Proton-Conducting Hydrogen-Bonded Organic Frameworks

ACS Energy Letters, Journal Year: 2021, Volume and Issue: 6(12), P. 4431 - 4453

Published: Nov. 19, 2021

Solid-state proton-conducting materials play essential roles in various electrochemical devices, including fuel cells as solid electrolytes. Recently, research on hydrogen-bonded organic frameworks (HOFs) has gained considerable momentum diverse applications, several of them show high stability with permanent microporosity. The inherent well-defined H-bonded networks HOFs make versatile platforms solid-state proton conductors exhibiting conductivities 10–1 S cm–1. In this Focus Review, we present the development while briefing early reports systems. Reports conductivity other terminologies, such supramolecular (SOFs), porous salts (POSs), or molecular crystals (PMCs), are also taken into consideration. All efforts have been made to organize and classify a deeper insight design principle critical features realizing conduction properties. advantages, potential challenges, prospects discussed.

Language: Английский

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Short hydrogen-bond network confined on COF surfaces enables ultrahigh proton conductivity

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Nov. 5, 2022

The idea of spatial confinement has gained widespread interest in myriad applications. Especially, the confined short hydrogen-bond (SHB) network could afford an attractive opportunity to enable proton transfer a nearly barrierless manner, but its practical implementation been challenging. Herein, we report SHB on surface ionic covalent organic framework (COF) membranes decorated by densely and uniformly distributed hydrophilic ligands. Combined experimental theoretical evidences have pointed water molecules allocated each ligand, achieving local enrichment hydronium ions concomitant formation SHBs water-hydronium domains. These overlapped domains create interconnected network, which yields unprecedented ultrahigh conductivity 1389 mS cm-1 at 90 °C, 100% relative humidity.

Language: Английский

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Covalent Organic Framework for Rechargeable Batteries: Mechanisms and Properties of Ionic Conduction

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 12(20)

Published: April 10, 2022

Abstract Ionic conduction plays a critical role in the process of electrode reactions and charge transfer kinetics rechargeable battery. Covalent organic frameworks (COFs) have emerged as an exciting new class ionic conductors, made great progress terms their application batteries. The unique features COFs, such well‐defined directional channels, functional diversity, structural robustness, endow COF‐based conductors with low diffusion energy barrier excellent temperature tolerance, which are much superior to classic inorganic or polymer conductors. Here, comprehensive analysis summary ion‐conducting behavior presented, design principles for COFs emphasized. Moreover, systematic overview recent development serving electrodes, separators, solid electrolytes, artificial interphase materials diverse battery applications, metal‐ion batteries, lithium metal lithium–sulfur lithium–CO 2 zinc–air etc., is proposed. This review expected provide theoretical guidance novel kinds conductor bearing intrinsic framework structures boost further research enthusiasm

Language: Английский

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An Immunosensor Using Electroactive COF as Signal Probe for Electrochemical Detection of Carcinoembryonic Antigen

Analytical Chemistry, Journal Year: 2022, Volume and Issue: 94(13), P. 5352 - 5358

Published: March 21, 2022

Two kinds of two-dimensional (2D) covalent-organic frameworks (COF) were used to construct a sandwich-type electrochemical immunosensor for proof-of-concept study. Vinyl-functionalized COFTab-Dva could be linked with Ab1 by the thiol-ene "click" reaction. Electroactive COFTFPB-Thi was modified gold nanoparticles (AuNPs) ensure successful connection Ab2 through Au-S bond. Meanwhile, electroactive as signal probe realize both detection carcinoembryonic antigen (CEA) and amplification signal. In process immunosensor, glassy carbon electrode (GCE) 2D first then connected reaction, next quantitative CEA captured, followed specificially capturing Ab2/AuNPs/COFTFPB-Thi where AuNPs acted nanocarriers served producers. As amount increased, captured also peak intensity redox reaction enhanced accordingly. Thus, realized according COFTFPB-Thi. The owned wide range 0.11 ng/mL-80 ng/mL, low limit 0.034 ng/mL good practicability. This study opens up new revelation using COF probe.

Language: Английский

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Linkage conversions in single-crystalline covalent organic frameworks

Nature Chemistry, Journal Year: 2023, Volume and Issue: 16(1), P. 114 - 121

Published: Sept. 18, 2023

Language: Английский

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Metal–Organic Frameworks for CO₂ Separation from Flue and Biogas Mixtures

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(45)

Published: Aug. 20, 2022

Abstract Great efforts have been made toward the separation of CO 2 from flue gas and biogas to mitigate environmental pollution demand for renewable fuels, respectively. Nonthermal‐based separations, such as adsorption‐based or membrane‐separation technology employing porous materials, are considered be more promising than traditional cryogenic absorption‐based systems. Due several advantages metal–organic frameworks (MOFs) over other conventional reports on by MOFs burgeoning (423 adsorption 56 membrane‐based separations until June 2021) urgent summarization. This review presents a bird's eye view while organizing developed strategies considering performance parameters, trade‐off between sorption capacity selectivity in systems permeability versus In addition, mechanisms involving at molecular level presented. A critical discussion section offers crucial insights into these materials industrial deployment viewpoints. Finally, future recommendations further developments MOF separators thus solving both challenging universal problems global warming energy scarcity simultaneously.

Language: Английский

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Tuning the Interlayer Interactions of 2D Covalent Organic Frameworks Enables an Ultrastable Platform for Anhydrous Proton Transport

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(35)

Published: July 8, 2022

The development of effective, stable anhydrous proton-conductive materials is vital but challenging. Covalent organic frameworks (COFs) are promising platforms for ion and molecule conduction owing to their pre-designable structures tailor-made functionalities. However, poor chemical stability due weak interlayer interactions intrinsic reversibility linkages. Herein, we present a strategy enhancing the two-dimensional COFs via importing planar, rigid triazine units into center C3 -symmetric monomers. developed triazine-core-based COF (denoted as TPT-COF) possesses well-defined crystalline structure, ordered nanochannels, prominent porosity. proton conductivity was ≈10 times those non-triazinyl COFs, even reaching up 1.27×10-2 S cm-1 at 160 °C. Furthermore, TPT-COF exhibited structural ultrastability, making it an effective transport platform with remarkable long-term durability.

Language: Английский

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Current Challenges and Perspectives of Polymer Electrolyte Membranes

Macromolecules, Journal Year: 2022, Volume and Issue: 55(10), P. 3773 - 3787

Published: May 4, 2022

Polymer electrolyte membranes are charged polymers in the membrane shape, which can separate anode reaction from cathode reaction, allowing fabrication of compact and highly efficient electrochemical devices. In recent years, great success has been witnessed development advanced polymer membranes, driven by fast fuel cells that promise a clean sustainable energy supply. However, drawbacks limiting widespread adoption still exist. These include high cost fluorinated poor ion transport capability non-fluorinated aromatic polymer-based (especially under low-humidity conditions), insufficient durability, function-led design for applications beyond cells. Herein we briefly discuss several important challenges should be solved before could extensively adopted real-world applications. how to break through limitation phase-separation strategy on further increasing conductivity, develop proton exchange high-temperature working environments, an alkaline-resistant anion target its hydrogen We also introduce breakthroughs made these aspects during past few years suggest future directions require extra attention.

Language: Английский

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Recent Progress in the Development of MOF-Based Photocatalysts for the Photoreduction of Cr^(VI)

ACS Applied Materials & Interfaces, Journal Year: 2022, Volume and Issue: 14(22), P. 24993 - 25024

Published: May 23, 2022

There has been a direct correlation between the rate of industrial development and spread pollution on Earth, particularly in last century. The organic inorganic pollutants generated from activities have created serious risks to human life environment. concept sustainability emerged tackle environmental issues developing chemical-based industries. However, continued be discharged water resources, finding appropriate techniques for removal remedy wastewater is high demand. Chromium one high-risk heavy metals wastewaters that should removed via physical adsorption and/or transformed into less hazardous chemicals. Photocatalysis as sustainable process received considerable attention it utilizes sunlight irradiation Cr(VI) cost-effective process. Numerous photocatalytic systems developed up now, but metal–organic frameworks (MOFs) gained growing because their unique versatilities facile structural modulations. A variety MOF-based photocatalysts widely employed photoreduction Cr(VI). Here, we review recent progress design MOF summarize performance reactions.

Language: Английский

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Highly Crystalline Polyimide Covalent Organic Framework as Dual-Active-Center Cathode for High-Performance Lithium-Ion Batteries

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(51), P. 23534 - 23542

Published: Dec. 13, 2022

Polyimide covalent organic framework (PI-COF) materials that can realize intrinsic redox reactions by changing the charge state of their electroactive sites are considered as emerging electrode for rechargeable devices. However, highly crystalline PI-COFs with hierarchical porosity less reported due to rapid reaction between monomers and poor reversibility polyimidization reaction. Here, we developed a water-assistant synthetic strategy adjust rate polyimidization, PI-COF (COFTPDA-PMDA) kgm topology consisting dual active centers N,N,N′,N′-tetrakis(4-aminophenyl)-1,4-benzenediamine (TPDA) pyromellitic dianhydride (PMDA) ligands was successfully synthesized high crystallinity porosity. The COFTPDA-PMDA possesses micro-/mesoporous channels largest surface area (2669 m2/g) in PI-COFs, which promote Li+ ions bulky bis(trifluoromethanesulfonyl)imide (TFSI–) electrolyte sufficiently interact on COF skeleton increase specific capacity cathode materials. As material lithium-ion batteries, COFTPDA-PMDA@50%CNT integrated center carbon nanotubes via π–π interactions gave initial 233 mAh/g (0.5 A/g) maintains at 80 even current density 5.0 A/g after 1800 cycles.

Language: Английский

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