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

Nash, Jared; Zheng, Jie; Wang, Yan; Xu, Bingjun; Yan, Yushan

doi:10.1149/2.051181jes

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

Journal Article · Fri Nov 30 00:00:00 EST 2018 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.051181jes· OSTI ID:1613716

Nash, Jared ^[1]; Zheng, Jie ^[2]; Wang, Yan ^[3]; Xu, Bingjun ^[2]; ^[2]

Univ. of Delaware, Newark, DE (United States); DOE/OSTI
Univ. of Delaware, Newark, DE (United States)
Taiyuan Univ. of Technology, Shanxi (China)

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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Delaware, Newark, DE (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0000771; SC0016537

OSTI ID:: 1613716

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 15 Vol. 165; ISSN 0013-4651

Publisher:: IOP Publishing - The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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