Cho, Kie Yong Yeom, Yong Sik Seo, Heun Young Kumar, Pradip Lee, Albert S. Baek, Kyung-Youl Yoon, Ho Gyu 2024-01-20T02:31:16Z 2024-01-20T02:31:16Z 2021-09-05 2017-01-18 1944-8244 https://pubs.kist.re.kr/handle/201004/123186 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 and storage applications such as fuel cells and metal-air batteries. Herein, we propose the combination of molybdenum-doped PdPt@Pt core-shell octahedra and the pyrene-functionalized poly(dimethylaminoethyl methacrylate)-b-poly[(ethylene glycol) methyl ether methacrylate] ionic block copolymer-functionalized reduced graphene, oxide (Mo-PdPt@Pt/IG) to effectively augment the interfacial cohesion of both components using a tunable ex situ mixing strategy. The rationally designed Mo-PdPt@Pt core shell octahedra have unique compositional benefits, including segregation of Mo atoms on the vertexes and edges of the octahedron and 2-3 shell layers of Pt atoms on a PdPt alloy core, which can provide highly active sites to the catalyst for ORR. along with enhanced electrochemical stability. In addition, the ionic block copolymer functionalized graphene can facilitate intermolecular charge transfer and. good stability of metal NPs, which arises from the ionic block copolymer interfacial layer. When the beneficial features of the Mo-PdPt@Pt and IG are combined, the Mo-PdPt@Pt/IG exhibits substantially enhanced activity and durability for ORR. relative to those of commercial Pt/C. Notably, the Mo-PdPt@Pt/IG shows mass activity 31-fold higher than that of Pt/C and substantially maintains high activities after 10 000 cycles of intensive durability testing. The current study highlights the crucial strategies in designing the highly active and durable Pt-based octahedra and effective combination with functional graphene supports toward the synergetic effects on ORR. English American Chemical Society BY-LAYER DEPOSITION FUEL-CELLS ENHANCED ACTIVITY PLATINUM NANOPARTICLES CATALYSTS SHAPE PERFORMANCE NANOCRYSTALS DURABILITY Molybdenum-Doped PdPt@Pt Core-Shell Octahedra Supported by Ionic Block Copolymer-Functionalized Graphene as a Highly Active and Durable Oxygen Reduction Electrocatalyst Article 10.1021/acsami.6b13299 1 ACS Applied Materials & Interfaces, v.9, no.2, pp.1524 - 1535 ACS Applied Materials & Interfaces 9 2 1524 1535 scie scopus 000392458300039 2-s2.0-85013320260 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article BY-LAYER DEPOSITION FUEL-CELLS ENHANCED ACTIVITY PLATINUM NANOPARTICLES CATALYSTS SHAPE PERFORMANCE NANOCRYSTALS DURABILITY molybdenum doping multimetallic nanocrystals functionalized graphene octahedra core-shell structures electrocatalysts fuel cells