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Transition-Metal Nitride Core@Noble-Metal Shell Nanoparticles as Highly CO Tolerant Catalysts |
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| Authors: | Aaron Garg Maria Milina Madelyn Ball Prof Daniela Zanchet Sean T Hunt Prof James A Dumesic Prof Yuriy Román-Leshkov |
| Institution: | 1. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139 USA;2. Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, WI, 53706 USA;3. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139 USA
Institute of Chemistry, University of Campinas, Campinas, SP, 13083-970 Brazil |
| Abstract: | 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. 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. |
| Keywords: | carbides CO tolerance core–shell nanoparticles electrocatalysis nitrides |