Nanoporous PBI membranes by track etching for high temperature PEMs

Eguizábal, A.; Sgroi, Mauro Francesco; Pullini, D.; Ferain, Etienne; Pina, M.P.

doi:10.1016/j.memsci.2013.12.006

Cited by 29 publications

(13 citation statements)

References 33 publications

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“…Generally, for PBI membranes, high PA doping levels (acid doping levels, ADLs) are preferable to achieve good conduction and consequently high-efficiency HT-PEMFCs. Various strategies have been proposed to increase ADLs, for instance, synthesizing new PBIs with highly basic N -heterocycles (e.g., imidazole and pyridine) − or other acidophilic groups (e.g., amino, hydroxyl, and sulfonic acid groups); − introducing alternative quaternized ammonium groups having more effective interactions with PA molecules into membranes; preparing PBI membranes with porous structures , or functional inorganic particles; , and fabricating PBI membranes by sol–gel methods. , In spite of great improvements in ADLs and conductivity, membrane dimensional–mechanical stability is seriously compromised because of the strong “plasticizing effect” of PA, leading to significantly decreased cell properties. For example, after obtaining an ADL of 10.7, the tensile strength of PBI membrane drastically decreased from 111.3 to 3.3 MPa .…”

Section: Introductionmentioning

confidence: 99%

Highly Conductive and Mechanically Stable Imidazole-Rich Cross-Linked Networks for High-Temperature Proton Exchange Membrane Fuel Cells

et al. 2020

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Phosphoric acid-doped polybenzimidazole (PA-PBI) used in high-temperature proton exchange membranes (HT-PEMs) frequently suffers from a serious loss of mechanical strength because of the “plasticizing effect” of the dopant acid. Conventional cross-linking approaches generally enhance membrane stability. However, acid doping levels (ADLs) and consequently proton conductivity inevitably decrease. This is due to the formation of more compact molecular structures and a reduced amount of functional imidazole units, caused by their consumption in introducing the cross-linker. To resolve the common problems of current PA-PBI-based HT-PEMs, herein, a highly acidophilic imidazole-rich cross-linked network with superior “antiplasticizing” ability is constructed based on a novel multifunctional cross-linker. This unique bischloro/bibenzimidazole (“A2B2-type”) molecular structure has extremely high reactivity, including “self-reaction” among the cross-linkers and “inter-reaction” between the cross-linker and PBI molecules. The resulting imidazole-rich cross-linked membranes exhibit the desired combination of high ADLs, high conductivity, outstanding dimensional–mechanical stability, and excellent fuel cell performance. In comparison to a corresponding linear PBI membrane, one membrane with a high content of the cross-linker of 30% has a 100 wt % increased acid uptake, a doubling in proton conductivity at 200 °C, and a maximum power density of 533 mW·cm–2 at 160 °C without humidification.

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Section: Introductionmentioning

confidence: 99%

Highly Conductive and Mechanically Stable Imidazole-Rich Cross-Linked Networks for High-Temperature Proton Exchange Membrane Fuel Cells

et al. 2020

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“…A variety of new materials [for example, polymers ( 4 – 8 ), biopolymers ( 9 – 12 ), and inorganic nanomaterials ( 13 – 23 )] and novel fabrication methods [for example, block copolymer self-assembly ( 5 , 6 , 8 ), template synthesis ( 7 , 15 ), track-etching technique ( 23 , 24 ), chemical vapor deposition ( 25 , 26 ), and layer-by-layer assembly ( 27 )] have been developed to improve the purification efficiency of these membranes. However, preparing low-cost water purification membranes while retaining mechanical strength and high purification performance remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

Design and function of biomimetic multilayer water purification membranes

et al. 2017

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“…Polymer-based electrolyte membranes have been significantly analyzed in recent times for the advancement of a new generation of PEMs that are suitable for applications at high-temperature. ,,, Among these, polybenzimidazole (poly[2,2-(m-phenylene)-5,5-bibenzimidazole]) (PBI) membranes have taken extensive attention by increasing the temperature tolerance of conventional PEM materials; this is due to PBI’s excellent chemical and thermal stability. − PBI belongs to a big family of aromatic heterocyclic polymers having benzimidazole units. The strong hydrogen bonding among the =N and −NH– groups in PBI is the major molecular force, which results in close chain packing.…”

Section: High-temperature Pems Composed Of Electrospun Nanofibersmentioning

confidence: 99%

Nanofiber-Based Proton Exchange Membranes: Development of Aligned Electrospun Nanofibers for Polymer Electrolyte Fuel Cell Applications

Kallem

Yanar

Choi

2018

ACS Sustainable Chem. Eng.

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To ensure sustainable energy and environments for the future, nanotechnology is continuing to contribute new solutions and prospects. Materials with nanofibrous structures are attractive when it comes to addressing several energy issues. Carbon-based fuel dependability is an especial concern, since employing this fuel results in the constant discharge of enormous amounts of greenhouse gas emissions into the ecosphere as well as diminishing fossil fuel reserves. Hence, it is urgent to decrease the reliance on fossil fuels and focus on using renewable sources, such as solar and hydrogen energy. As a result of the recent challenges associated with society’s current energy needs and emerging ecological concerns, the pursuit of novel, low-cost, and environmentally friendly energy conversion and storage devices has attracted growing attention. Because of their high efficiency, high power density, and low greenhouse gas emissions, polymer electrolyte membrane fuel cells (PEMFCs) have drawn extensive interest as energy sources for automobiles, portable electronics, and residential power generation. The main challenges associated with PEMFC concern the development of a robust, durable, low-cost proton exchange membrane (PEM). In this regard, electrospinning has generated considerable interest as a promising method for fabricating nanofiber-based PEMs owing to the specific properties associated with its advanced features, including its high surface area, low density, high pore volume, and easy scale-up. This review summarizes the recent work on the development of PEMs based on electrospun nanofibers and gives a brief overview of the fabrication, properties, and fuel cell application. In addition, this review briefly highlights the strategies utilized for the recent developments of nanofiber-based PEMs for high-temperature PEMFCs, as discussed in the recent literature.

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Nanoporous PBI membranes by track etching for high temperature PEMs

Cited by 29 publications

References 33 publications

Highly Conductive and Mechanically Stable Imidazole-Rich Cross-Linked Networks for High-Temperature Proton Exchange Membrane Fuel Cells

Highly Conductive and Mechanically Stable Imidazole-Rich Cross-Linked Networks for High-Temperature Proton Exchange Membrane Fuel Cells

Design and function of biomimetic multilayer water purification membranes

Nanofiber-Based Proton Exchange Membranes: Development of Aligned Electrospun Nanofibers for Polymer Electrolyte Fuel Cell Applications

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