Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, People's Republic of China.
Nanotechnology. 2011 Sep 30;22(39):395401. doi: 10.1088/0957-4484/22/39/395401. Epub 2011 Sep 2.
Pt-Sn alloy nanoparticles were conveniently immobilized on nitrogen-doped carbon nanotubes (NCNTs) through microwave-assisted ethylene glycol reduction. The nanoparticles have a narrow particle size distribution with the average particle size around 3 nm as measured by transmission electron microscopy and x-ray diffraction. The binding energy of metallic Sn passively shifts due to the charge transfer from Sn to Pt, as revealed by x-ray photoelectron spectroscopy. In comparison with the commercial Pt/C catalyst, Pt/NCNT presents a clear increase in activity for alcohol electro-oxidation due to the improved support, while the bimetallic Pt-Sn/NCNT has even higher activity owing to the alloying of Pt with Sn. Both Pt-Sn/NCNT and Pt/NCNT catalysts exhibit competitive long-term stability to Pt/C catalyst. The low cost, simple preparation and superior electrocatalytic performance indicate the great potential of Pt-Sn/NCNT in direct alcohol fuel cells.
通过微波辅助乙二醇还原，方便地将 Pt-Sn 合金纳米粒子固定在氮掺杂碳纳米管（NCNT）上。通过透射电子显微镜和 X 射线衍射测量，纳米粒子具有窄的粒径分布，平均粒径约为 3nm。X 射线光电子能谱表明，由于 Sn 向 Pt 的电荷转移，金属 Sn 的结合能被动移位。与商业 Pt/C 催化剂相比，由于载体的改善，Pt/NCNT 对醇电氧化的活性明显提高，而由于 Pt 与 Sn 的合金化，双金属 Pt-Sn/NCNT 具有更高的活性。Pt-Sn/NCNT 和 Pt/NCNT 催化剂都表现出比 Pt/C 催化剂更高的长期稳定性。低的成本，简单的制备和优越的电催化性能表明 Pt-Sn/NCNT 在直接醇燃料电池中有很大的应用潜力。
