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利用氮掺杂碳纳米笼(h NCNC)的高比表面积及掺杂氮原子的锚定作用,方便地将约3 nm的Pt-Ru合金纳米粒子均匀地负载在h NCNC表面,制得了Pt和Ru比例可调的Pt-Ru/h NCNC双金属合金催化剂.这些催化剂展现出优异的甲醇催化氧化活性和稳定性,且具有良好的抗CO中毒能力,显著优于Pt/h NCNC和商业Pt Ru/C等对照组催化剂.其优异的电化学性能可归因于以下因素的协同作用:(1)Pt-Ru合金的双功能机制增强了催化剂的CO氧化脱附能力从而使活性位重新暴露,(2)h NCNC的氮掺杂及高比表面积有利于获得粒径小且均匀的合金纳米粒子,(3)h NCNC的多尺度分级孔结构有利于甲醇等参与反应物质的传输.
Using the high specific surface area of nitrogen-doped carbon nanocagen (hNCNC) and the anchoring effect of nitrogen-doped atoms, Pt-Ru nanoparticles with an average size of about 3 nm can be uniformly supported on the surface of h NCNC. Pt and Ru ratio adjustable Pt-Ru / hNCNC bimetallic alloy catalyst.These catalysts showed excellent catalytic activity of methanol oxidation and stability, and has good resistance to CO poisoning, significantly better than the Pt / h NCNC and commercial Pt Ru / C, etc. The excellent electrochemical performance can be attributed to the synergistic effect of the following factors: (1) The bifunctional mechanism of Pt-Ru alloy enhances the catalytic CO oxidative desorption ability so that the active sites can be re-exposed, (2) h NCNC nitrogen doping and high specific surface area is conducive to obtaining small and uniform alloy nanoparticles, (3) hNCNC multiscale hierarchical pore structure is conducive to the participation of methanol and other reactive substances.