Tailoring ruthenium exposure to enhance the performance of fcc platinum@ruthenium core-shell electrocatalysts in the oxygen evolution reaction.

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Physical chemistry chemical physics : PCCP, ISSN: 1463-9084, Vol: 18, Issue: 24, Page: 16169-78

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AlYami, Noktan M; LaGrow, Alec P; Joya, Khurram S; Hwang, Jinyeon; Katsiev, Khabiboulakh; Anjum, Dalaver H; Losovyj, Yaroslav; Sinatra, Lutfan; Kim, Jin Young; Bakr, Osman M
Royal Society of Chemistry (RSC); The Royal Society of Chemistry
Physics and Astronomy; Chemistry
article description
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.