Kim, Myeong-Geun Lee, Hyun Ju Lee, Tae Kyung Lee, Eungjun Jin, Haneul Park, Jae-Hyun Cho, Se Youn Lee, Sungho Ham, Hyung Chul Yoo, Sung Jong 2024-06-07T02:30:22Z 2024-06-07T02:30:22Z 2024-06-07 2024-06 2380-8195 https://pubs.kist.re.kr/handle/201004/150023 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. English American Chemical Society Iridium Selenium Oxyhydroxide Shell for Polymer Electrolyte Membrane Water Electrolyzer with Low Ir Loading Article 10.1021/acsenergylett.4c00884 1 ACS Energy Letters, v.9, no.6, pp.2876 - 2884 ACS Energy Letters 9 6 2876 2884 N scie scopus 001229498600001 2-s2.0-85194033730 Chemistry, Physical Electrochemistry Energy & Fuels Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Science & Technology - Other Topics Materials Science Article OXYGEN EVOLUTION REACTION STABILIZING ROLE PERFORMANCE CATALYST OXIDATION DURABILITY NANOCUBES