Kim, Sol Woo, Jinwoo Ngo, Yen-Linh Thi Park, Hee-Young Kim, Jin Young Jang, Jong Hyun Seo, Bora 2025-04-09T08:31:09Z 2025-04-09T08:31:09Z 2025-04-09 2025-05 1613-6810 https://pubs.kist.re.kr/handle/201004/152233 The development of high-performance, low-content Ir catalysts is essential for enhancing the cost efficiency of anode catalysts and accelerating the widespread adoption of proton exchange membrane water electrolysis (PEMWE) for sustainable hydrogen production. Existing strategies, such as reducing catalyst particle size and alloying with non-precious metals, have shown limited success in surpassing the intrinsic activity of commercial IrO2 catalysts. This study presents a novel synthesis strategy for IrOx catalyst using NaCl as a structure modifier, delivering a catalyst (IrOx_NaCl) that achieves an impressive current density of 2.48 A cm(-2) at 1.9 V, outperforming commercial IrO2 (2.35 A cm(-2)), even under low Ir catalyst loading in single-cell PEMWE test. Ex situ and in situ spectroscopic analyses suggested that NaCl incorporation effectively modulates the oxidation states and coordination structure of IrOx, leading to enhanced activity, improved stability, and greater cost efficiency. These findings offer a transformative pathway for designing advanced Ir-based catalysts for PEMWE applications. English Wiley - V C H Verlag GmbbH & Co. NaCl Modification: A Novel Strategy for Boosting Oxygen Evolution Activity of Ir Catalysts in Proton Exchange Membrane Water Electrolysis Article 10.1002/smll.202412083 1 Small, v.21, no.18 Small 21 18 N scie scopus 001451501000001 2-s2.0-105000903271 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article IRIDIUM OXIDE THIN-FILMS ELECTROCATALYSTS NANOPARTICLES SPECTROSCOPY OXIDATION iridium oxide catalyst NaCl modification oxygen evolution reaction proton exchange membrane water electrolysis electronic structure modulation