High utilization platinum deposition on single-walled carbon nanotubes as catalysts for direct methanol fuel cell

Direct synthesis of graphitic carbon nanostructures from saccharides and their use as electrocatalytic supports

“…However, it should be pointed out that the catalytic activities achieved with the Pt/GCNs are higher than the values reported in the literature for electrocatalysts made up of Pt supported on other forms of graphitic carbon, such as multiwalled carbon nanotubes [31,32]. On the other hand, no functionalization of the supports (contrary to what normally happens with carbon nanotubes [32][33][34][35][36]) has been necessary to achieved good dispersions of Pt nanoparticles.…”

Reversible Attachment of Platinum Alloy Nanoparticles to Nonfunctionalized Carbon Nanotubes

“…Composites of metallic nanoparticles (NPs) and carbon nanotubes (CNTs) exhibit high catalytic activity for various chemical reactions [1][2][3][4][5][6] and have also been explored for hydrogen storage applications [7]. Recent reports include platinum [6,8,9], cobalt [10,11], nickel [7,12], gold [13], rhodium [14] as well as platinum nickel [15], platinum tin [16] and platinum ruthenium [17] NPs immobilized on CNTs [18].…”

“…In order to better understand the interaction between the directly attached nanoparticles and the non-functionalized carbon nanotubes we employed first-principles calculations on model systems of small Pt clusters and both zig-zag and armchair singlewall carbon nanotubes. The detailed comprehension of such systems is of major importance since they find applications in catalysis and energy storage.Composites of metallic nanoparticles (NPs) and carbon nanotubes (CNTs) exhibit high catalytic activity for various chemical reactions [1][2][3][4][5][6] and have also been explored for hydrogen storage applications [7]. Recent reports include platinum [6,8,9] [19,20] and catalytic properties [21][22][23].…”

PtCo alloy nanoparticles supported on graphene nanosheets with high performance for methanol oxidation

“…Furthermore, XPS studies also show that there are different Pt or Co oxidation states in the catalyst. As can be seen from Figure 3(c), the Pt 4f signal of PtCo/G consists of two pairs of doublets: the most intense doublet (71.6 and 74.9 eV) corresponds to metallic Pt; the second set of doublets (72.2 and 76.2 eV) can be assigned to the +2 oxidation state of Pt [12,51]. It is clearly seen that the Pt 4f core-levels for PtCo/G are shifted to higher binding energies with respect to pure Pt, which can be ascribed to the 5d electron loss in Pt-based alloy systems [52].…”

“…Metallic platinum is a singlecomponent catalyst that shows a significant activity for methanol oxidation [9]. However, the pure Pt system may be easily poisoned by CO and the high cost limits its application as electrocatalyst in commercial field [10][11][12]. To overcome these problems, several studies have been carried out to design and synthesize Pt-based alloy electrocatalysts resulting in a better electrocatalytic performance and a lowered Pt content [13][14][15].…”