Imidazole encapsulated in core–shell MOF@COFs with a high anhydrous proton conductivity

Liu, Shucheng; Han, Li; Shuai, Yu; Ding, Zhao; Liu, Yi

doi:10.1039/d2ma00580h

Cited by 5 publications

(4 citation statements)

References 38 publications

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“…Therefore, Liu et al developed a surface modification strategy to inhibit decomposition by decoration of a COF on the surface of a MOF. 99 The thickness of a COF shell is about 50 nm (Figure 4). Imidazole molecules, as proton carriers, were confined into the channels of UiO-67@ TAPB-DMTP-COF with loading content of 63.6%.…”

Section: ■ Pore Impregnationmentioning

confidence: 99%

“…Generally, MOF proton conductors faced the issue of chemical stability. Therefore, Liu et al developed a surface modification strategy to inhibit decomposition by decoration of a COF on the surface of a MOF . The thickness of a COF shell is about 50 nm (Figure ).…”

Section: Pore Impregnationmentioning

confidence: 99%

Section: Pore Impregnationmentioning

confidence: 99%

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Recent Progress of Crystalline Porous Frameworks for Intermediate-Temperature Proton Conduction

et al. 2023

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Proton exchange membranes (PEMs), especially for work under intermediate temperatures (100–200 °C), have attracted great interest because of the high CO toleration and facial water management of the corresponding proton exchange membrane fuel cells (PEMFCs). Traditional polymer PEMs faced challenges of low stability and proton carrier leaking. Crystalline porous materials, such as metal–organic frameworks (MOFs) and covalent organic frameworks (COFs), are promising to overcome these issues contributed by nanometer-sized channels. Herein we summarized the recent development of MOF/COF-based intermediate-temperature proton conductors. The strategies of framework engineering and pore impregnation were introduced in detail for raising proton conductivity. The proton-conducting mechanism was described as well. This spotlight will provide new insight into the fabrication of MOF/COF proton conductors under intermediate-temperature and anhydrous conditions.

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Section: ■ Pore Impregnationmentioning

confidence: 99%

Section: Pore Impregnationmentioning

confidence: 99%

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Recent Progress of Crystalline Porous Frameworks for Intermediate-Temperature Proton Conduction

et al. 2023

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“…In recent years, there has been increasing interest in imidazole-based proton conductors. High-proton conductivity in imidazole or composite proton conductors based on imidazole has been reported. ,, Numerous studies have also been conducted on inorganic or organic-oriented framework-type proton conductors encapsulating imidazole as proton conduction species. – In addition, it was discovered that the silanol groups on the surface of SiO 2 could interact with imidazole through acid–base reactions, enhancing proton conductivity in the acid–base interaction region. – In this case, silanol group can act as a acid group due to the small p K a of around 4.4–4.5 . Our group has previously reported on the efficiency of SiO 2 -containing matrixes as proton conductors. – In this study, we developed novel proton conductors composed of both sides of imidazole sandwiched between HCl and SiO 2 as two types of materials through acid–base reactions using a mechanochemical milling technique (Figure a).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structure-Electrochemical Property Relationships of Hybrid Imidazole-Based Proton Conductors for Medium-Temperature Anhydrous Fuel Cells

Maegawa,

Wlazło,

Huy Phuc

et al. 2023

Chem. Mater.

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Medium-temperature anhydrous operation (above 120 °C) of polymer electrolyte membrane fuel cells (PEMFCs) has been extensively investigated, particularly for heavy-duty fuel cell applications. In this context, inorganic–organic composites based on acid–base reactions emerge as essential candidates for medium-temperature PEMFC applications. This study aims to develop a proton-conductive salt by simultaneously coordinating multiple acid species with heterocyclic imidazole (Imi), which possesses basic sites capable of reacting with acids. The goal is to create a highly proton-conductive composite suitable for anhydrous conditions. The mechanochemical milling method was employed to incorporate SiO2 as a second material into imidazole hydrochloride (ImiHCl). As a result, the addition of SiO2 to ImiHCl led to an enhancement in proton conductivity compared with imidazole (Im), imidazole hydrochloride (ImiHCl), and imidazole–SiO2 (Imi–SiO2). Furthermore, a method based on density functional theory (DFT) was proposed to predict the high/low proton conductivity, which exhibited good correlation with the experimentally obtained conductivity values. This DFT approach provided insights into the proton conduction mechanism. Through comprehensive physical characterizations (FT-IR, NMR, XRD, and TGA) and DFT calculations, it was revealed that the high proton conductivity observed in the corresponding xImiHCl-(100 – x)SiO2 composites (composition ratio of ImiHCl: x = 40–100) can be attributed to an increased number of proton species, accelerated proton dissociation facilitated by SiO2, and promotion of proton diffusion. Particularly, the xImiHCl-(100 – x)SiO2 (x = 60) electrolyte demonstrated the highest proton conductivity of 1.4 × 10–2 S cm–1. Subsequently, a PBI-based electrolyte membrane prepared using 60ImiHCl-40SiO2 significantly enhanced the fuel cell performance to 521 mW cm–2 under anhydrous conditions at 150 °C.

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COF and MOF Hybrids: Advanced Materials for Wastewater Treatment

Ahmadijokani,

Ghaffarkhah,

Molavi

et al. 2023

Adv Funct Materials

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Recent advances in ordered porous materials, including metal‐organic (MOF) and covalent organic frameworks (COF), are set to revolutionize the strategies used for wastewater treatment. This is attributed to the large surface area, high crystallinity, structural tunability, thermal and chemical stability, and well‐defined structures of MOF and COF. Despite the distinctive properties exhibited by the single system (either MOF or COF), the combination of COF and MOF, as a hybrid construct, offers a remarkable opportunity to achieve superior functionality and performance. The favorable features of COF–MOF hybrids in different wastewater treatment sectors have opened new venues for effective environmental remediation. This review presents the state‐of‐the‐art design, synthesis, and application of COF–MOF hybrids. The synthesis principles, including MOF‐first, COF‐first, and post‐synthetic linkage of pre‐synthesized COFs and MOFs are summarized. The potential of these novel materials is evaluated by considering contaminant sensing, adsorptive removal, and catalytic photodegradation.The conclusion is drawn by assessing the existing hurdles and potential opportunities in the development of COF‐MOF hybrids as an innovative yet viable approach for addressing wastewater treatment.

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Imidazole encapsulated in core–shell MOF@COFs with a high anhydrous proton conductivity

Abstract: Proton-conductive materials are the most important components in fuel cells. At present, there are still significant challenges for the controllable design of anhydrous proton electrolytes with high conductivity at high...

Cited by 5 publications

References 38 publications

Recent Progress of Crystalline Porous Frameworks for Intermediate-Temperature Proton Conduction

Recent Progress of Crystalline Porous Frameworks for Intermediate-Temperature Proton Conduction

Synthesis and Structure-Electrochemical Property Relationships of Hybrid Imidazole-Based Proton Conductors for Medium-Temperature Anhydrous Fuel Cells

COF and MOF Hybrids: Advanced Materials for Wastewater Treatment

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