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Self-Anchored Platinum-Decorated Antimony-Doped-Tin Oxide as a Durable Oxygen Reduction Electrocatalyst

  • Cheng He
    Cheng He
    Center for Solar Energy and Energy Storage and Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States
    More by Cheng He
  • Shrihari Sankarasubramanian
    Shrihari Sankarasubramanian
    Center for Solar Energy and Energy Storage and Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States
  • Andrew Ells
    Andrew Ells
    Center for Solar Energy and Energy Storage and Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States
    More by Andrew Ells
  • Javier Parrondo
    Javier Parrondo
    Nissan Technical Center North America, Farmington Hills, Michigan 48331, United States
  • Cenk Gumeci
    Cenk Gumeci
    Nissan Technical Center North America, Farmington Hills, Michigan 48331, United States
    More by Cenk Gumeci
  • Mounika Kodali
    Mounika Kodali
    Department of Chemical and Biomolecular Engineering, National Fuel Cell Research Center, University of California, Irvine, Irvine, California 92697, United States
  • Ivana Matanovic
    Ivana Matanovic
    Department of Chemical and Biological Engineering, Center for Micro-Engineered Materials, University of New Mexico, Albuquerque, New Mexico 87131, United States
    Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
  • Ashok Kumar Yadav
    Ashok Kumar Yadav
    Atomic & Molecular Physics Division, Bhabha Atomic Research Center, Mumbai, Maharashtra 400094, India
  • Kaustava Bhattacharyya
    Kaustava Bhattacharyya
    Chemistry Division, Bhabha Atomic Research Center, Mumbai, Maharashtra 400094, India
  • Nilesh Dale
    Nilesh Dale
    Nissan Technical Center North America, Farmington Hills, Michigan 48331, United States
    More by Nilesh Dale
  • Plamen Atanassov*
    Plamen Atanassov
    Department of Chemical and Biomolecular Engineering, National Fuel Cell Research Center, University of California, Irvine, Irvine, California 92697, United States
    *Email: [email protected]
  • , and 
  • Vijay K. Ramani*
    Vijay K. Ramani
    Center for Solar Energy and Energy Storage and Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States
    *Email: [email protected]
Cite this: ACS Catal. 2021, 11, 12, 7006–7017
Publication Date (Web):June 1, 2021
https://doi.org/10.1021/acscatal.1c00963
Copyright © 2021 American Chemical Society

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    Abstract

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    The lifetime of commercial proton exchange membrane fuel cells (PEMFCs) is circumscribed by the insufficient durability of commercial catalysts. The use of metal oxide supports in place of carbon significantly increases electrocatalyst durability. Herein, following density functional theory predictions of improved platinum (Pt) stability on antimony-doped tin oxide (ATO) supports, we synthesized ATO whose morphology and crystal structure were engineered using a Pt-anchoring technique. X-ray photoelectron spectroscopy indicated that the Pt anchor sites aided in the reduction of Pt precursors to Pt on the ATO surface. X-ray absorption near-edge spectroscopy revealed the existence of strong metal–support interactions (SMSIs) between Pt and ATO. The combination of SMSIs and high control over Pt dispersion enabled the Pt/Pt-aerogel-ATO (Pt supported on aerogel ATO with Pt anchor sites) electrocatalyst to achieve 2 × the area-specific activity of Pt/C in ex situ testing. In a H2/air PEMFC, Pt/Pt-aerogel-ATO cathodes enabled 20% higher peak power density and <1/6 the loss of active surface area as compared to Pt/C. In a PEMFC under rigorous potential cycling, the Pt/Pt-aerogel-ATO retained its initial peak power density as opposed to a 58% loss for Pt/C. Furthermore, cost models indicate that Pt/Pt-aerogel-ATO is 26% less expensive than Pt/C over its useful lifetime.

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