scholarly journals Unprecedented SPEEK-trimetal Oxide Composites: Physicochemical and Electrochemical Performance in Fuel Cell

2021 ◽  
Author(s):  
Gandhimathi Sivasubramanian ◽  
Senthil Andavan Gurusamy Thangavelu ◽  
Berlina Maria Mahimai ◽  
Krishnan Hariharasubramanian ◽  
PARADESI DEIVANAYAGAM
Keyword(s):  
Fuel Cell ◽  
Electrochemical Performance ◽  
Composite Membrane ◽  
Composite Membranes ◽  
Membrane Electrode Assembly ◽  
Membrane Electrode ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Maximum Water ◽  
Oxide Composites

Abstract Advanced polymer composite membranes were prepared from a linear sulfonated poly(ether ether ketone) (SPEEK) with bismuth cobalt zinc oxide [BCZO, (Bi2O3)0.07(CoO)0.03(ZnO)0.90] nanopowder as an inorganic additive for the application of H2-O2 fuel cell. Morphology data tend to provide evidences for the incorporation of BCZO into SPEEK polymer. Indeed, composite membrane loaded with 7.5 wt.% of BCZO was identified to uptake maximum water, while the pristine SPEEK membrane occurred to retain only 24.0 %. As such SPEEK matrix loaded with 7.5 wt.% of BCZO was found to exhibit the maximum proton conductivity of 0.030 S cm-1, whereas the pristine membrane was restricted to 0.021 S cm-1. Evidently, TGA profile of the composite membrane was measured to exhibit sufficient thermal stability to employ as electrolyte in fuel cell. The membrane electrode assembly of pristine SPEEK and SP-BCZO-7.5 wt.% membranes were fabricated and studied for their electrochemical performance. Indeed, the characteristics of newly developed composite membranes led to possess incredible feature towards fuel cell applications.

Study of the Variation of Catalyst Loading in Cathode for SPEEK/CSMM Membrane in Direct Methanol Fuel Cell (DMFC)

2014 ◽  
Vol 69 (9) ◽  
Author(s):  
S. E. Rosli ◽  
M. N. A. Mohd-Norddin ◽  
J. Jaafar ◽  
R. Sudirman
Keyword(s):  
Fuel Cell ◽  
Membrane Electrode Assembly ◽  
Cathode Side ◽  
Catalyst Loading ◽  
Methanol Permeability ◽  
Membrane Electrode ◽  
Anode Catalyst ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Direct Methanol

Variation of anode catalyst loading for modified sulfonated poly (ether ether ketone) (SPEEK) with charged surface modifying macromolecules (cSMM) membrane was studied, in order to get the higher performance in DMFC. The best optimal anode catalyst loading was 4 mgcm-2 for 30% Pt/Ru based on our previous result for this application.  The modified SPEEK/CSMM membrane was characterized to ensure of its better performance in term of water uptake and methanol permeability. In cathode side, the effect of 5% and 10% Pd/C  in 2,4 and 6 mgcm-2 of catalyst loading has been investigated with a fuel cell assembly. The preparation method of catalyst ink and membrane electrode assembly (MEA) was based on Dr. Blade method and hot pressing by using catalyzed diffusion media (CDM) method. The air flowrates were varied from 25-1000ml min-1, while 1M methanol concentrations, 1 ml min-1 of methanol flowrate and 60°C operating temperature were kept constant. These parameters were tested on the performance of single cell DMFC with 4 cm2 electrodes.The optimization catalyst loading will enhance the DMFC performance.  It was found, the best optimal cathode catalyst loading was 4 mgcm-2 for 10% Pd/C with  4 mgcm-2 for 30% Pt/Ru in anode side for this application. 

Nafion/PBI Nanofiber Composite Membranes for Fuel Cells Applications

2010 ◽  
Author(s):  
Tzyy-Lung Leon Yu ◽  
Shih-Hao Liu ◽  
Hsiu-Li Lin ◽  
Po-Hao Su
Keyword(s):  
Thin Film ◽  
Fuel Cell ◽  
Composite Membrane ◽  
Fiber Composite ◽  
Composite Membranes ◽  
Cell Performance ◽  
Membrane Electrode ◽  
Membrane Thickness ◽  
Fuel Cell Performance ◽  
Nano Fiber

The PBI (poly(benzimidazole)) nano-fiber thin film with thickness of 18–30 μm is prepared by electro-spinning from a 20 wt% PBI/DMAc (N, N′-dimethyl acetamide) solution. The PBI nano-fiber thin film is then treated with a glutaraldehyde liquid for 24h at room temperature to proceed chemical crosslink reaction. The crosslink PBI nano-fiber thin film is then immersed in Nafion solutions to prepare Nafion/PBI nano-fiber composite membranes (thickness 22–34 μm). The morphology of the composite membranes is observed using a scanning electron microscope (SEM). The mechanical properties, conductivity, and unit fuel cell performance of membrane electrode assembly (MEA) of the composite membrane are investigated and compared with those of Nafion-212 membrane (thickness ∼50 μm) and Nafion/porous PTFE (poly(tetrafluoro ethylene)) composite membrane (thickness ∼22 μm). We show the present composite membrane has a similar fuel cell performance to Nafion/PTFE and a better fuel cell performance than Du Pont Nafion-212.

scholarly journals Conductivity of composite membrane-based poly(ether-ether-ketone) sulfonated (SPEEK) nanofiber mats of varying thickness

RSC Advances ◽  
2016 ◽  
Vol 6 (62) ◽  
pp. 56986-56999 ◽  
Author(s):  
J. L. Reyes-Rodriguez ◽  
O. Solorza-Feria ◽  
A. García-Bernabé ◽  
E. Giménez ◽  
O. Sahuquillo ◽  
...  
Keyword(s):  
Composite Membrane ◽  
Composite Membranes ◽  
Polyvinyl Butyral ◽  
Varying Thickness ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone ◽  
Nanofiber Mats

Nanofiber mats of SPEEK70wt%–PVB30wt% (polyvinyl butyral)-based composite membranes were prepared by varying the electrospinning time in order to obtain mats with different thicknesses.

Facile Preparation of Well-Dispersed GO-SPEEK Composite Membranes by Electrospun for Fuel Cell Applications

2015 ◽  
Vol 1735 ◽  
Author(s):  
Xu Liu ◽  
Xiaoyu Meng ◽  
Chuanming Shi ◽  
Jiangbei Huo ◽  
Ziqing Cai ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Proton Conductivity ◽  
Composite Membrane ◽  
Composite Membranes ◽  
Proton Exchange ◽  
Electrospinning Technique ◽  
Fuel Cell Application ◽  
High Proton ◽  
Poly Ether Ether Ketone ◽  
Direct Methanol

ABSTRACTGraphene oxide (GO) is one of the most attractive inorganic nanofillers in proton exchange membranes (PEMs) for its large specific surface area and high proton conductivity. The proton conductivity of GO nanosheet is known to be orders of magnitude greater than the bulk GO, thus it is essential to improve the dispersion of GO nanosheets in the PEM matrix to achieve higher conductivity. In this study, we report a facile and effective method to fabricate a GO/sulfonated poly ether ether ketone (SPEEK) composite membrane with well-dispersed GO nanosheets in SPEEK matrix by using electrospinning technique for direct methanol fuel cell application. The composite membrane exhibits improved proton conductivity, dimensional stability and methanol barrier property due to the presence of well-dispersed GOs. It is believed that the GO nanosheets can not only induce continuous channels for proton-conducting via Grotthuss mechanism, but also act as methanol barriers to hinder the methanol molecules from passing through the membrane.

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