Dendritic Pt shells coated on concave Pd nanocrystals: synthesis and use as electrocatalysts for acidic oxygen reduction reaction. (6th December 2018)

• Record Type: Journal Article
• Authors: Wu, Zheng-Wei; Chiang, Ming-Hung; Wang, Tzu-Pei; Lee, Chien-Liang
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 49(2018)
• Page Start: 22195
• Page End: 22204
• Publication Date: 2018-12-06
• Subjects: High-index facets -- Seed-growth method -- Core-shell -- Tafel plots -- Rotating ring disk electrode; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.10.114
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A simple method to prepare a dendritic Pt-shell coating on concave Pd nanoparticles (NPs) was successfully developed. In this study, tuning the Pt precursor concentration in the reaction mixture allowed control over the length of the outer Pt dendrites, enclosed by (211) high-index facets or (110) facets were performed. The concave Pd NPs covered by short Pt dendrites (Pd/S-Pt) and long Pt dendrites (Pd/L-Pt) were applied as catalysts for the oxygen reduction reaction (ORR) in 0.1 M HClO4 electrolyte solution. Pd/S-Pt with (211) facets had higher specific activity (0.106 mA cm −2 ) than that of Pd/L-Pt with (110) facets (0.066 mA cm −2 ) or commercial Pt/C (0.076 mA cm −2 ). Additionally, the accelerated durability test (ADT) results revealed that the decay for the ORR kinetic current catalysed by Pd/S-Pt was 28.21%, which was smaller than that of Pt/C (58.15%). Thus, Pd/S-Pt was effective for catalysis of the ORR. Graphical abstract: Highlights: Dendritic Pt-shells coating on concave Pd NPs are successfully prepared. Pt dendrites with short (Pd/S-Pt) or long chain length (Pd/L-Pt) are prepared. Pd/S-Pt shows high ORR current in a mixed control of activation-diffusion period. The specific activity of Pd/S-Pt is 1.39 times greater than that for Pt/C. ADT results show that the stability of Pd/S-Pt is superior to Pt/C.