Towards basic ionic liquid-based hybrid membranes as hydroxide-conducting electrolytes under low humidity conditions

Liu, Cong; Feng, Sinan; Zhuang, Zhuang; Qi, Duo; Li, Guibin; Zhao, Chengji; Li, Xuefeng; Na, Hui

doi:10.1039/c5cc03462k

Cited by 24 publications

(20 citation statements)

References 26 publications

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“…The same research group also fabricated similar composite membranes (IL@ZIF‐8/PVA/IL) using a different membrane preparation process. [ 54 ] In this work, IL@ZIF‐8 nanocrystals were prepared by an ionothermal method and were doped in the PVA solution. In the absence of IL@ZIF‐8, the conductivity of the PVA‐only membrane was 2 × 10 –6 S cm –1 at 25 °C; however, among the fabricated membranes, the OH – conductivity of IL@ZIF‐8/PVA/IL containing 20 wt% of IL@ZIF‐8 reached 1.1 × 10 –4 S cm –1 at 25 °C and 9.8 × 10 –4 S cm –1 at 60 °C under 33% RH.…”

Section: Oh–‐conductive Composite Membranes With Porous Materialsmentioning

confidence: 99%

Emerging Porous Solid Electrolytes for Hydroxide Ion Transport

Kang

et al. 2021

Adv Funct Materials

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Anion exchange membrane fuel cells (AEMFCs) offer several advantages over proton exchange membrane fuel cells, such as the use of a non‐precious metal catalyst, but these cells suffer from various issues related to OH–‐conducting electrolytes, including low conductivity and the formation of K2CO3 salt. These issues need to be resolved for the widespread use of AEMFCs. Recently, many studies have focused on developing excellent ion‐conductive electrolytes using porous materials based on metal–organic and covalent organic frameworks. However, most of this research is biased toward proton‐conducting electrolytes; to the best of the authors’ knowledge, reviews addressing OH–‐conducting electrolytes using porous materials have not been reported thus far. This review discusses OH–‐conducting porous crystalline materials and their membranes in terms of different synthetic strategies, conduction mechanisms, and experimental modalities for the design and development of future anion conductive electrolytes in fuel cells.

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Section: Oh–‐conductive Composite Membranes With Porous Materialsmentioning

confidence: 99%

Emerging Porous Solid Electrolytes for Hydroxide Ion Transport

Kang

et al. 2021

Adv Funct Materials

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“…ZIF-8 was also added in a different amount to PVA [134]. To enhance the electrochemical properties at low humidity, choline hydroxide ionic liquids were used in PVA-ZIF-8 system [135]. The conductivities of IL@ZIF-8/IL/PVA composites were tested at 33% of RH and improved from 0.11 mS cm −1 at 25 • C to about 1 mS cm −1 at 60 • C for 20 wt% of IL@ZIF-8.…”

Section: Metal Organic Framework (Mofs)mentioning

confidence: 99%

Anion Exchange Membranes with 1D, 2D and 3D Fillers: A Review

et al. 2021

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Hydroxide exchange membrane fuel cells (AEMFC) are clean energy conversion devices that are an attractive alternative to the more common proton exchange membrane fuel cells (PEMFCs), because they present, among others, the advantage of not using noble metals like platinum as catalysts for the oxygen reduction reaction. The interest in this technology has increased exponentially over the recent years. Unfortunately, the low durability of anion exchange membranes (AEM) in basic conditions limits their use on a large scale. We present in this review composite AEM with one-dimensional, two-dimensional and three-dimensional fillers, an approach commonly used to enhance the fuel cell performance and stability. The most important filler types, which are discussed in this review, are carbon and titanate nanotubes, graphene and graphene oxide, layered double hydroxides, silica and zirconia nanoparticles. The functionalization of the fillers is the most important key to successful property improvement. The recent progress of mechanical properties, ionic conductivity and FC performances of composite AEM is critically reviewed.

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“…To the best of our knowledge, the first example of base-incorporated MOFs, in which counter cations of hydroxide ions provided several ILs, is the cholinium hydroxide@ZIF-8 hybrid composite as described above. 75 Recently, the incorporation of 1-ethyl- 3 Figure 11 and also see Figure 1). 90 This procedure reminds us of the ship-in-bottle method as mentioned above.…”

Section: Ion Distribution and Diffusivitymentioning

confidence: 99%

“…This feature makes it particularly useful as electrolytes for electrochemical devices that operate in the low-temperature region. Another example of IL@ZIF-8, namely, ionothermally synthesized cholinium hydroxide@ZIF-8 hybrid composite (melting point of cholinium hydroxide is unknown), has a much lower σ value of 4 × 10 –7 S cm –1 at 25 °C in 98% RH …”

Section: Ion-conduction In Il@mof Hybrid Compositesmentioning

confidence: 99%

“…There are reports of hydroxide-conducting polymers containing hybrid composites that can be categorized in this section (see below). There are several ion-conducting films containing IL@MOF hybrid composites 75,89,90. A film with a thickness of 30-40 μm was fabricated ) at RT, despite including less mobile bromide anions.Precursors of polymeric ILs, namely, N-vinylimidazole and 4-vinylbenzyl chloride,were impregnated into MIL-101(Cr), and subsequently, the hybrid composite was…”

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confidence: 99%

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Ionic Conduction in Metal–Organic Frameworks with Incorporated Ionic Liquids

Yoshida

Kitagawa

2018

ACS Sustainable Chem. Eng.

115

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Encapsulation of ionic liquids (ILs) into porous materials can provide environmentally benign solid-state electrolytes for various electrochemical devices. In particular, porous metal-organic frameworks (MOFs) enable to tailor their framework and pore structures by varying central metals and organic linkers, as well as the ILs with an unlimited number of possible cation-anion combinations. Therefore, rational materials design based on the accumulated knowledge about the relationship between materials and functionalities is essential for studying IL@MOF hybrid composites with desired properties. In this review, we first introduce synthetic methodologies to incorporate ILs into MOFs, especially based on post-impregnation approach. Interactions and distribution of component ions of the ILs within the MOFs are discussed from the viewpoint of ion mobility, which is responsible for the performance of electrochemical devices. Finally, we devote attention to the ion-conducting properties, including lithium ion, proton, and hydroxide conductions, of the hybrid composites.

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Towards basic ionic liquid-based hybrid membranes as hydroxide-conducting electrolytes under low humidity conditions

Abstract: We have developed basic ionic liquid-based hybrid membranes with ionic liquid modified zeolitic imidazolate frameworks (ZIFs) as fillers, aiming to enhance the electrochemical and physical properties of the membrane.

Cited by 24 publications

References 26 publications

Emerging Porous Solid Electrolytes for Hydroxide Ion Transport

Emerging Porous Solid Electrolytes for Hydroxide Ion Transport

Anion Exchange Membranes with 1D, 2D and 3D Fillers: A Review

Ionic Conduction in Metal–Organic Frameworks with Incorporated Ionic Liquids

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