Asymmetrically Coordinated Cu–N₁C₂ Single‐Atom Catalyst Immobilized on Ti₃C₂T_x MXene as Separator Coating for Lithium–Sulfur Batteries

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(20)

Published: April 9, 2023

Abstract Lithium–sulfur (Li–S) batteries are receiving great attention owing to their large theoretical energy density, but the shuttle effect and sluggish kinetic conversion of lithium polysulfides (LiPSs) seriously restrict practical applications. Herein, various metal single‐atom catalysts immobilized on nitrogen‐doped Ti 3 C 2 T x ( M SA/N‐Ti , = Cu, Co, Ni, Mn, Zn, In, Sn, Pb, Bi) successfully prepared by a neoteric vacancy‐assisted strategy, applied as polypropylene (PP) separator coatings facilitate fast redox adsorption LiPSs for boosting Li–S batteries. Of particular note, among s, Cu /PP exhibits amazing properties, involving excellent rate performance (925 mAh g −1 at C), superb cycling stability over 1000 cycles, ultra‐high sulfur utilization even loadings (7.19 mg cm −2 ; an areal capacity 5.28 ). X‐ray absorption fine spectroscopy density functional theory calculations reveal that asymmetrically coordinated Cu–N 1 moieties act active sites, which possess higher binding larger electron cloud with than pristine facilitating effectively. This work may provide new insights into single atom‐decorated ultrathin 2D materials enhancing electrochemical advanced storage conversion.

Language: Английский

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Recent Advances and Perspectives on Supported Catalysts for Heterogeneous Hydrogen Production from Ammonia Borane

Advanced Science, Journal Year: 2023, Volume and Issue: 10(21)

Published: April 28, 2023

Ammonia borane (AB), a liquid hydrogen storage material, has attracted increasing attention for utilization because of its high content. However, the slow kinetics AB hydrolysis and indefinite catalytic mechanism remain significant problems large-scale practical application. Thus, development efficient catalysts determination their mechanisms are urgent. A summary preparation process structural characteristics various supported is presented in this paper, including graphite, metal-organic frameworks (MOFs), metal oxides, carbon nitride (CN), molybdenum carbide (MoC), nanotubes (CNTs), boron (h-BN), zeolites, dots (CDs), (MXene). In addition, relationship between electronic structure performance discussed to ascertain actual active sites process. The catalysis systematically discussed, possible paths summarized provide theoretical considerations designing catalysts. Furthermore, three methods stimulating from dehydrogenation by-products design product-regeneration systems summarized. Finally, remaining challenges future research directions effective discussed.

Language: Английский

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Recent Advances in MXene‐Based Aerogels: Fabrication, Performance and Application

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(9)

Published: Dec. 26, 2022

Abstract As one of the “miracle materials” in 21st century, aerogels with ultra‐low weight and remarkable mechanical performance have emerged shown incredible immunity to harsh working environments, attracting substantial research interests across a wide range areas. Recently, exploitation MXene nanosheets into represents new focus field materials science, on account their unique structures outstanding properties. In this review, aim is provide timely insightful overview for recent advances fabrication, performance, application MXene‐based aerogels. The main strategies constructing aerogels, directly from MXene‐dispersion or presence other functional components, are summarized. Furthermore, desirable related applications areas including electromagnetic management, sensors, solar steam generators, energy storage highlighted. A thorough investigation comparison mechanical, electrical, sensing, properties performed understand structure‐property relationships. At last, study concluded summary outlook section future development as well challenges that remained, thus bringing opportunities material engineering

Language: Английский

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Functional MXene‐Based Materials for Next‐Generation Rechargeable Batteries

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(51)

Published: Aug. 9, 2022

Abstract MXenes are seen as an exceptional candidate to reshape the future of energy with their viable surface chemistry, ultrathin 2D structure, and excellent electronic conductivity. The extensive research efforts bring about rapid expansion MXene families enriched functionalities, which significantly boost performance existing energy‐storage devices. In this review, strategies that developed functionalize MXene‐based materials, including tailoring microstructure by ions/molecules/polymers‐initiated interaction or self‐assembly, surface/interface engineering dopants functional groups, constructing heterostructures from various transforming them into a series derivatives inheriting merits precursors highlighted. Their applications in emerging battery technologies demonstrated discussed. With delicate functionalization structural engineering, electrode materials exhibit improved specific capacity rate capability, presence further suppresses even eliminates dendrite formation on metal anodes, lengthens lifespan rechargeable batteries. Meanwhile, serve additives for electrolytes, separators, current collectors. Finally, some directions worth exploration address remaining challenging issues achieve next‐generation high‐power low‐cost batteries proposed.

Language: Английский

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Comprehensive synthesis of Ti3C2Tx from MAX phase to MXene

Nature Protocols, Journal Year: 2024, Volume and Issue: 19(6), P. 1807 - 1834

Published: March 19, 2024

Language: Английский

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