Lee, Eungjun Jin, Haneul Jo, Hyesung Kim, Myeong-Geun Park, Jae Hyun Baik, Jieun Park, Jong Seok Jang, Jue-Hyuk Kim, Seung-Hoon Lee, Dong Wook Choi, Jihyun Ryu, Jong Kyeong Choi, Daeil Kim, Juyoung Kim, Sang Moon Sung, Yung-Eun Lee, Kug-Seung Ahn, Docheon Yang, Yongsoo Chun, Dong Won Yoo, Sung Jong 2025-05-22T06:01:06Z 2025-05-22T06:01:06Z 2025-05-21 2025-09 0935-9648 https://pubs.kist.re.kr/handle/201004/152475 Rational design of catalytic nanomaterials is essential for developing high-performance fuel cell catalysts. However, structural degradation and elemental dissolution during operation pose significant challenges to achieving long-term stability. Herein, the development of multi-grained NiPt nanocatalysts featuring an atomically ordered Ni3Pt5 phase within intragrain is reported. Ultrasound-assisted synthesis facilitates atomic transposition by supplying sufficient diffusion energy along grain boundaries, enabling unprecedented phase formation. The Ni3Pt5 embedded nanocatalysts exhibit outstanding proton exchange membrane fuel cell performance under both light-duty and heavy-duty vehicle conditions, with significantly reduced Ni dissolution. Under light-duty vehicle conditions, the catalyst achieves a mass activity of 0.94 A mgPt-1 and a 421 mA cm-2 current density (@ 0.8 V in air), retaining 78% of its initial mass activity after long-term operation. Under heavy-duty vehicle conditions, the multi-grained nanocrystal demonstrates only an 8% decrease in Pt utilization, a 5% power loss, and a 13 mV voltage drop, surpassing U.S. Department of Energy (DOE) durability targets. This study underscores the critical role of the atomically ordered Ni3Pt5 phase in stabilizing multi-grained NiPt nanocrystals, enhancing both durability and catalytic activity. These findings establish Ni3Pt5 embedded nanocatalysts as promising candidate for next-generation PEMFC applications, addressing key challenges in long-term operation. English WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Suppressing Metal Dissolution in Multi-Grained Catalysts Through Intragrain Atomic Ordering for Stable Fuel Cells Article 10.1002/adma.202504059 1 Advanced Materials, v.37, no.35 Advanced Materials 37 35 N scie scopus 001481718600001 2-s2.0-105004343909 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article OXYGEN REDUCTION HOLLOW NANOPARTICLES STRAIN DEGRADATION PERFORMANCE ULTRASOUND GENERATION INTERFACE STABILITY atomic ordering long-term durability oxygen reduction reaction (ORR) proton exchange membrane fuel cell (PEMFC) transition metal dissolution