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Title: Organic-inorganic hybrid PtCo nanoparticle with high electrocatalytic activity and durability for oxygen reduction
Authors: Jung, Namgee
Bhattacharjee, Satadeep
Gautam, Sanjeev
Park, Hee-Young
Ryu, Jaeyune
Chung, Young-Hoon
Lee, Sang-Young
Jang, Injoon
Jang, Jong Hyun
Park, Sae Hum
Chung, Dong Young
Sung, Yung-Eun
Chae, Keun-Hwa
Waghmare, Umesh V.
Lee, Seung-Cheol
Yoo, Sung Jong
Keywords: Materials Science
Carbon-Supported Platinum
Mixed-Ligand Complexes
Fuel-Cell Catalysts
Ptxni1-X Nanoparticles
Alloy Nanoparticles
Skin Surfaces
Pt3Co Alloy
Issue Date: 2016
Publisher: Nature Publishing Group
Citation: Jung, N.; Bhattacharjee, S.; Gautam, S.; Park, H. Y.; Ryu, J.; Chung, Y. H.; Lee, S. Y.; Jang, I.; Jang, J. H.; Park, S. H.; Chung, D. Y.; Sung, Y. E.; Chae, K. H.; Waghmare, U. V.; Lee, S. C.; Yoo, S. J., Organic-inorganic hybrid PtCo nanoparticle with high electrocatalytic activity and durability for oxygen reduction. Npg Asia Materials 2016, 8, 10
NPG Asia Materials
Abstract: In Pt-transition metal (TM) alloy catalysts, the electron transfer from the TM to Pt is retarded owing to the inevitable oxidation of the TM surface by oxygen. In addition, acidic electrolytes such as those employed in fuel cells accelerate the dissolution of the surface TM oxide, which leads to catalyst degradation. Herein, we propose a novel synthesis strategy that selectively modifies the electronic structure of surface Co atoms with N-containing polymers, resulting in highly active and durable PtCo nanoparticle catalysts useful for the oxygen reduction reaction (ORR). The polymer, which is functionalized on carbon black, selectively interacts with the Co precursor, resulting in Co-N bond formation on the PtCo nanoparticle surface. Electron transfer from Co to Pt in the PtCo nanoparticles modified by the polymer is enhanced by the increase in the difference in electronegativity between Pt and Co compared with that in bare PtCo nanoparticles with the TM surface oxides. In addition, the dissolution of Co and Pt is prevented by the selective passivation of surface Co atoms and the decrease in the O-binding energy of surface Pt atoms. As a result, the catalytic activity and durability of PtCo nanoparticles for the ORR are significantly improved by the electronic ensemble effects. The proposed organic/inorganic hybrid concept will provide new insights into the tuning of nanomaterials consisting of heterogeneous metallic elements for various electrochemical and chemical applications.
Description: Open Access
ISSN: 1884-4049
Appears in Collections:Research Articles (Umesh V. Waghmare)

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