Kim, Jong Min Jo, Ahrae Lee, Kyung Ah Han, Hyeuk Jin Kim, Ye Ji Kim, Ho Young Lee, Gyu Rac Kim, Minjoon Park, Yemin Kang, Yun Sik Jung, Juhae Chae, Keun Hwa Lee, Eoyoon Ham, Hyung Chul Ju, Hyunchul Jung, Yeon Sik Kim, Jin Young 2024-01-19T14:30:27Z 2024-01-19T14:30:27Z 2021-10-21 2021-07 2375-2548 https://pubs.kist.re.kr/handle/201004/116791 Unsupported Pt electrocatalysts demonstrate excellent electrochemical stability when used in polymer electrolyte membrane fuel cells; however, their extreme thinness and low porosity result in insufficient surface area and high mass transfer resistance. Here, we introduce three-dimensionally (3D) customized, multiscale Pt nanoarchitectures (PtNAs) composed of dense and narrow (for sufficient active sites) and sparse (for improved mass transfer) nanoscale building blocks. The 3D-multiscale PtNA fabricated by ultrahigh-resolution nanotransfer printing exhibited excellent performance (45% enhanced maximum power density) and high durability (only 5% loss of surface area for 5000 cycles) compared to commercial Pt/C. We also theoretically elucidate the relationship between the 3D structures and cell performance using computational fluid dynamics. We expect that the structure-controlled 3D electrocatalysts will introduce a new pathway to design and fabricate high-performance electrocatalysts for fuel cells, as well as various electrochemical devices that require the precision engineering of reaction surfaces and mass transfer. English AMER ASSOC ADVANCEMENT SCIENCE Conformation-modulated three-dimensional electrocatalysts for high-performance fuel cell electrodes Article 10.1126/sciadv.abe9083 1 SCIENCE ADVANCES, v.7, no.30 SCIENCE ADVANCES 7 30 N scie scopus 000675849000007 2-s2.0-85110277653 Multidisciplinary Sciences Science & Technology - Other Topics Article OXYGEN REDUCTION REACTION THIN-FILMS PHASE CHALLENGES OPERATION CATALYSTS MODEL 3D Pt architecture oxygen reduction reaction nanotransfer printing fuel cell electrocatalyst