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Organic-inorganic hybrid PtCo nanoparticle with high electrocatalytic activity and durability for oxygen reduction

Jung, Namgee and Bhattacharjee, Satadeep and Gautam, Sanjeev and Park, Hee-Young and Ryu, Jaeyune and Chung, Young-Hoon and Lee, Sang-Young and Jang, Injoon and Jang, Jong Hyun and Park, Sae Hum and Chung, Dong Young and Sung, Yung-Eun and Chae, Keun-Hwa and Waghmare, Umesh V and Lee, Seung-Cheol and Yoo, Sung Jong (2016) Organic-inorganic hybrid PtCo nanoparticle with high electrocatalytic activity and durability for oxygen reduction. In: NPG ASIA MATERIALS, 8 .

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Official URL: http://dx.doi.org/10.1038/am.2015.143


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.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the NATURE PUBLISHING GROUP, 75 VARICK ST, 9TH FLR, NEW YORK, NY 10013-1917 USA
Department/Centre: Division of Chemical Sciences > Organic Chemistry
Date Deposited: 17 Feb 2016 07:19
Last Modified: 23 Oct 2018 14:49
URI: http://eprints.iisc.ac.in/id/eprint/53283

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