Electro-deposition on carbon black and carbon nanotubes of Pt nanostructured catalysts for methanol oxidation

Effect of ethylene glycol on electrochemical and morphological features of platinum electrodeposits from chloroplatinic acid

“…3 [2], where t on is the pulse length and t off is the time between two pulses and t tot is the total deposition time. The scheme for pulse electrodeposition is shown in Fig.…”

“…For the application of such coatings, the supports used were usually metallic and nonmetallic materials which are characterized by very high degree of adhesion for the coating of the metallic deposits [1]. Recently, significant interest has been raised in utilizing electrodeposition for the formation of an array of metal nanoparticles on the surface of different carbon supports [2,3]. The reason for this particular interest is to obtain M/C materials with maximum electrochemically active surface area, which requires formation of the electrodeposits not only on the surface but also in the pores of the carbon support.…”

“…It is known [2,9,15] that the support material can significantly influence the properties of prepared electrocatalysts, for instance, the size of metal particles, their stability, size distribution of the particles, etc. It has been found that the optimal dispersion pattern and Pt particle size can be obtained using an appropriate preparative procedure on an ideal supporting material.…”

“…However, this method requires a high amount of Pt to achieve good results. Besides, the control of particle size and size distribution by this simplest method is rather limited [2,7,25]. Chemical reduction method using reducing agents at lower temperature is also commonly used for preparation of the metallic supported catalysts [8,9,26].…”

Pt electrodeposited over carbon nano-networks grown on carbon paper as durable catalyst for PEM fuel cells

“…Secondly, ED mostly happens on the outer surface of the carbon support, due to its hydrophobicity, thereby improving contact with the proton exchange membrane when the PEMFC is assembled [13]. This also allows lowering Pt content in the fuel cell electrode (<0.1 mg cm −2 ) [14], due to its high utilization and avoiding Pt losses in the depth of the catalyst layer as normally happens with conventional electrode preparation methods, such as pasting and spraying [14]. At the same time, the hydrophobicity of the carbon support also often leads to poor contact with the electro-plating solution, and the resulting loading of Pt NPs on the support is often low with poor spatial distribution [15].…”