scholarly journals A Graphite Oxide Paper Polymer Electrolyte for Direct Methanol Fuel Cells

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Ravi Kumar ◽  
Mohamed Mamlouk ◽  
Keith Scott
Keyword(s):  
Graphite Oxide ◽  
Direct Methanol Fuel Cells ◽  
Directed Assembly ◽  
Membrane Electrode Assembly ◽  
Membrane Electrode ◽  
Free Standing ◽  
Direct Methanol ◽  
Graphene Oxide Paper ◽  
Methanol Fuel Cell

A flow directed assembly of graphite oxide solution was used in the formation of free-standing graphene oxide paper of approximate thickness of 100 μm. The GO papers were characterised by XRD and SEM. Electrochemical characterization of the GO paper membrane electrode assembly revealed proton conductivities of 4.1 × 10−2 S cm−1to 8.2 × 10−2 S cm−1at temperatures of 25–90°C. A direct methanol fuel cell, at 60°C, gave a peak power density of 8 mW cm−2at a current density of 35 mA cm−2.

Characterization of Electrode with Various of Pt-Ru/C Catalyst Loading and the Performance Test of Membrane Electrode Assembly (MEA) in Passive Direct Methanol Fuel Cell (DMFC)

2020 ◽  
Vol 840 ◽  
pp. 558-565
Author(s):  
Dwi Hawa Yulianti ◽  
Dedi Rohendi ◽  
Nirwan Syarif ◽  
Addy Rachmat
Keyword(s):  
Fuel Cell ◽  
Direct Methanol Fuel Cell ◽  
Performance Test ◽  
Membrane Electrode Assembly ◽  
Open Circuit ◽  
Catalyst Loading ◽  
Membrane Electrode ◽  
Direct Methanol ◽  
Methanol Fuel Cell

Membrane Electrode Assembly (MEA) is the most important component in fuel cell devices. Electrodes composing MEA greatly determine the performance and durability of its application in passive Direct Methanol Fuel Cell (DMFC). Fabrication and characterization of electrodes with various loading Pt-Ru/C catalysts and their application to DMFC have been carried out. The XRD characterization results indicate the presence of C atoms which are indicated by the appearance of peaks at angles 2θ = 25°-30°. In areas, 44.4° and 45.1° indicate the presence of Ru even with low intensity and platinum in the area of 54.67°, 39.86°, 54.736°, 39.88°, and 68.3°. The highest ECSA value and electrical conductivity and low resistance showed the best catalytic activity possessed by electrodes with the loading of Pt-Ru/C catalyst 10 mg/cm2. MEA with a catalyst loading of 8 mg/cm2 is known to have a fairly large initial voltage before the load is given based on the results of Open Circuit Voltage (OCV) measurements. The MEA performance was observed based on I-V and I-P performance tests using the SMART2 WonAtech Fuel Cell Test Station on passive DMFC stacks with 3 M methanol as fuel. The best MEA shown in MEA with catalyst loading is 10 mg/cm2 because it can maintain and achieve a voltage and power density that is quite higher than other MEAs in each load increase in the form of current density.

Critique and Improvement of a One-Dimensional Semianalytical Model of a Direct Methanol Fuel Cell

2012 ◽  
Vol 9 (5) ◽  
Author(s):  
C. C. Kuo ◽  
W. E. Lear ◽  
J. H. Fletcher ◽  
O. D. Crisalle
Keyword(s):  
Fuel Cell ◽  
Polarization Curve ◽  
Current Density ◽  
Direct Methanol Fuel Cell ◽  
Membrane Electrode Assembly ◽  
Membrane Electrode ◽  
One Dimensional ◽  
Implicit Equation ◽  
Direct Methanol ◽  
Methanol Fuel Cell

A constructive critique and a suite of proposed improvements for a recent one-dimensional semianalytical model of a direct methanol fuel cell are presented for the purpose of improving the predictive ability of the modeling approach. The model produces a polarization curve for a fuel cell system comprised of a single membrane-electrode assembly, based on a semianalytical one-dimensional solution of the steady-state methanol concentration profile across relevant layers of the membrane electrode assembly. The first improvement proposed is a more precise numerical solution method for an implicit equation that describes the overall current density, leading to better convergence properties. A second improvement is a new technique for identifying the maximum achievable current density, an important piece of information necessary to avoid divergence of the implicit-equation solver. Third, a modeling improvement is introduced through the adoption of a linear ion-conductivity model that enhances the ability to better match experimental polarization-curve data at high current densities. Fourth, a systematic method is advanced for extracting anodic and cathodic transfer-coefficient parameters from experimental data via a least-squares regression procedure, eliminating a potentially significant parameter estimation error. Finally, this study determines that the methanol concentration boundary condition imposed on the membrane side of the membrane-cathode interface plays a critical role in the model’s ability to predict the limiting current density. Furthermore, the study argues for the need to carry out additional experimental work to identify more meaningful boundary concentration values realized by the cell.

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