Molybdenum-Doped PdPt@Pt Core–Shell Octahedra Supported by Ionic Block Copolymer-Functionalized Graphene as a Highly Active and Durable Oxygen Reduction Electrocatalyst

• DOI: 10.1021/acsami.6b13299
• Publication Date: 2016-12-19T11:55:14Z
• Authors: Kie Yong Cho; Yong Sik Yeom; Heun Young Seo; Pradip Kumar; Albert S. Lee; Kyung-Youl Baek; Ho Gyu Yoon
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Development of highly active and durable electrocatalysts that can effectively electrocatalyze oxygen reduction reactions (ORR) still remains one important challenge for high-performance electrochemical conversion storage applications such as fuel cells metal-air batteries. Herein, we propose the combination molybdenum-doped PdPt@Pt core-shell octahedra pyrene-functionalized poly(dimethylaminoethyl methacrylate)-b-poly[(ethylene glycol) methyl ether methacrylate] ionic block copolymer-functionalized reduced graphene oxide (Mo-PdPt@Pt/IG) to augment interfacial cohesion both components using a tunable ex situ mixing strategy. The rationally designed Mo-PdPt@Pt have unique compositional benefits, including segregation Mo atoms on vertexes edges octahedron 2-3 shell layers Pt PdPt alloy core, which provide sites catalyst ORR along with enhanced stability. In addition, copolymer functionalized facilitate intermolecular charge transfer good stability metal NPs, arises from layer. When beneficial features IG are combined, Mo-PdPt@Pt/IG exhibits substantially activity durability relative those commercial Pt/C. Notably, shows mass 31-fold higher than Pt/C maintains high activities after 10 000 cycles intensive testing. current study highlights crucial strategies in designing Pt-based effective functional supports toward synergetic effects ORR.