CHS-WSiA doped hexafluoropropylidene-containing polybenzimidazole composite membranes for medium temperature dry fuel cells

Inorganic-organic composite membranes were prepared by using partly cesium-substituted silicotungstic acid (CHS-WSiA) and polybenzimidazole (PBI, MRS0810H) for medium temperature polymer electrolyte fuel cells (MT-PEFCs). Cesium hydrogen sulfate (CsHSO4, CHS) and silicotungstic acid (H4SiW12O40, WSiA) were milled to obtain 0.5CHS-0.5WSiA composites by dry and wet mechanical millings. N,Ndimethylacetamide (DMAc) was used as a disperse medium in the preparation of the inorganic solid acids by wet mechanical milling and also a casting agent for fabrication of membrane. Finally, flexible and homogeneous composite membranes with several phosphoric acid doping levels (PADLs) were obtained. The wet mechanical milling using DMAc was found to effectively promote good substitution of H+ ion in WSiA by Cs+ ion of CHS and promoted the formation of smaller grain sizes of composites, compared with dry milling. A high maximum power density of 378 mWcm-2 and a good constant current stability test were obtained from a single cell test using the PBI composite membrane containing 20 wt% of 0.5CHS-0.5WSiA from wet milling and phosphoric acid doping level (PADL) of 8 mol, at 150 °C under an anhydrous condition. Wet milling CHS-WSiA crystallites were highly dispersed in PBI to give homogenized membranes and played a significant role in the enhancemance of acidity by increasing the number of proton sites in the electrolyte membrane. After the addition of CHS-WSiA into PBI membrane, the acid and water retention properties were improved and incorporated as new proton conduction path by adsorbing phosphoric acid in these composite electrolyte membranes. These observations suggest that composite membranes with 8 mol of PADL are good promising PA dopedmembranes with effective electrochemical properties for the medium temperature fuel cells.

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Nafion®/ODF-silica composite membranes for medium temperature proton exchange membrane fuel cells

Journal of Power Sources ◽

10.1016/j.jpowsour.2013.01.178 ◽

2014 ◽

Vol 246 ◽

pp. 950-959 ◽

Cited By ~ 27

Author(s):

Yaowapa Treekamol ◽

Mauricio Schieda ◽

Lucie Robitaille ◽

Sean M. MacKinnon ◽

Asmae Mokrini ◽

...

Keyword(s):

Fuel Cells ◽

Proton Exchange Membrane ◽

Composite Membranes ◽

Proton Exchange ◽

Medium Temperature ◽

Silica Composite ◽

Exchange Membrane

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New Preparation Methods for Composite Membranes for Medium Temperature Fuel Cells Based on Precursor Solutions of Insoluble Inorganic Compounds

Fuel Cells ◽

10.1002/fuce.200400070 ◽

2005 ◽

Vol 5 (3) ◽

pp. 366-374 ◽

Cited By ~ 57

Author(s):

G. Alberti ◽

M. Casciola ◽

M. Pica ◽

T. Tarpanelli ◽

M. Sganappa

Keyword(s):

Fuel Cells ◽

Inorganic Compounds ◽

Composite Membranes ◽

Medium Temperature ◽

Preparation Methods

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Proton conductivity and characterization of novel composite membranes for medium-temperature fuel cells

Desalination ◽

10.1016/j.desal.2005.06.069 ◽

2006 ◽

Vol 193 (1-3) ◽

pp. 387-397 ◽

Cited By ~ 49

Author(s):

M.I. Ahmad ◽

S.M.J. Zaidi ◽

S.U. Rahman

Keyword(s):

Fuel Cells ◽

Proton Conductivity ◽

Composite Membranes ◽

Medium Temperature

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Directly deposited Nafion/TiO2 composite membranes for high power medium temperature fuel cells

RSC Advances ◽

10.1039/c5ra27462a ◽

2016 ◽

Vol 6 (29) ◽

pp. 24261-24266 ◽

Cited By ~ 19

Author(s):

Niklas Wehkamp ◽

Matthias Breitwieser ◽

Andreas Büchler ◽

Matthias Klingele ◽

Roland Zengerle ◽

...

Keyword(s):

Fuel Cells ◽

Fuel Cell ◽

High Power ◽

Composite Membranes ◽

Production Method ◽

Medium Temperature ◽

Operation Temperature ◽

Simple Production

This work presents a simple production method for TiO2 reinforced Nafion® membranes which are stable up to a 120 °C operation temperature and achieve record breaking fuel cell efficiencies.

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Efficient Chitosan/Nitrogen-Doped Reduced Graphene Oxide Composite Membranes for Direct Alkaline Ethanol Fuel Cells

International Journal of Molecular Sciences ◽

10.3390/ijms22041740 ◽

2021 ◽

Vol 22 (4) ◽

pp. 1740 ◽

Cited By ~ 1

Author(s):

Selestina Gorgieva ◽

Azra Osmić ◽

Silvo Hribernik ◽

Mojca Božič ◽

Jurij Svete ◽

...

Keyword(s):

Fuel Cells ◽

Composite Membranes ◽

Nanocomposite Membranes ◽

Ethanol Fuel ◽

Direct Ethanol Fuel Cells ◽

Graphene Oxides ◽

Reduced Graphene ◽

Structure Morphology ◽

Graphene Derivatives ◽

Doped Graphene

Herein, we prepared a series of nanocomposite membranes based on chitosan (CS) and three compositionally and structurally different N-doped graphene derivatives. Two-dimensional (2D) and quasi 1D N-doped reduced graphene oxides (N-rGO) and nanoribbons (N-rGONRs), as well as 3D porous N-doped graphitic polyenaminone particles (N-pEAO), were synthesized and characterized fully to confirm their graphitic structure, morphology, and nitrogen (pyridinic, pyrrolic, and quaternary or graphitic) group contents. The largest (0.07%) loading of N-doped graphene derivatives impacted the morphology of the CS membrane significantly, reducing the crystallinity, tensile properties, and the KOH uptake, and increasing (by almost 10-fold) the ethanol permeability. Within direct alkaline ethanol test cells, it was found that CS/N rGONRs (0.07 %) membrane (Pmax. = 3.7 mWcm−2) outperformed the pristine CS membrane significantly (Pmax. = 2.2 mWcm−2), suggesting the potential of the newly proposed membranes for application in direct ethanol fuel cells.

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