Preparation and characterizations of highly dispersed carbon supported PdxPty/C catalysts by a modified citrate reduction method for formic acid electrooxidation

Highly active carbon supported palladium catalysts decorated by a trace amount of platinum by an in-situ galvanic displacement reaction for formic acid oxidation

“…The CO stripping peak potential for Pd/C was found to be at 0.68 V. Peak potentials at 0.68 V, 0.67 V, 0.65 V and 0.62 V were ascribed to Pt 1 @Pd 150 /C, Pt 1 @Pd 75 /C, Pt 1 @Pd 50 /C and Pt 1 @Pd 15 /C, respectively. The progressive decrease in CO stripping peak potential with correspondingly increased Pd amount is an indication of gradually increasing CO tolerance, which has been found in our previous work [21]. These results also confirmed the successful displacement of Pt and the CO tolerance trend agreed well with the results found in XPS analysis.…”

“…1a and b shows the TEM image of Pt 1 @Pd 15 /C with different magnifications (The TEM images of Pd/C and the other Pt 1 @Pd x /C catalysts should have no appreciable differences which could be understood from the preparative process). The addition of inorganic salt KNO 3 seemed to have improved dispersion [21]. Pt 1 @Pd 15 nanoparticles on carbon support were mainly displayed with an anisotropic shape, similar to those reported in the literature [17,24].…”

“…[21]. A 2.5 ml 0.1109 M PdCl 2 (11.8 mg ml À1 Pd) aqueous solution was mixed with 3.8 ml 0.1109 M Na 3 Cyt and 38 ml 0.1109 M KNO 3 solution in a 500-ml flat-bottom flask and the content amounted to 300 ml with deionized water.…”

“…Chen et al prepared Pt decorated PdAu/C nanocatalysts via a spontaneous displacement reaction in toluene and they found PtePdAu/C catalyst with Pt:Pd ¼ 1:100 exhibited enhanced activity [7]. In this work, we synthesized Pd/C catalysts by a modified citrate reduction method developed in our lab recently [21], then an in-situ galvanic displacement reaction between the as-prepared Pd/C ink and H 2 PtCl 6 produced Pt 1 @Pd x /C catalysts. This one-step preparative route in aqueous solution is simple and straightforward.…”

Graphene supported heterogeneous catalysts: An overview

“…Porous carbon materials consist of a very flexible set of supports for the preparation of heterogeneous catalyst [38,61]. Thus, its physical and chemical surface properties can easily be tailored to develop a large surface area to disperse the active phase [62,63]. It is believed that the proper pore size distribution brought about by carbon as the support material could facilitate the diffusion of reactants and products to and from the surface, which in consequence acquire an acidebase characteristic required to result in superior catalyst performance [64].…”