Polyimide nonwoven fabric-reinforced, flexible phosphosilicate glass composite membranes for high-temperature/low-humidity proton exchange membrane fuel cells

Lim, Jun; Won, Ji Hye; Lee, Hyeon Ji; Hong, Young Taik; Lee, Moo Seok; Ko, Chang Hyun; Lee, Sang Young

doi:10.1039/c2jm33406b

Cited by 27 publications

(12 citation statements)

References 34 publications

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“…An overview of membranes incorporating inert electrospun nanofibres is shown in Table 1. Typical polymers that have been used to produce electrospun reinforcements include polyvinylidene fluoride (PVDF), polyvinyl alcohol (PVA), polystyrene (PS), polysulfone (PSU and polyimide (PI) [63][64][65][66][67][68][69][70][71][72][73][74][75].…”

Section: Composite Membranes Comprising An Electrospun Mat Of Unchargmentioning

confidence: 99%

“…These results are attributed to ionic cross-linking with partial proton transfer from the ionomer to the basic sites of PBI nanofibres in the electrospun web, which improves the interface and the cohesion between the mat and the ionomer. [66,67]. The flexibility of the composite membranes was improved over that of the silicate glass type membrane ( Figure 8) [67], and the proton conductivity at 80 °C and 80 % RH of the GPTMS/THPSA = 1/9 composite membrane (166 mS/cm) was higher than that of Nafion ® (70 mS/cm) or sulfonated polysulfone (37 mS/cm), which the authors attributed to the presence of a highly interconnected network of densely concentrated acid groups (IEC ca.…”

Section: Composite Membranes Comprising An Electrospun Mat Of Unchargmentioning

confidence: 99%

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Electrospun nanofibre composite polymer electrolyte fuel cell and electrolysis membranes

et al. 2016

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International audienceLarge-scale commercialisation of Proton Exchange Membrane Fuel Cell (PEMFC) technology for automotive and stationary applications demands the development of a robust, durable and cost-effective materials. In this regard, ionomer membranes being present at the core of PEMFCs are required to maintain elevated proton conductivity, high mechanical strength and low gas permeability during the lifespan of the fuel cell. These challenges are addressed by investigating novel nano-structured membrane materials possessing long-range spatial organisation of ionic and hydrophobic domains at the micro-and nano-scales. Electrospinning, a versatile and easily up-scalable tool for the preparation of nanofibrous polymers and ceramics with targeted architectures, is being extensively applied for the development of nanostructured electrolyte membranes. This review describes the most important advances in the use of electrospun materials for the preparation of new generation fuel cell proton conducting membranes. It also highlights the challenges to be overcome and the new directions and future application fields of composite nanofibre-based membranes in the broader context of energy materials

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Section: Composite Membranes Comprising An Electrospun Mat Of Unchargmentioning

confidence: 99%

Section: Composite Membranes Comprising An Electrospun Mat Of Unchargmentioning

confidence: 99%

Electrospun nanofibre composite polymer electrolyte fuel cell and electrolysis membranes

et al. 2016

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“…High phosphate content silicophosphate glasses are known for the presence of sixfold‐coordinated silicon even when prepared at ambient pressure . They are of potential interest for various applications, for example, optical fibers or in fuel cells . However, owing to their low chemical durability their use is still limited.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12] They are of potential interest for various applications, for example, optical fibers 13,14 or in fuel cells. 14,15 However, owing to their low chemical durability their use is still limited. The addition of Al 2 O 3 to phosphate glasses not only affects the glass structure but also promotes chemical durability and improves the resistance to moisture invasion, [16][17][18][19][20][21] and the effect of Al 3+ ions has been described as strengthening the glass.…”

Section: Introductionmentioning

confidence: 99%

Modification of silicophosphate glass composition, structure, and properties via crucible material and melting conditions

Sawangboon

Nizamutdinova

Uesbeck

et al. 2019

Int J of Appl Glass Sci

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Ceramic crucibles are known to corrode in contact with glass melts. Here, we investigate the effect of alumina and fused silica crucibles on the composition, structure, and properties of silicophosphate glasses. Glasses in the system 0.3 Na2O‐0.6 P2O5‐0.1 SiO2 were melted in platinum, alumina, or fused silica crucibles at 900°C or 1200°C for 0.5‐12 hours. Al2O3 and SiO2 were found to leach from the crucibles into the glass melt and alter the glass composition: Al2O3 content increased with melting temperature and time, resulting in up to 10 mol% Al2O3; SiO2 from fused silica crucibles was also introduced into the glass, resulting in a 25% higher SiO2 content compared to the nominal composition. Glass density, transition temperature, thermal expansion, and mechanical properties were strongly affected by these compositional changes. Based on vibrational spectroscopy, this is explained by increasing numbers of P–O–Al or P–O–Si bonds, resulting in a depolymerization of the phosphate network, and ionic cross‐linking by high field strength aluminum or silicon ions. With increasing alumina content, P–O–Si bonds were replaced by P–O–Al bonds. 31P and 27Al MAS NMR spectra revealed that aluminum is present in sixfold coordination exclusively and fully bonded to phosphate species, connecting phosphate groups by P–O–Al–O–P bonds.

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“…In recent years, silicophosphate glasses have been investigated for its unique properties such as good mechanical properties, chemical stability and photosensitivity [1][2][3][4]. Silicophosphate glasses can be applied in many aspects such as fuel cell, optical fibers, biomaterials and optical amplifiers [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effects of SiO2 on properties and structures of neodymium doped P2O5-Al2O3-Li2O-MgO-Sb2O3 glasses

Wang

Muñoz

et al. 2017

Journal of Alloys and Compounds

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Effects of substitutions of SiO 2 for Al 2 O 3 and P 2 O 5 in a single baseline phosphate glass, Nd 3+ : Li 2 O-MgO-Al 2 O 3 -P 2 O 5 , on glass structure and properties are investigated. For glasses with Al 2 O 3 replaced by SiO 2 , coordination number of Al becomes larger, and P=O bond and Si with six oxygens coordinated emerge. For glasses with P 2 O 5 replaced, coordination number of Al becomes smaller, P(Q 2 ) changes to P(Q 1 ) and all Si units are four coordinated. The reason for coordination number of Al and Si change may come from the variation of terminal oxygen quantity. The relationship between glass structure and physical (, T g , CTE), mechanical (E), and optical properties (n D ,  em ,  em ) are builded.

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Polyimide nonwoven fabric-reinforced, flexible phosphosilicate glass composite membranes for high-temperature/low-humidity proton exchange membrane fuel cells

Cited by 27 publications

References 34 publications

Electrospun nanofibre composite polymer electrolyte fuel cell and electrolysis membranes

Electrospun nanofibre composite polymer electrolyte fuel cell and electrolysis membranes

Modification of silicophosphate glass composition, structure, and properties via crucible material and melting conditions

Effects of SiO2 on properties and structures of neodymium doped P2O5-Al2O3-Li2O-MgO-Sb2O3 glasses

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