Iridium Selenium Oxyhydroxide Shell for Polymer Electrolyte Membrane Water Electrolyzer with Low Ir Loading

Authors
Kim, Myeong-GeunLee, Hyun JuLee, Tae KyungLee, EungjunJin, HaneulPark, Jae-HyunCho, Se YounLee, SunghoHam, Hyung ChulYoo, Sung Jong
Issue Date
2024-06
Publisher
American Chemical Society
Citation
ACS Energy Letters, v.9, no.6, pp.2876 - 2884
Abstract
Low-Ir electrocatalysts are crucial for developing large-scale polymer-electrolyte-membrane water electrolysis (PEMWE) facilities, which are necessary to advance the hydrogen economy. However, the performance and durability of low-Ir electrocatalysts are unsatisfactory. To address this issue, we prepared selenium-modified Ir nanoparticles on high-crystalline-carbon (HCC) supports. The introduction of HCC supports effectively reduced Ir usage, and Se incorporation mitigated Ir degradation. Se nucleophiles suppressed the electrochemical oxidation of Ir, leading to the formation of a unique nanostructure featuring an ultrathin IrOxHySez shell and a crystalline Ir core. Theoretical calculations indicated that the electronic structure of Ir and its binding affinity with *O were modified, thereby enhancing the catalytic activities. Ir-IrOxHySez/HCC exhibited outstanding PEMWE performances (Ir-mass specific power of 23.69 kW<middle dot>gIr(-1); durability for 370 h) with a small amount of Ir (0.05 mg<middle dot>cm(-2)). Thus, employing a carbon support and nucleophile-induced nanostructures can serve as a strategy to ensure long-term PEMWE performance while reducing Ir usage.
Keywords
OXYGEN EVOLUTION REACTION; STABILIZING ROLE; PERFORMANCE; CATALYST; OXIDATION; DURABILITY; NANOCUBES
ISSN
2380-8195
URI
https://pubs.kist.re.kr/handle/201004/150023
DOI
10.1021/acsenergylett.4c00884
Appears in Collections:
KIST Article > 2024
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