| Mcore-Ptshell(M=Fe、Co、Ni)纳米粒子电催化氧还原的对比研究 |
| Performance of Oxygen Electrocatalytic Reduction on M-Pt(M=Fe, Co, Ni) Nanocatalyst |
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| 摘要: 纳米Pt具有较高的氧还原催化活性，但抗甲醇性不足，对直接甲醇燃料电池的性能产生影响。本文采用胶体模板法制备Mcore-Ptshell(M=Fe、Co、Ni)核壳型纳米粒子，用XRD和TEM表征纳米粒子的微观形貌和结构，动电位法和交流阻抗考察电催化活性和抗甲醇性。结果显示，Mcore-Ptshell纳米粒子的平均粒径约为10 nm，壳层厚度约为2~3 nm，3种催化材料的氧还原活性均高于碳载纳米Pt，抗甲醇性也有明显提高，其中Fecore,1-Ptshell,1/C的活性最高，峰电流密度达到0.583 3 mA·cm-2，Cocore,1-Ptshell,1/C次之，Nicore,1-Ptshell,1/C最低；Fecore,1-Ptshell,1/C与Nicore,1-Ptshell,1/C的抗甲醇性相当，略好于Cocore,1-Ptshell,1/C。 |
| 关键词: Mcore-Ptshell/C 电催化 氧还原 活性 抗甲醇性 |
| 基金项目: |
| Abstract: Pt-nanoparticles have high performance for oxygen reduction reaction, but lower methanol-resistance which influences the capability of DMFC. The Mcore-Ptshell(M=Fe, Co, Ni) nanoparticles were prepared by redox-transmetalation method, and characterized by TEM, XPS and XRD. The catalytic activity and methanol-resistance of electro-catalysts were measured by potentiodynamic and AC impedance. The results show that the mean particle size of Mcore-Ptshell were about 10 nm of diameter with 2~3 nm of shell thickness. The catalytic activity of Mcore,1-Ptshell,1 for ORR was markedly enhanced in comparison with Pt-nanoparticles supported on carbon-black, and the activities order of Mcore-Ptshell is Fecore,1-Ptshell,1>Cocore,1-Ptshell,1>Nicore,1-Ptshell,1. The peak current density of Fecore,1-Ptshell,1/C reached 0.583 3 mA·cm-2 in 0.5 mol·L-1 H2SO4+1.0 mol·L-1 CH3OH solution. The methanol-resistance of Fecore,1-Ptshell,1/C was similar with that of Nicore,1-Ptshell,1, and better than that of Cocore,1-Ptshell,1. |
| Keywords: Mcore-Ptshell/C electro-catalytic oxygen reduction activity methanol-resistance |
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| 张忠林,员娟宁,孙彦平,刘世斌,段东红,郝晓刚.Mcore-Ptshell(M=Fe、Co、Ni)纳米粒子电催化氧还原的对比研究[J].无机化学学报,2011,27(12):2413-2418. |
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