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Title: Iridium-Based Nanowires as Highly Active, Oxygen Evolution Reaction Electrocatalysts

Abstract

Iridium-nickel (Ir-Ni) and iridium-cobalt (Ir-Co) nanowires have been synthesized by galvanic displacement and studied for their potential to increase the performance and durability of electrolysis systems. Performances of Ir-Ni and Ir-Co nanowires for the oxygen evolution reaction (OER) have been measured in rotating disk electrode half-cells and single-cell electrolyzers and compared with commercial baselines and literature references. The nanowire catalysts showed improved mass activity, by more than an order of magnitude compared with commercial Ir nanoparticles in half-cell tests. The nanowire catalysts also showed greatly improved durability, when acid-leached to remove excess Ni and Co. Both Ni and Co templates were found to have similarly positive impacts, although specific differences between the two systems are revealed. In single-cell electrolysis testing, nanowires exceeded the performance of Ir nanoparticles by 4-5 times, suggesting that significant reductions in catalyst loading are possible without compromising performance.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [2]; ORCiD logo [2];  [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. Colorado School of Mines, Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), NREL Laboratory Directed Research and Development (LDRD)
OSTI Identifier:
1422695
Report Number(s):
NREL/JA-5900-70739
Journal ID: ISSN 2155-5435
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
ACS Catalysis
Additional Journal Information:
Journal Volume: 8; Journal Issue: 3; Journal ID: ISSN 2155-5435
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; electrochemistry; electrolysis; iridium; nanostructures; oxygen evolution

Citation Formats

Alia, Shaun M., Shulda, Sarah, Ngo, Chilan, Pylypenko, Svitlana, and Pivovar, Bryan S. Iridium-Based Nanowires as Highly Active, Oxygen Evolution Reaction Electrocatalysts. United States: N. p., 2018. Web. https://doi.org/10.1021/acscatal.7b03787.
Alia, Shaun M., Shulda, Sarah, Ngo, Chilan, Pylypenko, Svitlana, & Pivovar, Bryan S. Iridium-Based Nanowires as Highly Active, Oxygen Evolution Reaction Electrocatalysts. United States. https://doi.org/10.1021/acscatal.7b03787
Alia, Shaun M., Shulda, Sarah, Ngo, Chilan, Pylypenko, Svitlana, and Pivovar, Bryan S. Mon . "Iridium-Based Nanowires as Highly Active, Oxygen Evolution Reaction Electrocatalysts". United States. https://doi.org/10.1021/acscatal.7b03787. https://www.osti.gov/servlets/purl/1422695.
@article{osti_1422695,
title = {Iridium-Based Nanowires as Highly Active, Oxygen Evolution Reaction Electrocatalysts},
author = {Alia, Shaun M. and Shulda, Sarah and Ngo, Chilan and Pylypenko, Svitlana and Pivovar, Bryan S.},
abstractNote = {Iridium-nickel (Ir-Ni) and iridium-cobalt (Ir-Co) nanowires have been synthesized by galvanic displacement and studied for their potential to increase the performance and durability of electrolysis systems. Performances of Ir-Ni and Ir-Co nanowires for the oxygen evolution reaction (OER) have been measured in rotating disk electrode half-cells and single-cell electrolyzers and compared with commercial baselines and literature references. The nanowire catalysts showed improved mass activity, by more than an order of magnitude compared with commercial Ir nanoparticles in half-cell tests. The nanowire catalysts also showed greatly improved durability, when acid-leached to remove excess Ni and Co. Both Ni and Co templates were found to have similarly positive impacts, although specific differences between the two systems are revealed. In single-cell electrolysis testing, nanowires exceeded the performance of Ir nanoparticles by 4-5 times, suggesting that significant reductions in catalyst loading are possible without compromising performance.},
doi = {10.1021/acscatal.7b03787},
journal = {ACS Catalysis},
number = 3,
volume = 8,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
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Cited by: 55 works
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Figures / Tables:

Figure 1 Figure 1: Microscopy and spectroscopy of Ir-Ni nanowires, including (a-d) the as-synthesized nanowires (9.3 wt. % Ir) and (e-f) the acid leached nanowires (9.3 wt. % Ir as-synthesized, 90.5 wt. % Ir acid leached, (9.3) 90.5). EDS mapping shows elemental distribution for Ir (red) and Ni (green).

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