Potential Dependence of Pt and Co Dissolution from Platinum-Cobalt Alloy PEFC Catalysts Using Time-Resolved Measurements

Ahluwalia, Rajesh K.; Papadias, Dionissios D.; Kariuki, Nancy N.; Peng, Jui-Kun; Wang, Xiaoping; Tsai, Yifen; Graczyk, Donald G.; Myers, Deborah J.

doi:10.1149/2.0031806jes

Title: Potential Dependence of Pt and Co Dissolution from Platinum-Cobalt Alloy PEFC Catalysts Using Time-Resolved Measurements

Journal Article · Fri Feb 09 00:00:00 EST 2018 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.0031806jes· OSTI ID:1420208

; Papadias, Dionissios D.; Kariuki, Nancy N.; Peng, Jui-Kun; Wang, Xiaoping; Tsai, Yifen; Graczyk, Donald G.;

An electrochemical flow cell system with catalyst-ionomer ink deposited on glassy carbon is used to investigate the aqueous stability of commercial PtCo alloys under cyclic potentials. An on-line inductively coupled plasma-mass spectrometer, capable of real-time measurements, is used to resolve the anodic and cathodic dissolution of Pt and Co during square-wave and triangle-wave potential cycles. We observe Co dissolution at all potentials, distinct peaks in anodic and cathodic Pt dissolution rates above 0.9 V, and potential-dependent Pt and Co dissolution rates. The amount of Pt that dissolves cathodically is smaller than the amount that dissolves anodically if the upper potential limit (UPL) is lower than 0.9 V. At the highest UPL investigated, 1.0 V, the cathodic dissolution greatly exceeds the anodic dissolution. A non-ideal solid solution model indicates that the anodic dissolution can be associated with the electrochemical oxidation of Pt and PtOH to Pt²⁺, and the cathodic dissolution to electrochemical reduction of a higher Pt oxide, PtO_x (x > 1), to Pt²⁺. Pt also dissolves oxidatively during the cathodic scans but in smaller amounts than due to the reductive dissolution of PtO_x. The relative amounts Pt dissolving oxidatively as Pt and PtOH depend on the potential cycle and UPL.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Hydrogen Fuel Cell Technologies Office (HFTO); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1420208

Alternate ID(s):: OSTI ID: 1437368

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Vol. 165 Journal Issue: 6; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 56 works

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