The Effect of Carbonate and pH on Hydrogen Oxidation and Oxygen Reduction on Pt-Based Electrocatalysts in Alkaline Media

John, Samuel St.; Atkinson, Robert W.; Roy, Asa; Unocic, Raymond R.; Papandrew, Alexander B.; Zawodzinski, Thomas A.

doi:10.1149/2.1071603jes

Title: The Effect of Carbonate and pH on Hydrogen Oxidation and Oxygen Reduction on Pt-Based Electrocatalysts in Alkaline Media

Journal Article · Mon Jan 11 00:00:00 EST 2016 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.1071603jes· OSTI ID:1335336

John, Samuel St. ^[1]; Atkinson, Robert W. ^[1]; Roy, Asa ^[1]; Unocic, Raymond R. ^[2]; Papandrew, Alexander B. ^[1]; Zawodzinski, Thomas A. ^[3]

Univ. of Tennessee, Knoxville, TN (United States). Chemical and Biomolecular Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences
Univ. of Tennessee, Knoxville, TN (United States). Chemical and Biomolecular Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division

In this paper, we investigated the performance of several carbon-supported Ru_xPt_y electrocatalysts for their alkaline hydrogen oxidation and oxygen reduction performance in the presence of carbonate and compared their performance with monometallic, carbon-supported Pt. Our results indicate a strong dependence of HOR upon pH for the monometallic Pt catalysts (22 mV/pH) and a weak dependence upon pH for the Ru-containing electrocatalysts (3.7, 2.5, and 4.7 mV/pH on Ru_0.2Pt_0.8, Ru_0.4Pt_0.6, and Ru_0.8Pt_0.2, respectively). These results are consistent with our previous findings that illustrate a change in rds from electron transfer (on monometallic Pt) to dissociative hydrogen adsorption (on Ru_xPt_y catalysts). Analysis of the kinetic currents to determine the rate-determining step via Tafel slope analysis provides additional data supporting this conclusion. There is no difference in the performance at comparable pH values in the presence or absence of carbonate on monometallic Pt indicating that water/hydroxide is the primary proton acceptor for alkaline HOR in 0.1 M KOH aqueous electrolyte. Finally, we observe no pH or carbonate dependence for the ORR on monometallic Pt.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357

OSTI ID:: 1335336

Journal Information:: Journal of the Electrochemical Society, Vol. 163, Issue 3; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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The Effect of Ambient Carbon Dioxide on Anion-Exchange Membrane Fuel Cells Ziv, Noga; Mustain, William E.; Dekel, Dario R. ChemSusChem, Vol. 11, Issue 7 https://doi.org/10.1002/cssc.201702330	journal	March 2018
Origin of Superior HOR/HER Activity of Bimetallic Pt-Ru Catalysts in Alkaline Media Identified via Ru@Pt Core-Shell Nanoparticles Schwämmlein, Jan N.; Stühmeier, Björn M.; Wagenbauer, Klaus Journal of The Electrochemical Society, Vol. 165, Issue 5 https://doi.org/10.1149/2.0791805jes	journal	January 2018
Anion Exchange Membrane Fuel Cell Performance in the Presence of Carbon Dioxide: An Investigation into the Self-Purging Mechanism Wrubel, Jacob A.; Peracchio, Aldo A.; Cassenti, Brice N. Journal of The Electrochemical Society, Vol. 166, Issue 12 https://doi.org/10.1149/2.0801912jes	journal	January 2019

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
alkaline
carbonate
hydrogen oxidation
oxygen reduction
platinum
ruthenium

Title: The Effect of Carbonate and pH on Hydrogen Oxidation and Oxygen Reduction on Pt-Based Electrocatalysts in Alkaline Media

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