Janus Nanocages of Platinum-Group Metals and Their Use as Effective Dual-Electrocatalysts.
Janus nanocage
dual-electrocatalysts
oxygen evolution
oxygen reduction
platinum-group metals
Journal
Angewandte Chemie (International ed. in English)
ISSN: 1521-3773
Titre abrégé: Angew Chem Int Ed Engl
Pays: Germany
ID NLM: 0370543
Informations de publication
Date de publication:
26 Apr 2021
26 Apr 2021
Historique:
received:
14
02
2021
pubmed:
19
2
2021
medline:
19
2
2021
entrez:
18
2
2021
Statut:
ppublish
Résumé
Janus nanocages with distinctive platinum-group metals on the outer and inner surfaces can naturally catalyze at least two different reactions. Here we report a general method based on successive deposition and then selective etching for the facile synthesis of such nanocages. We have fabricated 11 different types of Janus nanocages characterized by a uniform size and well-defined {100} facets, together with porous, ultrathin, asymmetric walls up to 1.6 nm thick. When tested as dual-electrocatalysts toward oxygen reduction and evolution reactions, the Janus nanocages based on Pt and Ir exhibited superior activities depending on the thickness and relative position of the metal layer. Density functional theory studies suggest that the alloy composition and surface structure of the nanocages both play important roles in enhancing the electrocatalytic activities by modulating the stability of key reaction intermediates.
Identifiants
pubmed: 33600031
doi: 10.1002/anie.202102275
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
10384-10392Subventions
Organisme : Department of Energy, Office of Basic Energy Sciences, Catalysis Science Program
ID : DE-FG02-05ER15731
Informations de copyright
© 2021 Wiley-VCH GmbH.
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