Space Resolved, in Operando X-ray Absorption Spectroscopy: Investigations on Both the Anode and Cathode in a Direct Methanol Fuel Cell

2012 ◽  
Vol 116 (13) ◽  
pp. 7587-7595 ◽  
Author(s):  
Ditty Dixon ◽  
Anja Habereder ◽  
Maryam Farmand ◽  
Sebastian Kaserer ◽  
Christina Roth ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Absorption Spectroscopy ◽  
Direct Methanol Fuel Cell ◽  
X Ray ◽  
Direct Methanol ◽  
In Operando ◽  
X Ray Absorption ◽  
Methanol Fuel Cell

Water Evolution in Direct Methanol Fuel Cell Cathodes Studied by Synchrotron X-Ray Radiography

Fuel Cells ◽  
2013 ◽  
Vol 13 (3) ◽  
pp. 371-379 ◽  
Author(s):  
A. Schröder ◽  
K. Wippermann ◽  
T. Arlt ◽  
T. Sanders ◽  
T. Baumhöfer ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Direct Methanol Fuel Cell ◽  
X Ray ◽  
Fuel Cell Cathodes ◽  
Direct Methanol ◽  
Cell Cathodes ◽  
Methanol Fuel Cell

Synthesis and Characterization of PdCoNi Nanocomposites Supported on Graphene as Anodic Electrocatalysts for Methanol Oxidation in Direct Methanol Fuel Cell

2015 ◽  
Vol 658 ◽  
pp. 190-194 ◽  
Author(s):  
Siriporn Meeying ◽  
Pinsuda Viravathana ◽  
Atchana Wongchaisuwat ◽  
Siree Tangbunsuk
Keyword(s):  
Fuel Cell ◽  
Methanol Oxidation ◽  
Photoelectron Spectroscopy ◽  
Direct Methanol Fuel Cell ◽  
Chemical Reduction ◽  
Electrochemical Analysis ◽  
Xps Spectra ◽  
X Ray ◽  
Direct Methanol ◽  
Methanol Fuel Cell

PdCoNi nanocomposites supported on graphene (PdCoNi/G) have been obtained from chemical reduction of metal catalysts and graphite oxide (GO) with a strong reducing agent, followed by calcination at high temperature under N2 condition, and used for electrooxidation of methanol in direct methanol fuel cell. The morphologies and structural properties of electrocatalysts were examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD). X-ray spectroscopy techniques (X-ray photoelectron spectroscopy XPS) was used to investigate the chemical state of the synthesized catalysts. The results of Pd XPS spectra showed the metallic Pd and PdO phases for precalcined and calcined PdCoNi/G nanocomposite, respectively. The X-ray measurement of Co and Ni displayed the various metallic oxides in synthesized electrocatalysts. For electrochemical analysis, cyclic voltammetry (CV) and chronoamperometry (CA) indicated that the PdCoNi/G nanocomposites enhanced the methanol oxidation, compared to the lower activity in the calcined electrocatalysts.

Effects of Solvent and Concentration of Borohydride for the Preparation of PtRu/C Electrocatalysts for Direct Methanol Fuel Cell Anodes - A Factorial Design Study

2016 ◽  
Vol 869 ◽  
pp. 992-997
Author(s):  
Nataly Soares de Oliveira Polanco ◽  
Marcelo Marques Tusi ◽  
Michele Brandalise ◽  
Almir Oliveira Neto ◽  
Estevam Vitorio Spinacé
Keyword(s):  
Fuel Cell ◽  
Factorial Design ◽  
Direct Methanol Fuel Cell ◽  
Isopropyl Alcohol ◽  
Molar Ratio ◽  
Maximum Power Density ◽  
X Ray ◽  
Water As Solvent ◽  
Direct Methanol ◽  
Methanol Fuel Cell

A factorial design study was performed to evaluate the influence of the BH4-:PtRu molar ratio (5 and 15) and the solvent (water or isopropyl alcohol) in the preparation of PtRu/C electrocatalysts for Direct Methanol Fuel Cell (DMFC) anodes. The obtained materials were characterized by Energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and transmission electron microscopy (TEM). For both solvents increasing the BH4-:PtRu molar ratio from 5 to 15 leads to a decrease of the mean nanoparticle sizes and, using water as solvent, it was observed better distributions of the nanoparticles on the carbon support than using isopropyl alcohol. The DMFC maximum power density was obtained using a electrocatalyst prepared with a BH4-:PtRu molar ratio of 15 and water as solvent. The analysis of the effect of interaction of the two parameters showed that the variations of the maximum power density was more dependent of the BH4-:PtRu molar ratio than of the solvent used.

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