scholarly journals Pt Electrocatalyst Prepared by Hydrothermal Reduction onto the Gas Diffusion Layer for High-Temperature Formic Acid and Ethanol Fuel PEMFC

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1246
Author(s):  
Rayane da Silva Cardoso ◽  
Bruna Sartório de Castro ◽  
Sophya de Andrade Dias ◽  
Maria Clara H. Clemente ◽  
Sílvia C. L. Dias ◽  
...  
Keyword(s):  
High Temperature ◽  
Ethylene Glycol ◽  
Formic Acid ◽  
Solid Electrolyte ◽  
Diffusion Layer ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
Reductive Atmosphere ◽  
Power Densities ◽  
Hydrothermal Reduction

An alternative method for the preparation of PEMFC electrodes is presented in this work based on the direct deposition of Pt particles onto the gas diffusion layer (Pt@GDL) by hydrothermal reduction of the H2PtCl6 precursor from formic acid, ethylene glycol, and ethanol reductive solutions. There is a successful anchorage of Pt particles via the formation of Pt crystal aggregates. The influence of the reducing agent concentration and temperature was studied to analyze their influence on the size, morphology, and distribution of the Pt particles on the gas GDL. The prepared Pt@GDL was tested for formic acid and ethanol high-temperature H3PO4-doped PEMFC. The Pt@GDL prepared in the formic acid reductive atmosphere presented the best performance associated with the formation of smaller Pt crystals and a more homogeneous dispersion of the Pt particles. For formic acid and ethanol-fed high-temperature PEMFC using a H3PO4-doped polybenzimidazole membrane as the solid electrolyte, maximum power densities of 0.025 and 0.007 W cm−2 were drawn at 200 °C, respectively.

scholarly journals Quantifying phosphoric acid in high-temperature polymer electrolyte fuel cell components by X-ray tomographic microscopy

2014 ◽  
Vol 21 (6) ◽  
pp. 1319-1326 ◽  
Author(s):  
S. H. Eberhardt ◽  
F. Marone ◽  
M. Stampanoni ◽  
F. N. Büchi ◽  
T. J. Schmidt
Keyword(s):  
High Temperature ◽  
Fuel Cell ◽  
Phosphoric Acid ◽  
Polymer Electrolyte ◽  
Diffusion Layer ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
X Ray ◽  
Wide Range ◽  
Cell Components

Synchrotron-based X-ray tomographic microscopy is investigated for imaging the local distribution and concentration of phosphoric acid in high-temperature polymer electrolyte fuel cells. Phosphoric acid fills the pores of the macro- and microporous fuel cell components. Its concentration in the fuel cell varies over a wide range (40–100 wt% H3PO4). This renders the quantification and concentration determination challenging. The problem is solved by using propagation-based phase contrast imaging and a referencing method. Fuel cell components with known acid concentrations were used to correlate greyscale values and acid concentrations. Thus calibration curves were established for the gas diffusion layer, catalyst layer and membrane in a non-operating fuel cell. The non-destructive imaging methodology was verified by comparing image-based values for acid content and concentration in the gas diffusion layer with those from chemical analysis.

scholarly journals A 3D Simulation of Single-Channel High-Temperature Polymer Exchange Membrane Fuel Cell Performances

2019 ◽  
Vol 9 (17) ◽  
pp. 3633 ◽  
Author(s):  
Mohammad Yaghoub Abdollahzadeh Jamalabadi ◽  
Milad Ghasemi ◽  
Rezvan Alamian ◽  
Ebrahim Afshari ◽  
Somchai Wongwises ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
High Temperature ◽  
Fuel Cell ◽  
Pressure Drop ◽  
Diffusion Layer ◽  
Single Channel ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
Operating Pressure ◽  
Exchange Membrane

The fuel cell is an electrochemical energy converter that directly converts the chemical energy of the fuel into electrical current and heat. The fuel cell has been able to identify itself as a source of clean energy over the past few decades. In order to achieve the durability and stability of fuel cells, many parameters should be considered and evaluated Therefore, in this study, a single-channel high-temperature polymer exchange membrane fuel cell (HT-PEMFC) has been numerically simulated in three-dimensional, isothermal and single-phase approach. The distribution of the hydrogen and oxygen concentrations, as well as water in the anode and cathode, are shown; then the effect of different parameters of the operating pressure, the gas diffusion layer porosity, the electrical conductivity of the gas diffusion layer, the ionic conductivity of the membrane and the membrane thickness are investigated and evaluated on the fuel cell performance. The results showed that the pressure drop in the cathode channel was higher than the anode channel, so that the pressure drop in the cathode channel was higher than 9 bars but, in the anode channel was equal to 2 bars. By examining the species concentration, it was observed that their concentration at the entrance was higher and at the output was reduced due to participation in the reaction and consumption. Also, with increasing the operating pressure, the electrical conductivity of the gas diffusion layer and ionic conduction of the membrane, the performance of the fuel cell is improved.

Computational Fluid Dynamics Study on the High Temperature Proton Exchange Membrane Fuel Cell

2014 ◽  
Vol 953-954 ◽  
pp. 939-948
Author(s):  
Shu Guo Qu ◽  
Jian Long Li
Keyword(s):  
High Temperature ◽  
Fuel Cell ◽  
Diffusion Layer ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
Cell Polarization ◽  
Proton Exchange ◽  
Electrochemical Kinetics ◽  
Experimental Result ◽  
Exchange Membrane

A two-dimensional non-isothermal steady state numerical model for high temperature polymer exchange membrane fuel cell based on Nafion212/SiO2composite membrane was developed. Finite element method was used to solve electrochemical kinetics coupled with multi-component transport, flow, charge balance and energy conservation. The model-predicted fuel cell polarization curve was compared with published experimental result and a good agreement was found. The distributions of species and temperature in the fuel cell were predicted and the effects of the operational pressure and the porosity of gas diffusion layer on the performance of high temperature polymer exchange membrane were evaluated. A temperature rise of 5.8K was deserved when the operational pressure was 2atm, cathode relative humidity 59% and current density 500mA cm-2. The increasing of the operational pressure and the porosity of gas diffusion layer were found to be beneficial to the fuel cell performance.

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