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Wormholelike mesoporous carbons(WMCs) with three different pore diameters(D_p),namely WMC-F7(D_p=8.5nm),WMC-F30(D_p=4.4nm),and WMC-FO(D_p = 3.1nm) are prepared via a modified sol-gel process.Then PtRu nanoparticles with the particle size(d_(Pt)) of ~3.2 nm supported on WMCs are synthesized with a modified pulse microwave-assisted polyol method.It is found that the pore diameter of WMCs plays an important role in the electrochemical activity of PtRu toward alcohol electrooxidation reaction.PtRu/WMC-F7 with Dp > 2d_(Pt) exhibits the largest electrochemical surface area(ESA) and the highest activity toward methanol electrooxidation.With the decrease in D_p,PtRu/WMC-F30 and PtRu/WMC-FO have much lower ESA and electrochemical activity,especially for the isopropanol electrooxidation with a larger molecular size.When D_p is more than twice d_(Pt),the mass transfer of reactants and electrolyte are easier,and thus more PtRu nanoparticles can be utilized and the catalysts activity can be enhanced.
Wormholelike mesoporous carbons (WMCs) with three different pore diameters (D_p), namely WMC-F7 (D_p = 8.5nm), WMC-F30 (D_p = 4.4nm), and WMC-FO modified sol-gel process. PtRu nanoparticles with the particle size (d_ (Pt)) of ~ 3.2 nm supported on WMCs are synthesized with a modified pulse microwave-assisted polyol method. It is found that the pore diameter of WMCs plays an important role in the electrochemical activity of PtRu toward alcohol electrooxidation reaction. PtRu / WMC-F7 exhibits the largest electrochemical surface area (ESA) and the highest activity toward methanol electrooxidation. With the decrease in D_p, PtRu / WMC -F30 and PtRu / WMC-FO have much lower ESA and electrochemical activity, especially for the isopropanol electrooxidation with a larger molecular size. WH D_p is more than twice d_ (Pt), the mass transfer of reactants and electrolyte are easier, and thus more PtRu nanoparticles can be utilized and the catalysts activity can be enhance d.