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首页> 外文期刊>Electrocatalysis >Platinum Monolayer on IrFe Core–Shell Nanoparticle Electrocatalysts for the Oxygen Reduction Reaction
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Platinum Monolayer on IrFe Core–Shell Nanoparticle Electrocatalysts for the Oxygen Reduction Reaction

机译：IrFe核壳纳米粒子电催化剂上的铂单层用于氧还原反应

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摘要

We synthesized high activity and stability platinum monolayer on IrFe core–shell nanoparticle electrocatalysts. Carbon-supported IrFe core–shell nanoparticles were synthesized by chemical reduction and subsequent thermal annealing. The formation of Ir shells on IrFe solid-solution alloy cores has been verified by scanning transmission electron microscopy coupled with energy-loss spectroscopy (EELS) and in situ X-ray absorption spectroscopy. The Pt monolayers were deposited on IrFe core-shell nanoparticles by galvanic replacement of underpotentially deposited Cu adatoms on the Ir shell surfaces. The specific and Pt mass activities for the ORR on the Pt monolayer on IrFe core-shell nanoparticle electrocatalyst are 0.46 mA/cm2 and 1.1 A/mgPt, which are much higher than those on a commercial Pt/C electrocatalyst. High durability of PtML/IrFe/C has also been demonstrated by potential cycling tests. These high activity and durability observed can be ascribed to the structural and electronic interaction between the Pt monolayer and the IrFe core–shell nanoparticles.
机译：我们在IrFe核壳纳米粒子电催化剂上合成了高活性和稳定性的铂单层。碳负载的IrFe核壳纳米粒子是通过化学还原和随后的热退火合成的。 IrFe固溶合金芯上Ir壳的形成已通过扫描透射电子显微镜，能量损失光谱（EELS）和原位X射线吸收光谱法进行了验证。通过电流置换Ir壳表面上欠电沉积的Cu原子，将Pt单层沉积在IrFe核壳纳米颗粒上。 IrFe核壳纳米粒子电催化剂上Pt单层的ORR的比活和Pt质量活度分别为0.46 mA / cm2 和1.1 A / mgPt ，远高于商业Pt / C电催化剂。潜在的循环测试也证明了PtML / IrFe / C的高耐久性。观察到的这些高活性和耐用性可以归因于Pt单层和IrFe核壳纳米粒子之间的结构和电子相互作用。

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