Electrodeposited platinum catalysts over hierarchical carbon monolithic support

Abstract

Mesoporous deposits of platinum catalysts were electrodeposited over monolith carbon with hierarchical porous structure. The liquid crystal used as a template allowed the electrodeposition of the catalyst on the outer region of the carbon with low penetration in the porous structure. The platinum hexagonal mesostructured deposits exhibits an excellent stability enhanced by the roughness of the carbon support. The mass activity for the electrooxidation of methanol of the mesoporous Pt catalyst supported on the hierarchical carbon is similar to that observed on gold and to that reported for commercial Pt nanoparticulated catalysts, even when this catalyst has a smaller Pt load than the commercial one. Also, the poisoning rate of the mesoporous catalyst is lower than that observed for the commercial catalyst. The integrated system of structured materials could be suitable for the fabrication of modified electrodes in small scale applications.

Deposition of Pt nanoparticles on different carbonaceous materials by using different preparation methods for PEMFC electrocatalysts

“…Other fact to take into account in the MC with VC and NT is the presence of moderate amounts of functional groups only on the MC, which could favor the metalesupport interaction, thus leading to higher metallic dispersions and hence higher electrochemical performances [25,36]. Moreover, the porosity provides good physical anchoring sites for the deposited catalyst layer [37].…”

Electrochemical Characterization of PtRu Nanoparticles Supported on Mesoporous Carbon for Methanol Electrooxidation

“…10,27 Moreover, the inherent surface microporosity provides good physical anchoring sites for the deposited catalyst layer. 28 There are several methods to obtain structured carbon. 29À31 One of the most used is by replication of inorganic template, which produces carbon particles with small size and narrow mesopore distribution (<15 nm).…”

Electrodeposited mesoporous platinum catalysts over hierarchical carbon monolithic support as anode in small PEM fuel cells

“…Therefore, fuel cells performance could be improved beyond the intrinsic properties of the used materials by a suitable design and integration of the different components of the device. Thereby, structured materials with tailored properties are being proposed [9]. Over the past two decades, several routes to control those materials properties have arisen [10].…”

“…We have recently proposed the use of monolithic carbon with hierarchical pore size distribution as gas diffusion layer [9] in PEM fuel cells. The hierarchical monolithic carbon is formed by porous nanometer size spheres (whose packing generates mesopores), and straight capillaries crossing the bulk material.…”