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    Research Article

    Boosting the Role of Ir in Mitigating Corrosion of Carbon Support by Alloying with Pt
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    • Junu Bak
      Junu Bak
      Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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    • Haesol Kim
      Haesol Kim
      School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea
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    • SangJae Lee
      SangJae Lee
      Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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    • MinJoong Kim
      MinJoong Kim
      Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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    • Eom-Ji Kim
      Eom-Ji Kim
      Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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    • JeongHan Roh
      JeongHan Roh
      Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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    • JaeWook Shin
      JaeWook Shin
      Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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      Orcidhttp://orcid.org/0000-0002-7431-9255
    • Chang Hyuck Choi
      Chang Hyuck Choi
      School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea
      More by Chang Hyuck Choi
      Orcidhttp://orcid.org/0000-0002-2231-6116
    • EunAe Cho*
      EunAe Cho
      Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
      *Email: [email protected]
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      Orcidhttp://orcid.org/0000-0002-2871-6903
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    ACS Catalysis

    Cite this: ACS Catal. 2020, 10, 20, 12300–12309
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    https://doi.org/10.1021/acscatal.0c02845
    Published September 29, 2020
    Copyright © 2020 American Chemical Society
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    Abstract

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    Corrosion of carbon support is one of the most crucial causes of the degradation of polymer electrolyte membrane fuel cells (PEMFCs) utilizing carbon-supported platinum nanoparticles (Pt/C) as a catalyst. To mitigate carbon corrosion, Pt is alloyed with iridium (Ir), which is catalytically active for the oxygen evolution reaction (OER), with various compositions of PtxIry. The carbon-supported PtxIry alloy catalysts (PtxIry/C) show slightly lower initial activity for the oxygen reduction reaction (ORR) than Pt/C. However, the ORR activities of the PtxIry/C catalysts increase with repeating potential cycles from 1.0 to 1.5 VRHE, while Pt/C exhibits a rapid decay in the ORR activity and a mixture of Pt/C and Ir/C (Pt/C + Ir/C, Pt-to-Ir ratio of 85:15) maintains its initial activity. After 5k potential cycles, the mass activity of Pt85Ir15 was 0.071 A mgPGM–1, which is significantly higher than that of Pt/C (0.017 A mgPGM–1) and Pt/C + Ir/C (0.039 A mgPGM–1). These results can be attributed to the atomically distributed Ir in Pt85Ir15. Clearly, carbon corrosion occurs in Pt/C and in Pt-rich regions of Pt/C + Ir/C, whereas the carbon support in Pt85Ir15/C is effectively protected from corrosion. As a result, the greatest amount of CO2 emission is detected as coming from Pt/C, followed by Pt/C + Ir/C and Pt85Ir15/C. During the potential cycles, high-index Pt facets are formed on the surface of Pt85Ir15/C, leading to an increase in the ORR activity. When employed as cathode catalysts of a PEMFC, Pt85Ir15/C exhibits improved durability compared to Pt/C and Pt/C + Ir/C under high-voltage cycles to 1.5 V (5k cycles). This work demonstrates that the atomic distribution of Ir in Pt is an effective strategy for mitigating corrosion of the carbon support and to enhance the durability of PEMFCs exposed to high potentials.

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    • Schematic illustration and bottom-view and front-view photographic images of a scanning flow cell; rotating disk electrode and Teflon cap for IL-TEM measurements; TEM images and particle size distribution; X-ray diffraction patterns of Pt/C, Pt92Ir8/C, Pt88Ir12/C, Pt85Ir15/C, Pt81Ir19/C, and Ir/C; ORR polarization curves; and geometrical current density and mass activities for ORR and OER of the Pt/C, Ir/C, Pt92Ir8/C, Pt88Ir12/C, Pt85Ir15/C, and Pt81Ir19/C (PDF)

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    ACS Catalysis

    Cite this: ACS Catal. 2020, 10, 20, 12300–12309
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acscatal.0c02845
    Published September 29, 2020
    Copyright © 2020 American Chemical Society
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