title: Tailoring ruthenium exposure to enhance the performance of fcc platinum@ruthenium core-shell electrocatalysts in the oxygen evolution reaction.
abstract: The catalytic properties of noble metal nanocrystals are a function of their size, structure, and surface composition. In particular, achieving high activity without sacrificing stability is essential for designing commercially viable catalysts. A major challenge in designing state-of-the-art Ru-based catalysts for the oxygen evolution reaction (OER), which is a key step in water splitting, is the poor stability and surface tailorability of these catalysts. In this study, we designed rapidly synthesizable size-controlled, morphology-selective, and surface-tailored platinum-ruthenium core-shell (Pt@Ru) and alloy (PtRu) nanocatalysts in a scalable continuous-flow reactor. These core-shell nanoparticles with atomically precise shells were produced in a single synthetic step with carbon monoxide as the reducing agent. By varying the metal precursor concentration, a dendritic or layer-by-layer ruthenium shell can be grown. The synthesized Pt@Ru and PtRu nanoparticles exhibit noticeably higher electrocatalytic activity in the OER compared to that of pure Pt and Ru nanoparticles. Promisingly, Pt@Ru nanocrystals with a ∼2-3 atomic layer Ru cuboctahedral shell surpass conventional Ru nanoparticles in terms of both durability and activity.
authors.affiliation: Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia. Osman.bakr@kaust.edu.sa.
authors.forename: Noktan M
authors.initials: NM
authors.lastname: AlYami
authors.forename: Alec P
authors.initials: AP
authors.lastname: LaGrow
authors.forename: Khurram S
authors.initials: KS
authors.lastname: Joya
authors.forename: Jinyeon
authors.initials: J
authors.lastname: Hwang
authors.forename: Khabiboulakh
authors.initials: K
authors.lastname: Katsiev
authors.forename: Dalaver H
authors.initials: DH
authors.lastname: Anjum
authors.forename: Yaroslav
authors.initials: Y
authors.lastname: Losovyj
authors.forename: Lutfan
authors.initials: L
authors.lastname: Sinatra
authors.forename: Jin Young
authors.initials: JY
authors.lastname: Kim
authors.forename: Osman M
authors.initials: OM
authors.lastname: Bakr