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나노물질 및 화학반응 연구단
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Water-Assisted Growth of Cobalt Oxide and Cobalt Hydroxide Overlayers on the Pt3Co(111) Surface

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Title
Water-Assisted Growth of Cobalt Oxide and Cobalt Hydroxide Overlayers on the Pt3Co(111) Surface
Author(s)
Jeongjin Kim; Won Hui Doh; Youngjae Kim; Ki-Jeong Kim; Jeong Young Park
Publication Date
2019-12
Journal
ACS APPLIED ENERGY MATERIALS, v.2, no.12, pp.8580 - 8586
Publisher
AMER CHEMICAL SOC
Abstract
© 2019 American Chemical Society.Bimetallic platinum-cobalt (Pt-Co) catalysts have highly enhanced performance for the oxygen reduction reaction (ORR), where this peculiar surface alloy structure contributes to efficient energy conversion processes. However, the detailed catalytic reaction steps and adsorbate-driven interactions on the surface morphology under practical operating conditions are still unclear. Here, we report the water-assisted surface reconstruction of the bimetallic Pt3Co(111) surface using near-ambient pressure scanning tunneling microscopy (NAP-STM) in a humid O2 environment. The segregated CoOx clusters are selectively transferred to the Co(II) oxide/hydroxide layer at 0.1 Torr of H2O/O2 gas mixture at elevated temperature. In contrast, this drastic phase transition is limited and dependent on the partial pressure of water because the nanoscale CoO islands are formed with 0.1 Torr of the N2/O2 gas mixture. Synchrotron radiation in-situ X-ray photoelectron spectroscopy measurements also support the water-assisted evolution of the Co(OH)2 species. These morphologic modulations not only explain the surface degradation process of the bimetallic Pt-Co catalysts but also indicate the active formation of CoOx/CoOOH intermediates during energy conversion
URI
https://pr.ibs.re.kr/handle/8788114/6722
ISSN
2574-0962
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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