The preparation of self-humidifying Nafion/various Pt-containing SiO2 composite membranes and their application in PEMFC

Yang, Haoran; Cho, S.H.; Kim, W.J.

doi:10.1016/j.memsci.2012.07.033

Cited by 21 publications

(8 citation statements)

References 43 publications

(43 reference statements)

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“…RH 100%, 60% and 40%), was deteriorated with the increase in SiO 2 content. It might be attributed to two reasons: that is, blocking effect by SiO 2 [45] and the electron loss through the formation of electron conducting path via the network of dispersed Pt-G as reported elsewhere [57][58][59][60]. It has been well known that the perfluorosulfonated polymer, Nafion ™ has SO 3À branch attached to C-F backbones.…”

Section: Sample Pt Species On Surfacementioning

confidence: 80%

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Self-humidifying Pt–graphene/SiO2 composite membrane for polymer electrolyte membrane fuel cell

Lee

Yang

Park

et al. 2015

Journal of Membrane Science

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Section: Sample Pt Species On Surfacementioning

confidence: 80%

“…The OCV test was performed at 80 1C and different relative humidity (RH) with H 2 and O 2 flows of 100 cm 3 min À 1 [45]. Before starting the OCV test, the MEA was stabilized for 12 h at 80 1C.…”

Section: Open Circuit Voltage (Ocv) Testmentioning

confidence: 99%

Self-humidifying Pt–graphene/SiO2 composite membrane for polymer electrolyte membrane fuel cell

Lee

Yang

Park

et al. 2015

Journal of Membrane Science

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“…Likewise, the modification of hygroscopic materials with acidic sources has shown great potential for the simultaneous improvement of water retention and proton conductivity in the PEMs [71]. Yang et al functionalized SiO 2 particles by dispersing them in a 3 M sulfuric acid solution at 150-160 • C and fabricated sulfonated Pt-SiO 2 /Nafion self-humidifying PEMs with an additive content of 1.5-3.0 wt % [72]. The sulfonated Pt-SiO 2 /Nafion nanocomposite PEM with 1.5 wt % additive content demonstrated comparable PEFC performance at dry condition and 80 • C with the fully humidified Nafion with the same thickness, where the 0.45 A cm −2 was achieved at 0.6 V. In another study, various media such as H 2 SO 4 and HSO 3 Cl for the sulfonation process of Pt-SiO 2 particles were used, and it was found that sulfonation with Na 2 SO 4 leads to incredibly high proton conductivity (60 mS cm −1 , 60 • C) and OCV value (0.93 V) at dry conditions for Pt-SiO 2 /Nafion self-humidifying PEM because of the smallest Pt nanoparticle size (1.92 nm) and excellent quality of additive dispersion [73].…”

Section: Self-humidifying Pems Incorporated With Highly Proton-conductive Additivesmentioning

confidence: 99%

“…[70] Functionalization can provide more proton-conductive sites. [72] High ohmic resistance (proton conductors)…”

Section: High Ohmic Resistance (Hygroscopic Additives)mentioning

confidence: 99%

Self-Humidifying Proton Exchange Membranes for Fuel Cell Applications: Advances and Challenges

2020

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Polymer electrolyte fuel cells (PEFCs) provide efficient and carbon-free power by converting the hydrogen chemical energy. The PEFCs can reach their greatest performance in humidified condition, as proton exchange membranes (PEMs) should be humidified for their proton transportation function. Thus, external humidifiers are commonly employed to increase the water content of reactants. However, being burdened with external humidifiers can make the control of PEFCs complicated and costly, in particular for transportation application. To overcome this issue, self-humidifying PEMs have been introduced, with which PEFC can be fed by dry reactants. In fact, internal humidification is accomplished by produced water from the recombination of permeated hydrogen and oxygen gases on the incorporated platinum catalysts within the PEM. While the water production agent remains constant, there is a broad range of additives that are utilized to retain the generated water and facilitate the proton conduction path in the PEM. This review paper has classified the aforementioned additives in three categories: inorganic materials, proton-conductive materials, and carbon-based additives. Moreover, synthesis methods, preparation procedures, and characterization tests are overviewed. Eventually, self-humidifying PEMs endowed with platinum and different additives are compared from performance and stability perspectives, such as water uptake, proton conductivity, fuel cell performance, gas cross-over, and the overall durability. In addition, their challenges and possible solutions are reviewed. Considering the concerns regarding the long-term durability of such PEMs, it seems that further investigations can be beneficial to confirm their reliability for prolonged PEFC operation.

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“…5,32 Consequently, the optimized ratio of hydrophilic particles can vary from 1.5 to 40 wt %. 22,27 Therefore, there is still room for improvement in this area. The introduction of any new hydrophilic particle structure, or a process that has not yet been adopted, would thus have considerable practical value.…”

Section: ■ Introductionmentioning

confidence: 99%

Low Humidifying Proton Exchange Membrane Fuel Cells with Enhanced Power and Pt–C–h-SiO₂ Anodes Prepared by Electrophoretic Deposition

Huang

Sung

et al. 2016

ACS Sustainable Chem. Eng.

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Hydrophilic anodes were prepared by electrophoretic deposition using a slurry containing hollow SiO2 (h-SiO2) nanospheres and commercial Pt–C nanocatalysts. Low humidifying membrane–electrolyte assemblies (MEAs) were then prepared, which were incorporated into single proton exchange membrane fuel cells (PEMFCs). The effect of humidity on the cell voltage and that of the h-SiO2 mass fraction on the MEA power performance and resistance were examined. The MEA stability was evaluated. Adding h-SiO2 nanospheres to the catalyst increased the Pt mass activity from 1997 to 2657 A/gPt at an operating voltage of 0.6 V at a 100% relative humidity (RH); it increased from 1557 to 2611 A/gPt at 0.6 V and 30% RH. The current density voltage (i–V) and electrochemical-impedance results showed that the addition of h-SiO2 reduced both anode activation loss and ohmic polarization. In addition, the low humidifying MEAs exhibited the same i–V relationship over a wide humidity range. After long-term operation in the absence of moisture, the cell voltage of a standard MEA was found to reduce by 15.55% whereas that of our proposed single cell dropped by only 7.18%. The power density of our proposed MEA was enhanced by a factor of 1.5 relative to a regular MEA.

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The preparation of self-humidifying Nafion/various Pt-containing SiO2 composite membranes and their application in PEMFC

Cited by 21 publications

References 43 publications

Self-humidifying Pt–graphene/SiO2 composite membrane for polymer electrolyte membrane fuel cell

Self-humidifying Pt–graphene/SiO2 composite membrane for polymer electrolyte membrane fuel cell

Self-Humidifying Proton Exchange Membranes for Fuel Cell Applications: Advances and Challenges

Low Humidifying Proton Exchange Membrane Fuel Cells with Enhanced Power and Pt–C–h-SiO₂ Anodes Prepared by Electrophoretic Deposition

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The preparation of self-humidifying Nafion/various Pt-containing SiO2 composite membranes and their application in PEMFC

Cited by 21 publications

References 43 publications

Self-humidifying Pt–graphene/SiO2 composite membrane for polymer electrolyte membrane fuel cell

Self-humidifying Pt–graphene/SiO2 composite membrane for polymer electrolyte membrane fuel cell

Self-Humidifying Proton Exchange Membranes for Fuel Cell Applications: Advances and Challenges

Low Humidifying Proton Exchange Membrane Fuel Cells with Enhanced Power and Pt–C–h-SiO2 Anodes Prepared by Electrophoretic Deposition

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Product

Resources

About

Low Humidifying Proton Exchange Membrane Fuel Cells with Enhanced Power and Pt–C–h-SiO₂ Anodes Prepared by Electrophoretic Deposition