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Strained Pt(221) Facet in a PtCo@Pt-Rich Catalyst Boosts Oxygen Reduction and Hydrogen Evolution Activity

Authors
Tetteh, Emmanuel BatsaGyan-Barimah, CalebLee, Ha-YoungKang, Tong-HyunKang, SeonghyeonRinge, StefanYu, Jong-Sung
Issue Date
8-6월-2022
Publisher
AMER CHEMICAL SOC
Keywords
intermetallic; nanowire; PEMFC; high-index facets; HER; density functional theory
Citation
ACS APPLIED MATERIALS & INTERFACES, v.14, no.22, pp.25246 - 25256
Indexed
SCIE
SCOPUS
Journal Title
ACS APPLIED MATERIALS & INTERFACES
Volume
14
Number
22
Start Page
25246
End Page
25256
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/142967
DOI
10.1021/acsami.2c00398
ISSN
1944-8244
Abstract
Over the last years, the development of highly active and durable Pt-based electrocatalysts has been identified as the main target for a large-scale industrial application of fuel cells. In this work, we make a significant step ahead in this direction by preparing a high-performance electrocatalyst and suggesting new structure-activity design concepts which could shape the future of oxygen reduction reaction (ORR) catalyst design. For this, we present a new one-dimensional nanowire catalyst consisting of a L1(0) ordered intermetallic PtCo alloy core and compressively strained high-index facets in the Pt-rich shell. We find the nanoscale PtCo catalyst to provide an excellent turnover for the ORR and hydrogen evolution reaction (HER), which we explain from high-resolution transmission electron microscopy and density functional theory calculations to be due to the high ratio of Pt(221) facets. These facets include highly active ORR and HER sites surprisingly on the terraces which are activated by a combination of sub-surface Co-induced high Miller index-related strain and oxygen coverage on the step sites. The low dimensionality of the catalyst provides a cost-efficient use of Pt. In addition, the high catalytic activity and durability are found during both half-cell and proton exchange membrane fuel cell (PEMFC) operations for both ORR and HER. We believe the revealed design concepts for generating active sites on the Pt-based catalyst can open up a new pathway toward the development of high-performance cathode catalysts for PEMFCs and other catalytic systems.
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