Graphene-supported Pt and PtPd nanorods with enhanced electrocatalytic performance for the oxygen reduction reaction

Abstract

The combinational modification of the morphology, alloying, and support for Pt catalysts has been optimized towards the oxygen reduction reaction. Graphene-supported PtPd nanorods have lower unfilled Pt d-states than carbon-supported Pt nanoparticles (Pt/C) and their specific and mass activities after the accelerated durability test are about 6.5 and 2.7 times higher than those of Pt/C, attributed to the synergistic electronic modification effect and graphene-metal interaction.

Tuning Nanowires and Nanotubes for Efficient Fuel‐Cell Electrocatalysis

“…Another way to further improve the ORR performance of Pt‐based NWs is replacing the commercial carbon black with graphene as a support. The graphene‐supported PtPd NRs (G‐PtPd), prepared by the formic acid reduction method, exhibited the specific activity and mass activity of 142 mA mg Pt −1 and 0.6 mA cm −2 in O 2 ‐saturated 0.5 m HClO 4 solution, much higher than graphene‐supported Pt NRs (G‐Pt), carbon‐supported PtPd NRs (C‐PtPd), carbon‐supported Pt NRs (C‐Pt) and the commercial Pt/C, due to the graphene support effect and Pd alloying effect lowering the unfilled Pt d band . Moreover, sulfur‐doped graphene supported Pt NWs (PNWs/SG) were also synthesized in a simple and facile solvothermal method .…”

Enhanced Oxygen Reduction and Methanol Oxidation Electrocatalysis over Bifunctional PtPdIr Mesoporous Hollow Nanospheres

“…[28][29][30][31][32][33][34][35] Besides the structure aspect, composition optimization of Pt-based catalysts could potentially tailor the electronic structure of Pt atoms and adjustt heir adsorption/desorption properties toward catalytic reactants and products, and thus enhancet he activity of reactive sites. [36][37][38][39] In this regard, av ariety of Pt-based tri-metallic or multi-metallic nanomaterials have been reported and demonstrated their enhanced catalytic performance for DMFCs. [40][41][42][43] Despite these advances, the facile fabrication of Pt-based multi-metallic hollow nanostructures with well-defined open pore surfaces is less reportedd ue to the daunting challengei nm ultiscale structural and compositional control.…”

Modification of TiO2 Nanotubes with PtRu/Graphene Nanocomposites for Enhanced Oxygen Reduction Reaction

“…[4] Though,w ide-spreadf uel cell commercialization has been hindered by seriousi ntermediate tolerance, species crossover,s luggishk inetics, poor stabilityi n the electrochemical environment, as well as the high cost and limited supply of Pt. [2,4,7] In addition, Pt dissolves under fuel cell operating conditions, [7] but although Pt catalysts possess some advantages for cathodef unctionality under very severe conditions at highly positive potentials, such as low pH, high temperature, oxygen atmosphere,a nd high humidity, it also suffers from severald isadvantages. [8][9][10] To furtheri mprovet heir catalytic efficiency and tolerance whiled ecreasing cost, many researchers have tried to developn ew techniques for the production of multicomponent Pt-incorporated catalysts.…”