Durable, OER-Active Compositions of Pt, Ir, and Ru for PEM Fuel Cell Start-Stop Protection

Harlow, Jessie; Stevens, David A.; Sanderson, R. J.; Watson, Cody; Crowtz, T. C.; Dahn, J. R.; Haugen, Gregory M.; Atanasoska, Liliana; Vernstrom, George D.; Atanasoski, Radoslav

doi:10.1149/05002.1575ecst

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Under electrochemical conditions, the affinitive adsorption of a significant number of hydroxyl groups allows the comparison of iridium (Ir)-based bimetals on account of bifunctional abilities with its Ru-based counterparts (Scheme S1). This is because of electrocatalytic water splitting, wherein Ir species are generally utilized for oxygen evolution reactions in an electrocatalytic surface reaction that is similar to that of Ru, such as the facile adsorption capabilities of hydroxyl groups under low potential. − Furthermore, because Ru is a rare metal, the use of Ir could results in the extension of conjugate species in DMFC anodes.…”

Section: Introductionmentioning

confidence: 99%

Active Methanol Oxidation Reaction by Enhanced CO Tolerance on Bimetallic Pt/Ir Electrocatalysts Using Electronic and Bifunctional Effects

Kwon¹,

Ham

Kim³

et al. 2018

ACS Appl. Mater. Interfaces

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Platinum-based metal alloys have been generally developed to provide high carbon monoxide resistance in the anodes of direct methanol fuel cells. We report the potential of bimetallic platinum/iridium electrocatalysts in preserving the outstanding carbon monoxide tolerance obtained from both experimental and theoretical studies, which represents the enhanced electrochemical performance of methanol oxidation and the in-depth and stepwise investigations for reaction mechanisms, respectively. In this study, the findings highlight the dual-enhancement characteristics of low carbon monoxide adsorption energy (electronic effect) and carbon monoxide oxidative removal (bifunctional effect) compared with various electrocatalysts such as platinum, iridium, and platinum/ruthenium alloys. In addition, the reaction affinity of platinum/iridium alloys for methanol dehydrogenation is also studied in accordance with atomistic properties, such as adsorption energy and electronic band gap, to understand the electrochemical performance compared to Pt. The results obtained indicate that the platinum/iridium alloy surface played diverse roles in terms of its multifunctional behaviors for carbon monoxide tolerance, including the favorable mechanism of methanol dehydrogenation. It turns out that throughout the theoretical in-depth studies, platinum/iridium alloys are promising candidates in terms of the extension for electrocatalytic material designs that differ from Ru in direct methanol fuel cells.

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