Preparation of highly dispersed SiO2 and Pt particles in Nafion®112 for self-humidifying electrolyte membranes in fuel cells

Hagihara, Hiroaki; Uchida, Hiroyuki; Watanabe, Masahiro

doi:10.1016/j.electacta.2005.11.012

Cited by 106 publications

(66 citation statements)

References 24 publications

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“…38 The location of the Pt band is determined by the local mixed potential distribution. [39][40][41][42] Many authors believe that Pt in the membrane increases membrane degradation. [43][44][45][46][47] Synthetic methods of planting Pt in the membrane have been shown to have a detrimental effect on the membrane, 48,49 where platinum ions can act as a Fenton's reaction promoter.…”

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confidence: 99%

Accelerated Membrane Durability Testing of Heavy Duty Fuel Cells

Macauley

Alavijeh

Watson

et al. 2014

J. Electrochem. Soc.

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Regular durability testing of heavy duty fuel cell systems for transit bus application requires several thousand hours of operation, which is costly and time consuming. Alternatively, accelerated durability tests are able to generate failure modes observed in field operation in a compressed time period, by applying enhanced levels of stress. The objective of the present work is to design and validate an accelerated membrane durability test (AMDT) for heavy duty fuel cells under bus related conditions. The proposed AMDT generates bus relevant membrane failure modes in a few hundred hours, which is more than an order of magnitude faster than for regular duty cycle testing. Elevated voltage, temperature, and oxidant levels are used to accelerate membrane chemical stress, while relative humidity (RH) cycling is used to induce mechanical stress. RH cycling is found to significantly reduce membrane life-time compared to constant RH conditions. The role of a platinum band in the membrane is investigated and membranes with Pt bands demonstrate a considerable life-time extension under AMDT conditions, with minimal membrane degradation. Overall, this research serves to establish a benchmark AMDT that can rapidly and reliably evaluate membrane stability under simulated heavy duty fuel cell conditions.

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confidence: 99%

Accelerated Membrane Durability Testing of Heavy Duty Fuel Cells

Macauley

Alavijeh

Watson

et al. 2014

J. Electrochem. Soc.

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“…Upon hydrolysis of P(VDF-co-CTFE)-g-P(SSAco-TMSPMA) graft copolymer, the absorption band at 1162 cm -1 became prominent, which is due to the formation of Si-O-Si (Figure 2(c)). 40,41 After introduction of TEOS and hydrolysis at acidic condition, the absorption band at 1162 cm -1 was also clearly observed (Figure 2(d)). In addition, the broad absorption band at 3457 cm -1 became intense, which is attributed to the water bounded to ionic groups of the membranes.…”

Section: Resultsmentioning

confidence: 69%

Nanocomposite proton conducting membranes based on amphiphilic PVDF graft copolymer

et al. 2010

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A novel comb-like amphiphilic graft copolymer of poly(vinylidene fluoride-co-chlorotrifluoroethylene)-graft-poly(4-styrene sulfonic acid-co-trimethoxysilyl propyl methacrylate), i.e. P(VDF-co-CTFE)-g-P(SSA-co-TMSPMA) was synthesized using an atom transfer radical polymerization (ATRP) technique. Successful synthesis and a microphase-separated structure of the copolymer were confirmed by proton nuclear magnetic resonance ( 1 H NMR), FTIR spectroscopy and transmission electron microscopy (TEM). This graft copolymer was combined with tetraethoxysilane (TEOS) under acidic conditions to produce organic-inorganic nanocomposite membranes through an in-situ sol-gel reaction between TEOS and PTMSPMA, as characterized by X-ray diffraction (XRD) and TEM. Upon the introduction of silica, the proton conductivity and water uptake of the membranes decreased slightly but the thermal and mechanical properties of the membranes were enhanced significantly. Various morphologies of the nanocomposite membranes were obtained after controlling the TEOS concentration, which were correlated with the thermal, mechanical and transport properties.

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“…In some cases, the composite membranes become "self-humidified" due to the back diffusion of water generated in the cathode region 99 . To improve the conductivity of such membranes it was suggested 100 to include nanoscale platinum into a polymer matrix, where oxidation of hydrogen with oxygen will occur to form water. Due to the low alcohol permeability of the composite membranes, and higher operating temperature, their use in fuel cells of direct methanol oxidation is very efficient, the specific power of the cell at 145°C and a voltage of 0.5 V can achieve up to 350 mA / cm 2 .…”

Section: Composite Materials For Polymer Electrolytesmentioning

confidence: 99%

Proton-Exchange Membranes Based on Sulfonated Polymers

Sedesheva¹,

Ivanov²,

Wozniak³

et al. 2016

Orient. J. Chem

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Review is dedicated to discussion of different types of proton-exchange membranes used in fuel cells (FC). One of the most promising electrolytes is polymer electrolyte membrane (PEM). In recent years, researchers pay great attention to various non-fluorinated or partially fluorinated hydrocarbon polymers, which may become a real alternative to Nafion. Typical examples are sulfonated polyetheretherketones, polyarylene ethers, polysulphones, polyimides. A class of polyimides-based hydrocarbon proton-exchange membranes is separately considered as promising for widespread use in fuel cell, such membranes are of interest for our further experimental development.

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Preparation of highly dispersed SiO2 and Pt particles in Nafion®112 for self-humidifying electrolyte membranes in fuel cells

Cited by 106 publications

References 24 publications

Accelerated Membrane Durability Testing of Heavy Duty Fuel Cells

Accelerated Membrane Durability Testing of Heavy Duty Fuel Cells

Nanocomposite proton conducting membranes based on amphiphilic PVDF graft copolymer

Proton-Exchange Membranes Based on Sulfonated Polymers

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