Investigation of the electrocatalysis for oxygen reduction reaction by Pt and binary Pt alloys: an XRD, XAS and electrochemical study
- Brookhaven National Lab., Upton, NY (United States)
- Texas A and M Univ., College Station, TX (United States). Texas Engineering Experiment Station
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.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Aeronautics and Space Administration, Washington, DC (United States); Texas A and M Univ., College Station, TX (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 207041
- Report Number(s):
- BNL-62646; CONF-951007-18; ON: DE96006775; CNN: Grant NAG 9-533
- Resource Relation:
- Conference: 188. meeting of the Electrochemical Society, Chicago, IL (United States), 8-13 Oct 1995; Other Information: PBD: [1995]
- Country of Publication:
- United States
- Language:
- English
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