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

Alia, Shaun M.; Shulda, Sarah; Ngo, Chilan; Pylypenko, Svitlana; Pivovar, Bryan S.

doi:10.1021/acscatal.7b03787

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

Journal Article · Mon Jan 22 00:00:00 EST 2018 · ACS Catalysis

DOI:https://doi.org/10.1021/acscatal.7b03787· OSTI ID:1422695

^[1]; Shulda, Sarah ^[2];

^[2];

^[2]; Pivovar, Bryan S. ^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States)
Colorado School of Mines, Golden, CO (United States)

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.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), NREL Laboratory Directed Research and Development (LDRD)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1422695

Report Number(s):: NREL/JA-5900-70739

Journal Information:: ACS Catalysis, Vol. 8, Issue 3; ISSN 2155-5435

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 147 works

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Figures / Tables (8)

Table 1: Part 1(p. 25)

Table 1: Part 2(p. 26)

Figure 6(p. 27)

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