Composite membranes from quaternized chitosan reinforced with surface-functionalized PVDF electrospun nanofibers for alkaline direct methanol fuel cells

Liu, Guoliang; Tsen, Wen‐Chin; Jang, Shin‐Cheng; Hu, Fuqiang; Zhong, Fei; Zhang, Bingqing; Wang, Jie; Liu, Hai; Wang, Guangjin; Wen, Sheng; Gong, Chunli

doi:10.1016/j.memsci.2020.118242

Cited by 56 publications

(34 citation statements)

References 46 publications

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“…Likewise, in theory, decreasing the molecular weight or increasing the content of silane coupling agent coating could help enhance the conductivity of nanofibers. Similar studies were reported using quaternized chitosan reinforced with surface-functionalized PVDF electrospun nanofibers [148], Polyvinyl alcohol (PVA) reinforced composite membranes [149], poly(styrene sulfonic acid)-grafted poly(vinylidene fluoride) reinforced composites [150], Graphene quantum dot reinforced hyperbranched polyamide membrane [151], to improve the DMFC membrane durability.…”

Section: Mitigation Strategies For Membrane Degradationsupporting

confidence: 68%

A Critical Assessment on Functional Attributes and Degradation Mechanism of Membrane Electrode Assembly Components in Direct Methanol Fuel Cells

2021

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Direct methanol fuel cells (DMFC) are typically a subset of polymer electrolyte membrane fuel cells (PEMFC) that possess benefits such as fuel flexibility, reduction in plant balance, and benign operation. Due to their benefits, DMFCs could play a substantial role in the future, specifically in replacing Li-ion batteries for portable and military applications. However, the critical concern with DMFCs is the degradation and inadequate reliability that affect the overall value chain and can potentially impede the commercialization of DMFCs. As a consequence, a reliability assessment can provide more insight into a DMFC component’s attributes. The membrane electrode assembly (MEA) is the integral component of the DMFC stack. A comprehensive understanding of its functional attributes and degradation mechanism plays a significant role in its commercialization. The methanol crossover through the membrane, carbon monoxide poisoning, high anode polarization by methanol oxidation, and operating parameters such as temperature, humidity, and others are significant contributions to MEA degradation. In addition, inadequate reliability of the MEA impacts the failure mechanism of DMFC, resulting in poor efficiency. Consequently, this paper provides a comprehensive assessment of several factors leading to the MEA degradation mechanism in order to develop a holistic understanding.

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Section: Mitigation Strategies For Membrane Degradationsupporting

confidence: 68%

A Critical Assessment on Functional Attributes and Degradation Mechanism of Membrane Electrode Assembly Components in Direct Methanol Fuel Cells

2021

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“…Liu et al prepared composite membranes of quaternized chitosan (QCS) and quaternized silica-coated PVDF (QSiO 2 @PVDF) electrospun NFs. The composite membranes exhibited a high ionic conductivity of 41 mS•cm −1 at 80 • C. Single alkaline fuel cells using the membrane demonstrated a maximum power density of 98.7 mW•cm −2 [126].…”

Section: Nanofiber Composite Aemsmentioning

confidence: 99%

“…The composite membranes exhibited a high ionic conductivity of 41 mS·cm −1 at 80 °C. Single alkaline fuel cells using the membrane demonstrated a maximum power density of 98.7 mW·cm −2 [ 126 ].…”

Section: Applications Of Nanofiber-based Iemsmentioning

confidence: 99%

De Novo Ion-Exchange Membranes Based on Nanofibers

2021

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The unique functions of nanofibers (NFs) are based on their nanoscale cross-section, high specific surface area, and high molecular orientation, and/or their confined polymer chains inside the fibers. The introduction of ion-exchange (IEX) groups on the surface and/or inside the NFs provides de novo ion-exchangers. In particular, the combination of large surface areas and ionizable groups in the IEX-NFs improves their performance through indices such as extremely rapid ion-exchange kinetics and high ion-exchange capacities. In reality, the membranes based on ion-exchange NFs exhibit superior properties such as high catalytic efficiency, high ion-exchange and adsorption capacities, and high ionic conductivities. The present review highlights the fundamental aspects of IEX-NFs (i.e., their unique size-dependent properties), scalable production methods, and the recent advancements in their applications in catalysis, separation/adsorption processes, and fuel cells, as well as the future perspectives and endeavors of NF-based IEMs.

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“…The membrane with 2 wt% of SiO 2 showed the best specific conductivity (3 mS cm −1 ). More recently silica-coated PVDF (SiO 2 @PVDF) electrospun nanofibers were quaternized and inserted in QCS [96]. Tests in alkaline DMFC, performed at various MeOH concentrations, showed a maximum power density at 80 • C up to 99 mW cm −2 (2 M MeOH), presenting only 4% of performance loss after 100 h in chronoamperometry test.…”

Section: Silica and Silicatesmentioning

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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Composite membranes from quaternized chitosan reinforced with surface-functionalized PVDF electrospun nanofibers for alkaline direct methanol fuel cells

Cited by 56 publications

References 46 publications

A Critical Assessment on Functional Attributes and Degradation Mechanism of Membrane Electrode Assembly Components in Direct Methanol Fuel Cells

A Critical Assessment on Functional Attributes and Degradation Mechanism of Membrane Electrode Assembly Components in Direct Methanol Fuel Cells

De Novo Ion-Exchange Membranes Based on Nanofibers

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

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