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Title: Mechanistic Study of the Hydrogen Oxidation/Evolution Reaction over Bimetallic PtRu Catalysts

Abstract

In this work, the activity of bimetallic PtRu/C with varying amounts of Ru for the hydrogen oxidation/evolution reactions (HOR/HER) was determined. The results demonstrate that surface Ru is not necessary for high activity, which shows that the improved activity of the bimetallic PtRu comes from the electronic interaction of Ru with Pt and the tuning of the hydrogen binding energy (HBE). Using the charge transfer coeffiecient from Butler-Volmer fitting and kinetic modeling, it was determined that Ru affects the HOR/HER mechanism in two ways: changing the pathway from Tafel-Volmer to Heyrovsky-Volmer, and lowering of the activation barrier of the Volmer step. Utilizing catalysts with Heyrovsky-Volmer(RDS) mechanism as well as focusing on tuning the HBE might help improve the activity of non-precious metal catalysts; allowing PGM-free fuel cells to become economically viable.

Authors:
 [1];  [1];  [2];  [1]; ORCiD logo [1]
  1. Univ. of Delaware, Newark, DE (United States)
  2. Taiyuan Univ. of Technology, Shanxi (China)
Publication Date:
Research Org.:
Univ. of Delaware, Newark, DE (United States)
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1613716
Grant/Contract Number:  
AR0000771; SC0016537
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 165; Journal Issue: 15; Journal ID: ISSN 0013-4651
Publisher:
IOP Publishing - The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Electrochemistry; Materials Science

Citation Formats

Nash, Jared, Zheng, Jie, Wang, Yan, Xu, Bingjun, and Yan, Yushan. Mechanistic Study of the Hydrogen Oxidation/Evolution Reaction over Bimetallic PtRu Catalysts. United States: N. p., 2018. Web. doi:10.1149/2.051181jes.
Nash, Jared, Zheng, Jie, Wang, Yan, Xu, Bingjun, & Yan, Yushan. Mechanistic Study of the Hydrogen Oxidation/Evolution Reaction over Bimetallic PtRu Catalysts. United States. https://doi.org/10.1149/2.051181jes
Nash, Jared, Zheng, Jie, Wang, Yan, Xu, Bingjun, and Yan, Yushan. Fri . "Mechanistic Study of the Hydrogen Oxidation/Evolution Reaction over Bimetallic PtRu Catalysts". United States. https://doi.org/10.1149/2.051181jes. https://www.osti.gov/servlets/purl/1613716.
@article{osti_1613716,
title = {Mechanistic Study of the Hydrogen Oxidation/Evolution Reaction over Bimetallic PtRu Catalysts},
author = {Nash, Jared and Zheng, Jie and Wang, Yan and Xu, Bingjun and Yan, Yushan},
abstractNote = {In this work, the activity of bimetallic PtRu/C with varying amounts of Ru for the hydrogen oxidation/evolution reactions (HOR/HER) was determined. The results demonstrate that surface Ru is not necessary for high activity, which shows that the improved activity of the bimetallic PtRu comes from the electronic interaction of Ru with Pt and the tuning of the hydrogen binding energy (HBE). Using the charge transfer coeffiecient from Butler-Volmer fitting and kinetic modeling, it was determined that Ru affects the HOR/HER mechanism in two ways: changing the pathway from Tafel-Volmer to Heyrovsky-Volmer, and lowering of the activation barrier of the Volmer step. Utilizing catalysts with Heyrovsky-Volmer(RDS) mechanism as well as focusing on tuning the HBE might help improve the activity of non-precious metal catalysts; allowing PGM-free fuel cells to become economically viable.},
doi = {10.1149/2.051181jes},
url = {https://www.osti.gov/biblio/1613716}, journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 15,
volume = 165,
place = {United States},
year = {2018},
month = {11}
}

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Cited by: 7 works
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Works referenced in this record:

Pt–Ru catalyzed hydrogen oxidation in alkaline media: oxophilic effect or electronic effect?
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    Works referencing / citing this record:

    High-Performance Hydroxide Exchange Membrane Fuel Cells through Optimization of Relative Humidity, Backpressure and Catalyst Selection
    journal, January 2019