The Fabrication Of 3D Ordered Graphene Network Structured Noble Metal Catalysts And Their Higher Catalytic Activity

In this thesis, we focused on the fabrication of graphene/nano-sized noble metal composite catalysts and the study about the methanol oxidation catalytic activity of them. Based on heterocoagulation method, polystyrene/reduced graphene oxide (PS/rGO) composite particles were prepared as matrix, and through a polyol-reduction process, the noble metal nanoparticles (NMNPs) were successfully attached on the surface of the PS/rGO composite particles, obtaining PS/rGO@NMNPs composite particles, which were used as building blocks to fabricate 3D catalysts with double channels for both electrons and electrolyte through the in-situ self-deposition effect. The methanol oxidation catalytic activity of the composite catalysts were also studied.The main contents of this thesis cover the following two aspects:(1) Fabrication of graphene-based PS/rGO@PtNPs ternary composite catalysts and their catalytic activityBased on the heterocoagulation method, PS/rGO composite particles with different graphene contents were prepared as the matrix, and then through a polyol-reduction process, the platinum nanoparticles (PtNPs) were successfully attached on the rGO’s surface, obtaining PS/rGO@PtNPs ternary composite particles. We developed a facile, practical and environmental-friendly "Particle self-deposition construction" method for in-situ constructing graphene/NMNPs composite catalysts with 3D graphene network and meanwhile forming double connective channels for both electrons and electrolyte. Compared with the close stacked rGO/PtNPs catalyst, The fabricated 3D network-structured catalysts exhibited outstanding catalytic activity in the methanol oxidation reaction for fuel cells.(2) Fabrication of graphene-based PS/rGO@PtRuNPs ternary composite catalysts and their catalytic activityPS/rGO composite particles that were fully wrapped by rGO nanosheets were firstly prepared as the matrix based on the heterocoagulation method, and then through a polyol-reduction process, the platinum-ruthenium alloyed nanoparticles (PtRuNPs) were successfully attached on the rGO’s surface, obtaining PS/rGO@PtRuNPs ternary composite particles. Through the "Particle self-deposition construction" method, the rGO/PtRuNPs composite catalysts with double connective network channel structure were in-situ fabricated. In this chapter, we focused on the influence of Pt/Ru and graphene/noble metal mass ratio to the methanol oxidation catalytic activity of the PS/rGO@PtRuNPs composite catalysts, and thus we obtained the effective, economical PS/rGO@PtRuNPs alloyed composite catalyst.