SHAPE-DEPENDENT ELECTROCATALYSIS: AMMONIA OXIDATION ON PLATINUM NANOPARTICLES WITH PREFERENTIAL (1 0 0) SURFACES
SHAPE-DEPENDENT ELECTROCATALYSIS: AMMONIA OXIDATION ON PLATINUM NANOPARTICLES WITH PREFERENTIAL (1 0 0) SURFACES
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DOI：
10.1016/j.elecom.2004.08.010
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发表时间：
2004-10
影响因子：
5.4
通讯作者：
F. Vidal-Iglesias;J. Solla-Gullón;P. Rodríguez;E. Herrero;V. Montiel;J. Feliu;A. Aldaz
中科院分区：
文献类型：
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作者：
F. Vidal-Iglesias;J. Solla-Gullón;P. Rodríguez;E. Herrero;V. Montiel;J. Feliu;A. Aldaz
报道了氨氧化反应的形状依赖性电催化。合成了具有不同（100）优先取向表面结构的Pt纳米颗粒。提出了 Pt 纳米颗粒的循环伏安法，并将“所谓的”氢吸附/解吸过程用作结构敏感反应，以获得有关纳米颗粒表面结构的定性信息。虽然微乳液中制备的 Pt 纳米颗粒显示出与多取向表面的特性非常相似的伏安曲线，但胶体 Pt 纳米颗粒似乎是 (100) 优先取向的。研究了这些纳米粒子在碱性介质中氧化氨的电化学活性。结果表明，阳极电流密度对Pt(100)域的存在非常敏感。因此，不同纳米颗粒之间可以获得高七倍的氧化电流密度，这表明控制纳米颗粒的表面结构对于开发氨氧化活性电催化剂的重要性。
A shape-dependent electrocatalysis for the ammonia oxidation reaction is reported. Pt nanoparticles with different (100) preferentially oriented surface structures were synthesised. Cyclic voltammetry of the Pt nanoparticles is presented and the “so-called” hydrogen adsorption/desorption process is used as structure sensitive reaction to obtain qualitative information about the surface structure of the nanoparticles. While Pt nanoparticles prepared in microemulsion show a voltammetric profile very similar to that characteristic of a polyoriented surface, colloidal Pt nanoparticles appear to be (100) preferentially oriented. The electrochemical activity of these nanoparticles for ammonia oxidation in basic medium was studied. The results show that the anodic current density is very sensitive to the existence of Pt(100) domains. Thus oxidation current densities seven times higher can be obtained among the different nanoparticles, showing the importance of controlling the surface structure of the nanoparticles for the development of an active electrocatalyst for ammonia oxidation.