A Platinum Monolayer Core-Shell Catalyst with a Ternary Alloy Nanoparticle Core and Enhanced Stability for the Oxygen Reduction Reaction

作者：Nan, Haoxiong; Tian, Xinlong; Yang, Lijun; Shu, Ting; Song, Huiyu; Liao, Shijun^*

来源：Journal of Nanomaterials, 2015, 2015: 715474.

DOI：10.1155/2015/715474

• Core shell catalysts
• Energy dispersive X-ray spectrometry
• Galvanic displacement
• Half-wave potential
• Oxygen reduction reaction
• Pt/C electrocatalysts
• Ternary nanoparticles
• Underpotential deposition

We synthesize a platinum monolayer core-shell catalyst with a ternary alloy nanoparticle core of Pd, Ir, and Ni. A Pt monolayer is deposited on carbon-supported PdIrNi nanoparticles using an underpotential deposition method, in which a copper monolayer is applied to the ternary nanoparticles; this is followed by the galvanic displacement of Cu with Pt to generate a Pt monolayer on the surface of the core. The core-shell Pd-1 Ir-1 Ni-2@\Pt/C catalyst exhibits excellent oxygen reduction reaction activity, yielding a mass activity significantly higher than that of Pt monolayer catalysts containing PdIr or PdNi nanoparticles as cores and four times higher than that of a commercial Pt/C electrocatalyst. In 0.1 M HClO4, the half-wave potential reaches 0.91 V, about 30 mV higher than that of Pt/C. We verify the structure and composition of the carbon-supported PdIrNi nanoparticles using X-ray powder diffraction, Xray photoelectron spectroscopy, thermogravimetry, transmission electron microscopy, and energy dispersive X-ray spectrometry, and we perform a stability test that confirms the excellent stability of our core-shell catalyst. We suggest that the porous structure resulting from the dissolution of Ni in the alloy nanoparticles may be the main reason for the catalyst's enhanced performance.

• 出版日期2015
• 单位华南理工大学