Kim, Jun Kwon, Taehyun Lee, Jaeseung Lee, Hyun Ju Jun, Minki Ham, Hyung Chul Ju, Hyunchul Kim, Sangwon Kim, Jin Young 2024-08-01T06:01:00Z 2024-08-01T06:01:00Z 2024-08-01 2024-09 1614-6832 https://pubs.kist.re.kr/handle/201004/150347 Highly active Ir electrocatalysts based on ultralow loading for proton exchange membrane water electrolysis (PEMWE) applications are desirable to achieve gigawatt production levels. However, no clear direction has been developed yet to achieve that scale. Here, newly-synthesized Ir-based jagged nanotubes (J-IrNTs) with the ultrahigh electrode performance of 10 A mg(Ir)(-1) at 1.6 V in a PEMWE cell at Ir loadings as low as 0.05 mg(Ir) cm(-2) are reported, outperforming previously reported Ir-based electrocatalysts. The Ir-JrNT also exhibits only marginal degradation in stability tests. Notably, the resulting electrode of Ir-JrNT provides enhanced intrinsic catalytic activity and high surface area for efficient electrocatalysis, with hierarchical branching composed of interconnected multiscale channels and highly corrugated surface textures, for facile mass transport. The findings demonstrate that the jagged nanotubular structure is a promising approach for overcoming the limitations associated with Ir-based electrocatalysts and developing sustainable advanced PEMWE. English Wiley-VCH Verlag Ultrahigh Electrode Performance of Low-Loaded Iridium Jagged Nanotubes for Water Electrolysis Applications Article 10.1002/aenm.202400999 1 Advanced Energy Materials, v.14, no.34 Advanced Energy Materials 14 34 Y scie scopus 001252633100001 2-s2.0-85196003576 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Energy & Fuels Materials Science Physics Article OXYGEN EVOLUTION REACTION STABILITY MECHANISMS CATALYST HYDROGEN ANODES XANES iridium jagged nanotube oxygen evolution reaction PEMWE water electrolysis