable liquid ZABs show large open‐circuit potential 1.54 V, ultrahigh peak power 181 mW cm −2 , enormous capacity 816 mAh g −1 remarkable stability more than 1720 discharging/charging cycles. Additionally, assembled flexible all‐solid‐state also demonstrate outstanding cycle stability, surpassing 140 Therefore, this highly operable synthetic strategy offers substantial understanding development magnificent electrocatalysts various sustainable energy conversions beyond.

Язык: Английский

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Recent Development on Transition Metal Oxides‐Based Core–Shell Structures for Boosted Energy Density Supercapacitors

Small, Год журнала: 2024, Номер 20(31)

Опубликована: Апрель 9, 2024

Abstract In recent years, nanomaterials exploration and synthesis have played a crucial role in advancing energy storage research, particularly supercapacitor development. Researchers diversified materials, including metal oxides, chalcogenides, composites, as well carbon to enhance power density. Balancing density with electrochemical stability remains challenging, driving intensified efforts electrode materials. This review focuses on progress designing synthesizing core–shell materials tailored for supercapacitors. The architecture offers advantages such increased surface area, redox active sites, electrical conductivity, ion diffusion kinetics, specific capacitance, cyclability. explores the impact of core shell specifically transition oxides (TMOs), behavior. Metal oxide choices, cobalt preferred manganese shell, are discussed. also highlights characterization techniques assessing structural, morphological, properties Overall, it provides comprehensive overview ongoing TMOs‐based material research supercapacitors, showcasing their potential applications ranging from gadgets electric vehicles. outlines existing challenges future opportunities evolving advancements, holding promise high‐efficiency devices.

Язык: Английский

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Recent Advances in MXenes Based Composites as Photocatalysts: Synthesis, Properties and Photocatalytic Removal of Organic Contaminants from Wastewater

ChemCatChem, Год журнала: 2023, Номер 15(18)

Опубликована: Июль 6, 2023

Abstract MXene has indeed gained significant attention in recent years as a promising photocatalyst for various applications, including photocatalytic degradation of pollutants. possesses several unique physical and chemical properties that make it suitable such its uniform planar structure, strong metal conductivity, effective functional groups, numerous derivatives. These contribute to the excellent photodegradation performance long‐term stability exhibited by MXene‐based photocatalysts compared other photocatalysts. composites, which are formed incorporating with materials, demonstrate even better activity due their abundant active sites porous structure. One crucial factor influencing is presence groups on surface MXene. play role process overall efficiency catalyst. To provide broader understanding photocatalysts, physicochemical briefly described this review. This includes structural characteristics, electrical groups. review also investigates synthesis routes preparing MXene, both natural state composites materials. methods essential tailoring meet specific requirements. Finally, discusses future work challenges photocatalysis. field holds great promise addressing environmental concerns improving organic compounds. However, further research needed optimize methods, enhance efficiency, explore practical applications

Язык: Английский

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Growth of BiOBrxI1-x solid-solutions with tunable band-gaps on carbon fiber cloth as flexible membrane-shaped photocatalyst for purifying antibiotic wastewater

Journal of Cleaner Production, Год журнала: 2023, Номер 414, С. 137725 - 137725

Опубликована: Июнь 7, 2023

Язык: Английский

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Precisely Engineering Asymmetric Atomic CoN₄ by Electron Donating and Extracting for Oxygen Reduction Reaction

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(21)

Опубликована: Март 8, 2024

Abstract The development of nonpyrolytic catalysts featuring precisely defined active sites represents an effective strategy for investigating the fundamental relationship between catalytic activity oxygen reduction reaction (ORR) and their local coordination environments. In this study, we have synthesized a series model electrocatalysts with well‐defined CoN 4 centers nonplanar symmetric structures. These were prepared by sequential process involving chelation cobalt salts 1,10‐phenanthroline‐based ligands various substituent groups (phen(X), where X=OH, CH 3 , H, Br, Cl) onto covalent triazine frameworks (CTFs). By modulating electron‐donating or electron‐withdrawing properties on phen‐based ligands, electron density surrounding was effectively controlled. Our results demonstrated direct correlation ability group phenanthroline ligands. Notably, catalyst denoted as BCTF−Co‐phen(OH), OH group, exhibited highest ORR activity. This custom‐crafted achieved remarkable half‐wave potential up to 0.80 V vs. RHE impressive turnover frequency (TOF) value 47.4×10 −3 Hz at in alkaline environment.

Язык: Английский

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Halogen modified organic porous semiconductors in photocatalysis: mechanism, synthesis, and application

Advanced Powder Materials, Год журнала: 2024, Номер 3(2), С. 100178 - 100178

Опубликована: Янв. 23, 2024

Photocatalysis is considered as the promising energy conversion way to resolve issues of crisis and environmental pollution. As key point photocatalysis, photocatalyst determines final efficiency from solar, therefore, composition photoelectronic nature which deserve be valued. Halogen often affects immensely intrinsic electron configuration matrix because electrophilic property, thus its topic has attracted lots attention for photocatalytic application. In this review, halogen-contained organic porous semiconductors are discussed in detailed. Firstly, role halogens photocatalysis based on categorized. Then, introduce into their applications reviewed. At last, outlooks given at end paper. This review would bring new insights non-metal doping engineering improving performance semiconductors.

Язык: Английский

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Rapid Thermochromic and Highly Thermally Conductive Nanocomposite Based on Silicone Rubber for Temperature Visualization Thermal Management in Electronic Devices

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(6), С. 7883 - 7893

Опубликована: Фев. 1, 2024

Effective heat dissipation and real-time temperature monitoring are crucial for ensuring the long-term stable operation of modern, high-performance electronic products. This study proposes a silicon rubber polydimethylsiloxane (PDMS)-based nanocomposite with rapid thermal response high conductivity. enables both The reported material primarily consists thermally conductive layer (Al2O3/PDMS composites) reversible thermochromic (organic material, graphene oxide, PDMS nanocoating; OTM-GO/PDMS). conductivity OTM-GO/Al2O3/PDMS nanocomposites reached 4.14 W m–1 K–1, reflecting an increase 2200% relative to that pure PDMS. When operating 35, 45, 65 °C, surface turned green, yellow, red, respectively, time was only 30 s. also exhibited outstanding repeatability maintained excellent color stability over 20 repeated applications.

Язык: Английский

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Safe, Facile, and Straightforward Fabrication of Poly(N‐vinyl imidazole)/Polyacrylonitrile Nanofiber Modified Separator as Efficient Polysulfide Barrier Toward Durable Lithium–Sulfur Batteries

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Сен. 9, 2024

Abstract Lithium–sulfur (Li–S) batteries are gaining tremendous attention as promising energy storage solutions due to their impressive density and the affordability of sulfur. However, practical use Li–S encounter major obstacles such polysulfide shuttle effect, which leads capacity loss decreased cycling stability. Herein, a polyethylene imidazole/polyacrylonitrile (PVIMPAN) nanofibers‐modified Celgard separator is constructed via facile electrospinning strategy used polysulfides barrier for batteries. The electron‐deficient imidazole groups introduced on surface PVIMPAN separators create that prevents shuttling extends cycle life. Additionally, developed exhibits significantly enhanced Li + transfer number 0.60, compared commercial (0.20). This enhancement can be attributed strong binding between bis(trifluoromethanesulphonyl)imide anion, leading improved plating stripping performance. Consequently, incorporating into enable achievement discharge 786.0 mAh g −1 with close 100% Coulombic efficiency after 500 cycles at 1C (25 °C). It believed this work provide valuable insights designing suitable robust metal–sulfur

Язык: Английский

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Crown-ether threaded covalent organic polyrotaxane framework (COPF) towards synergistic crown/Zn2+/photothermal/photodynamic antibacterial and infected wound healing therapy

Biomaterials Advances, Год журнала: 2024, Номер 159, С. 213814 - 213814

Опубликована: Фев. 26, 2024

Язык: Английский

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Crystalline Covalent Triazine Frameworks and 2D Triazine Polymers: Synthesis and Applications

Accounts of Chemical Research, Год журнала: 2025, Номер unknown

Опубликована: Янв. 24, 2025

ConspectusCovalent triazine frameworks (CTFs) are a novel class of nitrogen-rich conjugated porous organic materials constructed by robust and functional linkages, which possess unique structures excellent physicochemical properties. They have demonstrated broad application prospects in gas/molecular adsorption separation, catalysis, energy conversion storage, etc. In particular, crystalline CTFs with well-defined periodic molecular network regular pore channels can maximize the utilization features promote deep understanding structure-property relationship. However, due to poor reversibility basic reaction for constructing unit traditional harsh synthesis conditions, it remains considerable challenge synthesize diverse structures, there is still significant lack their polymerization mechanism, limits precise structural design, large-scale preparation, practical applications. As building block bulk CTFs, two-dimensional polymers (2D-TPs) ideally single-atom thickness also aroused intensive interest ultrathin 2D sheet morphology flexibility, fully exposed plane active sites, dispersibility processability. efficient scalable production high-quality 2D-TPs investigation properties functions remain largely unexplored.In this Account, we summarize our recent contributions exploration 2D-TPs. We first introduce synthesis, mechanism CTFs. order successively used series new synthetic methods including solution strategy, microwave-assisted superacid-catalyzed polyphosphoric acid-catalyzed solvent-free FeCl3-catalyzed achieving highly layered from gram level hundred-gram then kilogram realizing CTF structures. reveal direct ordered that provided meaningful guidance controllable preparation Next, formation developed effective bottom-up top-down strategies prepare different needs. On one hand, established dynamic interface method, monomer-dependent salt-catalyzed strategy down single-layer limit important insights into mechanism. other opened up physical chemical exfoliation such as liquid sonication ball milling covalent noncovalent modification Then, present progress various batteries, photo/electrocatalysis, adsorbents an emphasis on outstanding performance Lastly, main challenges faced applications future research directions discussed detail. hope Account will provide valuable promoting development framework polymer materials.

Язык: Английский

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