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Updated: May 1, 2026

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
Published on: April 27, 2018
Different reactivity of the various platinum oxides and chemisorbed oxygen in CO oxidation on Pt(111)
Daniel Miller1, Hernan Sanchez Casalongue, Hendrik Bluhm
1SUNCAT Center for Interface Science and Catalysis and §Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory , 2575 Sand Hill Rd, Menlo Park, California 94025, United States.
Abstract:
We have used X-ray photoelectron spectroscopy and polarization-resolved O K-edge X-ray absorption spectroscopy to investigate the reactivity of various oxygen covered Pt(111) surfaces, which emerge under high temperature and pressure conditions, toward CO. We find that the reactivity of the O/Pt(111) system decreases monotonically with increasing oxygen coverage. Of the three surface oxygen phases, viz., chemisorbed oxygen (O(ad)), a PtO-like surface oxide, and α-PtO2 trilayers, Oad exhibits the highest reactivity toward CO, whereas α-PtO2 trilayers exhibit the lowest. Pt(111) surfaces fully terminated by α-PtO2 trilayers are inert to CO. Here it is proposed that the reactive phase is either O(ad) or PtO-like surface oxide phase on bare non-CO poisoned Pt regions with PtO2 as majority spectator species.
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