Electrocatalytic Oxidation of Ammonia on Transition-Metal Surfaces: A First-Principles Study
Journal Article
·
· Journal of Physical Chemistry. C
- Univ. of Wisconsin-Madison, Madison, WI (United States). Dept. of Chemical and Biological Engineering; Department of Chemical and Biological Engineering, University of Wisconsin−Madison
- Univ. of Wisconsin-Madison, Madison, WI (United States). Dept. of Chemical and Biological Engineering
Here, we investigate the catalytic electro-oxidation of ammonia on model close-packed surfaces of Au, Ag, Cu, Pd, Pt, Ni, Ir, Co, Rh, Ru, Os, and Re to derive insights for the reaction mechanism and evaluate the catalysts based on their energy efficiency and activity in the context of their application in fuel cells. Two mechanisms, which are differentiated by their N–N bond formation step, are compared: (1) a mechanism proposed by Gerischer and Mauerer, whereby the N–N bond formation occurs between hydrogenated NHx adsorbed species, and (2) a mechanism in which N–N bond formation occurs between N adatoms. The results of our study show that the mechanism proposed by Gerischer and Mauerer is kinetically preferred and that the formation of N adatoms poisons the surface of the catalyst. On the basis of a simple Sabatier analysis, we predict that Pt is the most active monometallic catalyst followed by Ir and Cu, whereas all other metal surfaces studied here have significantly lower activity. We conclude by outlining some design principles for bimetallic alloy catalysts for NH3 electro-oxidation.
- Research Organization:
- Univ. of Wisconsin-Madison, Madison, WI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Contributing Organization:
- EMSL, a National scientific user facility at Pacific Northwest National Laboratory (PNNL); and the National Energy Research Scientific Computing Center (NERSC); the Center for Nanoscale Materials at Argonne National Laboratory (ANL)
- Grant/Contract Number:
- FG02-05ER15731
- OSTI ID:
- 1405312
- Journal Information:
- Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 26 Vol. 119; ISSN 1932-7447
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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