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Title: Transition-Metal Nitride Core@Noble-Metal Shell Nanoparticles as Highly CO Tolerant Catalysts

Core–shell architectures offer an effective way to tune and enhance the properties of noble-metal catalysts. Herein, we demonstrate the synthesis of Pt shell on titanium tungsten nitride core nanoparticles (Pt/TiWN) by high temperature ammonia nitridation of a parent core–shell carbide material (Pt/TiWC). X-ray photoelectron spectroscopy revealed significant core-level shifts for Pt shells supported on TiWN cores, corresponding to increased stabilization of the Pt valence d-states. The modulation of the electronic structure of the Pt shell by the nitride core translated into enhanced CO tolerance during hydrogen electrooxidation in the presence of CO. In conclusion, the ability to control shell coverage and vary the heterometallic composition of the shell and nitride core opens up attractive opportunities to synthesize a broad range of new materials with tunable catalytic properties.
Authors:
ORCiD logo [1] ;  [1] ;  [2] ;  [3] ;  [1] ;  [2] ; ORCiD logo [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Univ. of Wisconsin-Madison, Madison, WI (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of Campinas, Campinas, SP (Brazil)
Publication Date:
Grant/Contract Number:
SC0016214; SC0014058
Type:
Accepted Manuscript
Journal Name:
Angewandte Chemie (International Edition)
Additional Journal Information:
Journal Name: Angewandte Chemie (International Edition); Journal Volume: 56; Journal Issue: 30; Journal ID: ISSN 1433-7851
Publisher:
Wiley
Research Org:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Contributing Orgs:
University of Wisconsin Materials Research Science and Engineering Center; Advanced Photon Source at Argonne National Laboratory; and the Brazilian Synchrotron Light Laboratory
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Carbides; CO tolerance; core–shell nanoparticles; electrocatalysis; nitrides
OSTI Identifier:
1434317
Alternate Identifier(s):
OSTI ID: 1401805