Nafion®/SiO<sub>2</sub>/m-BOT composite membranes for improved direct methanol fuel cell performance

Wang, Yituo; Han, Guimei; Tian, Zhe; Wang, Meng; Li, Jianling; Wang, Xindong

doi:10.1039/c4ra06365a

Cited by 17 publications

(9 citation statements)

References 27 publications

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“…In the case of ion-exchange membranes, this approach is more often used to increase their ionic conductivity. For this purpose, nanoparticles of hydrophilic materials, such as silica [ 180 , 181 , 182 , 183 , 184 , 185 , 186 , 187 ], or other oxides [ 188 , 189 , 190 , 191 , 192 , 193 , 194 , 195 , 196 , 197 , 198 , 199 ] are used. This often leads to an increase in the membrane water uptake, and therefore it is often believed to be the reason for the conductivity increase.…”

Section: Hybrid Membranesmentioning

confidence: 99%

Selectivity of Transport Processes in Ion-Exchange Membranes: Relationship with the Structure and Methods for Its Improvement

Стенина

Голубенко

Nikonenko

et al. 2020

IJMS

127

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Nowadays, ion-exchange membranes have numerous applications in water desalination, electrolysis, chemistry, food, health, energy, environment and other fields. All of these applications require high selectivity of ion transfer, i.e., high membrane permselectivity. The transport properties of ion-exchange membranes are determined by their structure, composition and preparation method. For various applications, the selectivity of transfer processes can be characterized by different parameters, for example, by the transport number of counterions (permselectivity in electrodialysis) or by the ratio of ionic conductivity to the permeability of some gases (crossover in fuel cells). However, in most cases there is a correlation: the higher the flux density of the target component through the membrane, the lower the selectivity of the process. This correlation has two aspects: first, it follows from the membrane material properties, often expressed as the trade-off between membrane permeability and permselectivity; and, second, it is due to the concentration polarization phenomenon, which increases with an increase in the applied driving force. In this review, both aspects are considered. Recent research and progress in the membrane selectivity improvement, mainly including a number of approaches as crosslinking, nanoparticle doping, surface modification, and the use of special synthetic methods (e.g., synthesis of grafted membranes or membranes with a fairly rigid three-dimensional matrix) are summarized. These approaches are promising for the ion-exchange membranes synthesis for electrodialysis, alternative energy, and the valuable component extraction from natural or waste-water. Perspectives on future development in this research field are also discussed.

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Section: Hybrid Membranesmentioning

confidence: 99%

Selectivity of Transport Processes in Ion-Exchange Membranes: Relationship with the Structure and Methods for Its Improvement

Стенина

Голубенко

Nikonenko

et al. 2020

IJMS

127

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“…In accordance to the literature, in the composite approach, the extent of methanol crossover largely depends on the distribution of fillers and their effective interaction with the polymer matrix [ 35 ]. The uniform distribution of fillers in Nafion membranes reduces the size of channels that are available for methanol passage, whereas particles agglomeration has a negative impact on methanol crossover.…”

Section: Resultsmentioning

confidence: 56%

Composite Nafion-CaTiO3-δ Membranes as Electrolyte Component for PEM Fuel Cells

et al. 2020

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Manufacturing new electrolytes with high ionic conductivity has been a crucial challenge in the development and large-scale distribution of fuel cell devices. In this work, we present two Nafion composite membranes containing a non-stoichiometric calcium titanate perovskite (CaTiO3−δ) as a filler. These membranes are proposed as a proton exchange electrolyte for Polymer Electrolyte Membrane (PEM) fuel cell devices. More precisely, two different perovskite concentrations of 5 wt% and 10 wt%, with respect to Nafion, are considered. The structural, morphological, and chemical properties of the composite membranes are studied, revealing an inhomogeneous distribution of the filler within the polymer matrix. Direct methanol fuel cell (DMFC) tests, at 110 °C and 2 M methanol concentration, were also performed. It was observed that the membrane containing 5 wt% of the additive allows the highest cell performance in comparison to the other samples, with a maximum power density of about 70 mW cm−2 at 200 mA cm−2. Consequently, the ability of the perovskite structure to support proton carriers is here confirmed, suggesting an interesting strategy to obtain successful materials for electrochemical devices.

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“…Nafion possesses high methanol permeability because of its widened hydrophilic channels, and partially blocking these channels will significantly reduce the crossover. In the composite approach, the extent of methanol crossover largely depends on the distribution of fillers and their effective interaction with the polymer matrix [30]. The uniform distribution of added fillers in Nafion membranes reduces the size of channels that are available for methanol passage whereas immense agglomeration has a negative impact on methanol crossover.…”

Section: Slmentioning

confidence: 99%

A Nafion-Ceria Composite Membrane Electrolyte for Reduced Methanol Crossover in Direct Methanol Fuel Cells

2017

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An alternative Nafion composite membrane was prepared by incorporating various loadings of CeO 2 nanoparticles into the Nafion matrix and evaluated its potential application in direct methanol fuel cells (DMFCs). The effects of CeO 2 in the Nafion matrix were systematically studied in terms of surface morphology, thermal and mechanical stability, proton conductivity and methanol permeability. The composite membrane with optimum filler content (1 wt. % CeO 2 ) exhibits a proton conductivity of 176 mS·cm −1 at 70 • C, which is about 30% higher than that of the unmodified membrane. Moreover, all the composite membranes possess a much lower methanol crossover compared to pristine Nafion membrane. In a single cell DMFC test, MEA fabricated with the optimized composite membrane delivered a peak power density of 120 mW·cm −2 at 70 • C, which is about two times higher in comparison with the pristine Nafion membrane under identical operating conditions.

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Nafion®/SiO₂/m-BOT composite membranes for improved direct methanol fuel cell performance

Abstract: Bentonite (BOT) has excellent hygroscopicity and large specific surface, so it is chosen as a dopant of Nafion® membranes in this paper.

Cited by 17 publications

References 27 publications

Selectivity of Transport Processes in Ion-Exchange Membranes: Relationship with the Structure and Methods for Its Improvement

Selectivity of Transport Processes in Ion-Exchange Membranes: Relationship with the Structure and Methods for Its Improvement

Composite Nafion-CaTiO3-δ Membranes as Electrolyte Component for PEM Fuel Cells

A Nafion-Ceria Composite Membrane Electrolyte for Reduced Methanol Crossover in Direct Methanol Fuel Cells

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Nafion®/SiO2/m-BOT composite membranes for improved direct methanol fuel cell performance

Abstract: Bentonite (BOT) has excellent hygroscopicity and large specific surface, so it is chosen as a dopant of Nafion® membranes in this paper.

Cited by 17 publications

References 27 publications

Selectivity of Transport Processes in Ion-Exchange Membranes: Relationship with the Structure and Methods for Its Improvement

Selectivity of Transport Processes in Ion-Exchange Membranes: Relationship with the Structure and Methods for Its Improvement

Composite Nafion-CaTiO3-δ Membranes as Electrolyte Component for PEM Fuel Cells

A Nafion-Ceria Composite Membrane Electrolyte for Reduced Methanol Crossover in Direct Methanol Fuel Cells

Contact Info

Product

Resources

About

Nafion®/SiO₂/m-BOT composite membranes for improved direct methanol fuel cell performance