| Fecore-Ptshell/C核壳型纳米催化剂电催化还原氧的性能 |
| Performance of Fecore-Ptshell/C for Electrocatalytic Reduction of Oxygen |
|
| 摘要: 应用两步化学还原法合成不同壳层厚度的Fecore-Ptshell纳米粒子，并用SEM、TEM、EDS和XRD手段对其进行物理表征，应用动电位、交流阻抗和循环伏安法进行氧还原电催化活性及抗甲醇性测试。结果表明，样品Fecore-Ptshell纳米颗粒粒径分布集中，其中Fecore,1-Ptshell,0.5平均值为50 nm，核芯直径约34 nm，壳层厚度约8 nm；与Pt/C相比，Fecore-Ptshell/C对氧还原的催化活性和抗甲醇性明显提高，Fe与Pt原子比为1:0.5的Fecore-Ptshell/C在0.5 mol·L-1 H2SO4中氧还原的最大峰电流密度可达到184.7 mA·mg-1，是相同反应条件下Pt/C电流密度的1.45倍，抗甲醇性显著提高。 |
| 关键词: Fecore-Ptshell/C 核壳型纳米粒子 氧电还原 抗甲醇性 |
| 基金项目: |
| Abstract: The Fecore-Ptshell nanoparticles with various shell thicknesses were prepared by two-step chemical reduction method, and characterized by SEM, TEM, EDS and XRD. The catalytic activity and methanol-resistance of electrocatalysts were measured by potentiodynamic, AC impedance and cyclic voltammetry. The results show that Fecore-Ptshell nanoparticles have narrow size distribution, the mean particle size of Fecore,1-Ptshell,0.5 is 50 nm, with an Fe core size of 34 nm, a complete Pt shell thickness of 8 nm. The electro-catalytic activity of Fecore-Ptshell/C for the oxygen reduction and the methanol resistance increase more than that of Pt/C. The highest peak current density of Fecore,1-Ptshell,0.5/C reaches 184.7 mA·mg-1 in the solution of 0.5 mol·L-1 H2SO4, which is 1.45 folds higher than that of Pt/C electrocatalyst, indicating dramatically improved methanol-resistance. |
| Keywords: Fecore-Ptshell/C core-shell nanoparticle oxygen electro-reduction methanol-resistant property |
| |
| 摘要点击次数: 1663 |
| 全文下载次数: 1996 |
| 刘世斌,员娟宁,张忠林,段东红,李一兵,郝晓刚.Fecore-Ptshell/C核壳型纳米催化剂电催化还原氧的性能[J].无机化学学报,2010,26(7):1171-1176. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
