Hwang, Chang-Kyu Kim, Jong Min Hwang, Sehoon Kim, Joo-Hyung Sung, Chang Hyun Moon, Byung-Moo Chae, Keun Hwa Singh, Jitendra Pal Kim, Seung-Hoon Jang, Seung Soon Lee, Seung Woo Ham, Hyung Chul Han, Seunghee Kim, Jin Young 2024-01-19T18:32:04Z 2024-01-19T18:32:04Z 2021-09-04 2020-01 2196-7350 https://pubs.kist.re.kr/handle/201004/119169 The exploitation of state-of-the-art Pt/C electrocatalysts for polymer electrolyte membrane fuel cells (PEMFCs) is mostly limited, due to high Pt loading and durability issues caused by electrochemical instability of the carbon support in high potential regimes. In this study, the authors report that high-compressive 3D Pt nanostructured thin films can considerably increase the catalytic activity and electrochemical durability of electrocatalysts under PEMFC device operating conditions. The nanostructure fabrication relies on the dealloying or selective leaching of solid alloys of Pt-C binary film to produce a residual 3D nanoporous thin-film structure. A very rich structural behavior from the dealloying is shown, in which stress relief plays a governing role; the films possess a 3D structure of randomly interpenetrating ligaments and hierarchical pores with sizes between less than 50 nm and several tens of micrometers. In addition, a significant change is observed in the average lattice constant (1.55% compressive strain), which can tune the structural and electronic states of catalytic sites for enhancing the activity of the Pt electrocatalysts. Electrochemical performance of the fabricated porous strained Pt thin-film electrocatalysts in both half-cell and single-cell analyses has demonstrated activity and durability superior to benchmark carbon support Pt catalysts. English John Wiley and Sons Ltd Porous Strained Pt Nanostructured Thin-Film Electrocatalysts via Dealloying for PEM Fuel Cells Article 10.1002/admi.201901326 1 Advanced Materials Interfaces, v.7, no.2 Advanced Materials Interfaces 7 2 N scie scopus 000501775700001 2-s2.0-85076374704 Chemistry, Multidisciplinary Materials Science, Multidisciplinary Chemistry Materials Science Article OXYGEN REDUCTION REACTION DESIGN 3D Pt nanostructured thin films compressive strains dealloying oxygen reduction reaction polymer electrolyte membrane fuel cells