Investigation of the electrocatalysis for oxygen reduction reaction by Pt and binary Pt alloys: an XRD, XAS and electrochemical study

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Electrocatalysis for the oxygen reduction reaction (ORR) on five binary Pt alloy electrocatalysts (PtCr/C, PtMn/C, PtFe/C, PtCo/C and PtNi/C) supported on carbon have been investigated. The electrochemical characteristics for ORR in a proton conducting fuel cell environment has been correlated with the electronic and structural parameters determined under in situ conditions using XANES and EXAFS technique respectively. Results indicate that all the alloys possess higher Pt 5d band vacancies as compared to Pt/C. There is also evidence of lattice contraction in the alloys (supported by XRD results). Further, the Pt/C shows increase in Pt 5 d band vacancies during potential ... continued below

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12 p.

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Mukerjee, S.; McBreen, J. & Srinivasan, S. December 31, 1995.

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  • Mukerjee, S.
  • McBreen, J. Brookhaven National Lab., Upton, NY (United States)
  • Srinivasan, S. Texas A and M Univ., College Station, TX (United States). Texas Engineering Experiment Station

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Electrocatalysis for the oxygen reduction reaction (ORR) on five binary Pt alloy electrocatalysts (PtCr/C, PtMn/C, PtFe/C, PtCo/C and PtNi/C) supported on carbon have been investigated. The electrochemical characteristics for ORR in a proton conducting fuel cell environment has been correlated with the electronic and structural parameters determined under in situ conditions using XANES and EXAFS technique respectively. Results indicate that all the alloys possess higher Pt 5d band vacancies as compared to Pt/C. There is also evidence of lattice contraction in the alloys (supported by XRD results). Further, the Pt/C shows increase in Pt 5 d band vacancies during potential transitions from 0.54 to 0.84 V vs. RHE, which has been ration@ on the basis of OH type adsorption. In contrast to this, the alloys do not exhibit such an enhancement. Detailed EXAFS analysis supports the presence of OH species on Pt/C and its relative absence in the alloys. Correlation of the electrochemical results with bond distances and d-band vacancies show a volcano type behavior with the PtCr/C on top of the curve.

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12 p.

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OSTI as DE96006775

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  • 188. meeting of the Electrochemical Society, Chicago, IL (United States), 8-13 Oct 1995

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  • Other: DE96006775
  • Report No.: BNL--62646
  • Report No.: CONF-951007--18
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 207041
  • Archival Resource Key: ark:/67531/metadc667270

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  • December 31, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Aug. 8, 2016, 8:46 p.m.

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Mukerjee, S.; McBreen, J. & Srinivasan, S. Investigation of the electrocatalysis for oxygen reduction reaction by Pt and binary Pt alloys: an XRD, XAS and electrochemical study, article, December 31, 1995; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc667270/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.