Chemical Structure of Fe–Ni Nanoparticles for Efficient Oxygen Evolution Reaction Electrocatalysis

Acharya, Prashant; Nelson, Zachary J.; Benamara, Mourad; Manso, Ryan H.; Bakovic, Sergio I.  Perez; Abolhassani, Mojtaba; Lee, Sungsik; Reinhart, Benjamin; Chen, Jingyi; Greenlee, Lauren F.

doi:10.1021/acsomega.9b01692

Title: Chemical Structure of Fe–Ni Nanoparticles for Efficient Oxygen Evolution Reaction Electrocatalysis

Journal Article · Fri Oct 11 00:00:00 EDT 2019 · ACS Omega

DOI:https://doi.org/10.1021/acsomega.9b01692· OSTI ID:1570063

Acharya, Prashant; Nelson, Zachary J.; Benamara, Mourad; Manso, Ryan H.; Bakovic, Sergio I. Perez; Abolhassani, Mojtaba;

^[1]; Reinhart, Benjamin ^[1];

;

Advanced Photon Source, Argonne National Lab, Argonne, Illinois 60439, United States

Bimetallic iron-nickel-based nanocatalysts are perhaps the most active for the oxygen evolution reaction (OER) in alkaline electrolyte. Recent developments in literature have suggested that the ratio of iron and nickel in Fe-Ni thin films plays an essential role in the performance and stability of the catalysts. In this work, the metallic ratio of iron to nickel was tested in alloy bimetallic nanoparticles. Similar to thin films, nanoparticles with iron-nickel atomic compositions where the atomic iron percentage is ≤ 50% outperformed nanoparticles with iron-nickel ratios of > 50%. Nanoparticles of Fe20Ni80, Fe50Ni50, and Fe80Ni20 compositions were evaluated and demonstrated to have overpotentials of 313 mV, 327 mV, and 364 mV, respectively, at a current density of 10 mA/cm2. While the Fe20Ni80 composition might be considered to have the best OER performance at low current densities, Fe50Ni50 was found to have the best current density performance at higher current densities, making this composition particularly relevant for electrolysis conditions. However, when stability was evaluated through chronoamperometry and chronopotentiometry, the Fe80Ni20 composition resulted in the lowest degradation rates of 2.9 μA/h and 17.2 μV/h, respectively. These results suggest that nanoparticles with higher iron and lower nickel content, such as the Fe80Ni20 composition, should be still taken into consideration while optimizing these bimetallic OER catalysts for overall electrocatalytic performance. Characterization by electron microscopy, diffraction, and x-ray spectroscopy provides detailed chemical and structural information on as-synthesized nanoparticle materials.

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Research Organization:: Univ. of Arkansas, Fayetteville, AR (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0016529; AC02-06CH11357

OSTI ID:: 1570063

Alternate ID(s):: OSTI ID: 1571445; OSTI ID: 1578030

Journal Information:: ACS Omega, Journal Name: ACS Omega Vol. 4 Journal Issue: 17; ISSN 2470-1343

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
catalysts
electrochemistry
iron
nanoparticles
nickel
oxygen evolution reaction
x-ray absorption spectroscopy

Title: Chemical Structure of Fe–Ni Nanoparticles for Efficient Oxygen Evolution Reaction Electrocatalysis

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