Abstract
(Graph Presented) Iron-incorporated nickel-based materials show promise as catalysts for the oxygen evolution reaction (OER) half-reaction of water electrolysis. Nickel has also exhibited high catalytic activity for methanol oxidation, particularly when in the form of a bimetallic catalyst. In this work, bimetallic iron-nickel nanoparticles were synthesized using a multistep procedure in water under ambient conditions. When compared to monometallic iron and nickel nanoparticles, Fe-Ni nanoparticles show enhanced catalytic activity for both OER and methanol oxidation under alkaline conditions. At 1 mA/cm2, the overpotential for monometallic iron and nickel nanoparticles was 421 and 476 mV, respectively, while the bimetallic Fe-Ni nanoparticles had a greatly reduced overpotential of 256 mV. At 10 mA/cm2, bimetallic Fe-Ni nanoparticles had an overpotential of 311 mV. Spectroscopy characterization suggests that the primary phase of nickel in Fe-Ni nanoparticles is the more disordered alpha phase of nickel hydroxide.
Original language | English (US) |
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Pages (from-to) | 365-379 |
Number of pages | 15 |
Journal | ACS Catalysis |
Volume | 7 |
Issue number | 1 |
DOIs | |
State | Published - Jan 6 2017 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2016 American Chemical Society.
Keywords
- alcohol oxidation
- core-shell nanoparticles
- electrocatalyst
- fuel cell
- nonprecious metal
- oxygen evolution reaction