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Electrocatalysis and redox behavior of Pt2+ ion in CeO2 and Ce0.85Ti0.15O2: XPS evidence of participation of lattice oxygen for high activity

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Abstract

Electronic states of CeO2, Ce1 − x Pt x O2 − δ , and Ce1 − x − y Ti y Pt x O2 − δ electrodes have been investigated by X-ray photoelectron spectroscopy as a function of applied potential for oxygen evolution and formic acid and methanol oxidation. Ionically dispersed platinum in Ce1 − x Pt x O2 − δ and Ce1 − x − y Ti y Pt x O2 − δ is active toward these reactions compared with CeO2 alone. Higher electrocatalytic activity of Pt2+ ions in CeO2 and Ce1 − x Ti x O2 compared with the same amount of Pt0 in Pt/C is attributed to Pt2+ ion interaction with CeO2 and Ce1 − x Ti x O2 to activate the lattice oxygen of the support oxide. Utilization of this activated lattice oxygen has been demonstrated in terms of high oxygen evolution in acid medium with these catalysts. Further, ionic platinum in CeO2 and Ce1 − x Ti x O2 does not suffer from CO poisoning effect unlike Pt0 in Pt/C due to participation of activated lattice oxygen which oxidizes the intermediate CO to CO2. Hence, higher activity is observed toward formic acid and methanol oxidation compared with same amount of Pt metal in Pt/C.

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Acknowledgments

The authors thank the Department of Science and Technology for financial support.

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Authors and Affiliations

  1. Chemical Engineering Department, University of California, Santa Barbara, Santa Barbara, CA, USA

    Sudhanshu Sharma

  2. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, 560012, India

    Preetam Singh & M. S. Hegde

Authors
  1. Sudhanshu Sharma
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  2. Preetam Singh
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  3. M. S. Hegde
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Correspondence to Sudhanshu Sharma or M. S. Hegde.

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Sharma, S., Singh, P. & Hegde, M.S. Electrocatalysis and redox behavior of Pt2+ ion in CeO2 and Ce0.85Ti0.15O2: XPS evidence of participation of lattice oxygen for high activity. J Solid State Electrochem 15, 2185–2197 (2011). https://doi.org/10.1007/s10008-011-1402-z

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  • DOI: https://doi.org/10.1007/s10008-011-1402-z

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