Highly active Pt decorated Pd/C nanocatalysts for oxygen reduction reaction. (21st September 2017)

• Record Type: Journal Article
• Authors: Liao, Mengyin; Li, Weiping; Xi, Xiping; Luo, Chenglong; Fu, Yinxuan; Gui, Shuanglin; Mai, Zhaohuan; Yan, Heng; Jiang, Cheng
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 38(2017)
• Page Start: 24090
• Page End: 24098
• Publication Date: 2017-09-21
• Subjects: Fuel cells -- Platinum -- Displacement reaction -- Oxygen reduction reaction -- Decorated catalyst; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.08.003
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: This article describes findings of the correlation between the atomic scale surface structure and the electrocatalytic performance of nanoengineered Pt-Pd/C catalysts for oxygen reduction reaction (ORR), aiming at providing a new fundamental insight into the role of the detailed atomic decorated structure of the catalysts in fuel cell reactions. Carbon-supported Pt decorated Pd nanoparticles (donated as Pt-Pd/C), with Pt coverage close to a monolayer, were prepared from a simple galvanic replacement reaction between Pd/C particles and PtCl4 2− at room temperature. The decorated architecture was confirmed by extensive microstructural characterization techniques, including TEM, XRD, XPS, HAADF-STEM, ICP and HS-LEIS. The catalysts were also examined for their intrinsic kinetic activities towards oxygen reduction reaction. The results have shown that the Pt-Pd/C catalysts are highly active towards molecular oxygen electrocatalytic reduction. These findings have profound implications to the design and nanoengineering of decorated surfaces of catalysts for oxygen reduction reaction. Highlights: The Pt decorated Pd/C catalyst with controllable size (5–6 nm) was successfully synthesized via the galvanic displacement. The Pt–Pd/C (Pt:Pd=1:100) catalyst have an unprecedented higher catalytic activity than Pt/C (J–M, 20 wt%). The decorated structure can significantly reduce the Pt loading and thus the cost.