title: Self-Supported Mesostructured Pt-Based Bimetallic Nanospheres Containing an Intermetallic Phase as Ultrastable Oxygen Reduction Electrocatalysts.
abstract: Developing highly active and stable cathode catalysts is of pivotal importance for proton exchange membrane fuel cells (PEMFCs). While carbon-supported nanostructured Pt-based catalysts have so far been the most active cathode catalysts, their durability and single-cell performance are yet to be improved. Herein, self-supported mesostructured Pt-based bimetallic (Meso-PtM; M = Ni, Fe, Co, Cu) nanospheres containing an intermetallic phase are reported, which can combine the beneficial effects of transition metals (M), an intermetallic phase, a 3D interconnected framework, and a mesoporous structure. Meso-PtM nanospheres show enhanced oxygen reduction reaction (ORR) activity, compared to Pt black and Pt/C catalysts. Notably, Meso-PtNi containing an intermetallic phase exhibits ultrahigh stability, showing enhanced ORR activity even after 50 000 potential cycles, whereas Pt black and Pt/C undergo dramatic degradation. Importantly, Meso-PtNi with an intermetallic phase also demonstrated superior activity and durability when used in a PEMFC single-cell, with record-high initial mass and specific activities.
authors: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea.
authors: Ho Young
authors: HY
authors: Kim
authors: Fuel Cell Laboratory, Korea Institute of Energy Research (KIER), 152 Gajeong-ro, Daejeon, 34129, Republic of Korea.|University of Science and Technology (UST), 217 Gajeong-ro, Daejeon, 34113, Republic of Korea.
authors: Seonghun
authors: S
authors: Cho
authors: Department of Chemistry, UNIST, 50 UNIST-gil, Ulsan, 44919, Republic of Korea.
authors: Young Jin
authors: YJ
authors: Sa
authors: Fuel Cell Laboratory, Korea Institute of Energy Research (KIER), 152 Gajeong-ro, Daejeon, 34129, Republic of Korea.
authors: Sun-Mi
authors: SM
authors: Hwang
authors: Fuel Cell Laboratory, Korea Institute of Energy Research (KIER), 152 Gajeong-ro, Daejeon, 34129, Republic of Korea.|University of Science and Technology (UST), 217 Gajeong-ro, Daejeon, 34113, Republic of Korea.
authors: Gu-Gon
authors: GG
authors: Park
authors: UNIST Central Research Facility (UCRF), UNIST, 50 UNIST-gil, Ulsan, 44919, Republic of Korea.
authors: Tae Joo
authors: TJ
authors: Shin
authors: UNIST Central Research Facility (UCRF), UNIST, 50 UNIST-gil, Ulsan, 44919, Republic of Korea.
authors: Hu Young
authors: HY
authors: Jeong
authors: Fuel Cell Laboratory, Korea Institute of Energy Research (KIER), 152 Gajeong-ro, Daejeon, 34129, Republic of Korea. jimmyim@kier.re.kr.|University of Science and Technology (UST), 217 Gajeong-ro, Daejeon, 34113, Republic of Korea. jimmyim@kier.re.kr.
authors: Sung-Dae
authors: SD
authors: Yim
authors: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea. shjoo@unist.ac.kr.|Department of Chemistry, UNIST, 50 UNIST-gil, Ulsan, 44919, Republic of Korea. shjoo@unist.ac.kr.
authors: Sang Hoon
authors: SH
authors: Joo
keywords: durability; electrocatalysts; fuel cells; intermetallic; platinum