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Pt2+-Exchanged ZIF-8 nanocube as a solid-state precursor for L1(0)-PtZn intermetallic nanoparticles embedded in a hollow carbon nanocage

Authors
Kwon, TaehyunLim, SunghyunJun, MinkiKang, MinjungJoo, JinwhanOh, AramBaik, HionsuckHong, Chang SeopLee, Kwangyeol
Issue Date
14-1월-2020
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v.12, no.2, pp.1118 - 1127
Indexed
SCIE
SCOPUS
Journal Title
NANOSCALE
Volume
12
Number
2
Start Page
1118
End Page
1127
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/58309
DOI
10.1039/c9nr09318d
ISSN
2040-3364
Abstract
Nanoparticles with an atomically ordered alloy phase have received enormous attention for application as catalysts in fuel cells because of their unique electronic properties resulting from unusually strong d-orbital interactions between two metal components. However, the synthesis of intermetallic nanoparticles requires a high reaction temperature, thus necessitating the protection of nanoparticles with inorganic layers to prevent aggregation of nanoparticles during synthesis. The protective layer needs to be removed later for application as a catalyst, which is a cumbersome process. Herein, a novel synthetic strategy is reported for the preparation of L1(0)-PtZn intermetallic nanoparticles by utilizing Pt2+-exchanged ZIF-8 nanocubes as a solid-state precursor. The Pt2+-exchanged ZIF-8 phase plays a dual role as a metal ion source for L1(0)-PtZn nanoparticles and as a carbonaceous matrix that restrains the aggregation of nanoparticles during thermal treatment. The L1(0)-PtZn nanoparticles embedded in a hollow carbon nanocage obtained from one-step annealing of Pt2+-exchanged ZIF-8 showed better electrocatalytic activity and durability toward methanol oxidation under acidic electrolyte conditions than those obtained from commercial Pt/C catalysts.
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