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

Myeong Geun Kim, Hyun Ju Lee, Tae Kyung Lee, Eungjun Lee, Haneul Jin, Jae Hyun Park, Se Youn Cho, Sungho Lee, Hyung Chul Ham, Sung Jong Yoo

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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·gIr-1; durability for 370 h) with a small amount of Ir (0.05 mg·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.

Original languageEnglish
Pages (from-to)2876-2884
Number of pages9
JournalACS Energy Letters
Volume9
Issue number6
DOIs
StatePublished - 14 Jun 2024

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