Platinum Deposition on Carbon Nanotubes via Chemical Modification

Abstract

Carbon nanotubes can be functionalized by oxidation of HNO 3 or H 2 SO 4 -HNO 3 . The latter shows a higher capability in producing a high density of surface functional groups. These groups can act as specific nucleation sites for a well-dispersed deposition of Pt clusters on the surface of carbon nanotubes. These modified carbon nanotube materials were investigated by TEM, XPS, and DRIFT. A deposition mechanism is tentatively proposed and discussed.

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.…”

Clay Improved Dispersion of Carbon Nanotubes in Different Solvents

“…To overcome these problems different methods of functionalization are developed. Covalent functionalizations mainly tend to open the nanotubes by oxidative damage of their framework by strong acids [4], strong oxidants [5], ozone [6] or reactive plasma [7] and to subsequently generate oxygenated functional groups such as carboxyl, ketone, alcohol and ester groups, that serve to bound many different types of chemical moieties onto the ends and defect sites of the nanotubes. However, these methods have their drawbacks.…”

Carbon nanotubes as support for cathode catalyst of a direct methanol fuel cell

“…A number of studies relating to the synthesis suggest the possible applications of new carbon materials of CNT-supported catalysts and their application in as catalyst supports in the electrodes of fuel cells. heterogeneous catalysis have been reported [5][6][7][8][9]. Direct…”