Tailored Pt Coatings on Metallic Tin - An Effective Catalyst for Fuel Cells Anodes

Itay Pitussi; Alex Schechter; Hanan Teller; Amir Natan; Haya Kornweitz

doi:10.1149/1945-7111/ab754b

Tailored Pt Coatings on Metallic Tin - An Effective Catalyst for Fuel Cells Anodes

Itay Pitussi, Alex Schechter, Hanan Teller, Amir Natan, Haya Kornweitz

Tel Aviv University, Ariel University

Research output: Contribution to journal › Article › peer-review

Abstract

A thin Pt layer supported on tin (Sn) is suggested as a catalyst with greater CO tolerance for fuel cell anode applications. DFT calculations of the adsorption energy of one CO molecule on one Pt monolayer supported on seven monolayers of Sn show significantly higher values (-1.04 eV/molecule), in comparison with the adsorption energy on 2, 3, and 5 monolayers and metallic Pt(111) (-1.82 - -1.92 eV/molecule). For full CO coverage, the adsorption energy is larger (less negative) in comparison with monometallic Pt (-0.93 eV/molecule) for one (-0.55 eV/molecule) and even two monolayers (-0.83 eV/molecule). Correlation between E _ads-adsorption energy and Pt d-band center (ϵ _d) was found for full coverage of CO. Cyclic voltammetry supports the conclusion that CO is weakly bound on a thin Pt layer coated on metallic Sn. Unlike CO adsorption, methanol adsorption energies on Pt are not affected by the supporting tin (-0.695 eV/molecule for MeOH/Pt₁/Sn₇ in comparison to -0.690 eV/molecule for MeOH/Pt). Thus, a very thin layer of Pt supported on Sn can prevent CO adsorption and may function as an effective catalyst for fuel cells.

Original language	English
Article number	044512
Journal	Journal of the Electrochemical Society
Volume	167
Issue number	4
DOIs	https://doi.org/10.1149/1945-7111/ab754b
State	Published - Mar 2020

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

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10.1149/1945-7111/ab754b

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title = "Tailored Pt Coatings on Metallic Tin - An Effective Catalyst for Fuel Cells Anodes",

abstract = "A thin Pt layer supported on tin (Sn) is suggested as a catalyst with greater CO tolerance for fuel cell anode applications. DFT calculations of the adsorption energy of one CO molecule on one Pt monolayer supported on seven monolayers of Sn show significantly higher values (-1.04 eV/molecule), in comparison with the adsorption energy on 2, 3, and 5 monolayers and metallic Pt(111) (-1.82 - -1.92 eV/molecule). For full CO coverage, the adsorption energy is larger (less negative) in comparison with monometallic Pt (-0.93 eV/molecule) for one (-0.55 eV/molecule) and even two monolayers (-0.83 eV/molecule). Correlation between E ads-adsorption energy and Pt d-band center (ϵ d) was found for full coverage of CO. Cyclic voltammetry supports the conclusion that CO is weakly bound on a thin Pt layer coated on metallic Sn. Unlike CO adsorption, methanol adsorption energies on Pt are not affected by the supporting tin (-0.695 eV/molecule for MeOH/Pt1/Sn7 in comparison to -0.690 eV/molecule for MeOH/Pt). Thus, a very thin layer of Pt supported on Sn can prevent CO adsorption and may function as an effective catalyst for fuel cells.",

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AU - Pitussi, Itay

AU - Schechter, Alex

AU - Teller, Hanan

AU - Natan, Amir

AU - Kornweitz, Haya

PY - 2020/3

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N2 - A thin Pt layer supported on tin (Sn) is suggested as a catalyst with greater CO tolerance for fuel cell anode applications. DFT calculations of the adsorption energy of one CO molecule on one Pt monolayer supported on seven monolayers of Sn show significantly higher values (-1.04 eV/molecule), in comparison with the adsorption energy on 2, 3, and 5 monolayers and metallic Pt(111) (-1.82 - -1.92 eV/molecule). For full CO coverage, the adsorption energy is larger (less negative) in comparison with monometallic Pt (-0.93 eV/molecule) for one (-0.55 eV/molecule) and even two monolayers (-0.83 eV/molecule). Correlation between E ads-adsorption energy and Pt d-band center (ϵ d) was found for full coverage of CO. Cyclic voltammetry supports the conclusion that CO is weakly bound on a thin Pt layer coated on metallic Sn. Unlike CO adsorption, methanol adsorption energies on Pt are not affected by the supporting tin (-0.695 eV/molecule for MeOH/Pt1/Sn7 in comparison to -0.690 eV/molecule for MeOH/Pt). Thus, a very thin layer of Pt supported on Sn can prevent CO adsorption and may function as an effective catalyst for fuel cells.

AB - A thin Pt layer supported on tin (Sn) is suggested as a catalyst with greater CO tolerance for fuel cell anode applications. DFT calculations of the adsorption energy of one CO molecule on one Pt monolayer supported on seven monolayers of Sn show significantly higher values (-1.04 eV/molecule), in comparison with the adsorption energy on 2, 3, and 5 monolayers and metallic Pt(111) (-1.82 - -1.92 eV/molecule). For full CO coverage, the adsorption energy is larger (less negative) in comparison with monometallic Pt (-0.93 eV/molecule) for one (-0.55 eV/molecule) and even two monolayers (-0.83 eV/molecule). Correlation between E ads-adsorption energy and Pt d-band center (ϵ d) was found for full coverage of CO. Cyclic voltammetry supports the conclusion that CO is weakly bound on a thin Pt layer coated on metallic Sn. Unlike CO adsorption, methanol adsorption energies on Pt are not affected by the supporting tin (-0.695 eV/molecule for MeOH/Pt1/Sn7 in comparison to -0.690 eV/molecule for MeOH/Pt). Thus, a very thin layer of Pt supported on Sn can prevent CO adsorption and may function as an effective catalyst for fuel cells.

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DO - 10.1149/1945-7111/ab754b

M3 - مقالة

SN - 0013-4651

VL - 167

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

IS - 4

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ER -

Tailored Pt Coatings on Metallic Tin - An Effective Catalyst for Fuel Cells Anodes

Abstract

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