Tailoring Ruthenium Exposure to Enhance the Performance of fcc Platinum@Ruthenium Core-Shell Electrocatalysts in the Oxygen Evolution Reaction
AuthorsAlYami, Noktan Mohammed
LaGrow, Alec P.
Anjum, Dalaver H.
Kim, Jin Young
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
KAUST Solar Center (KSC)
Imaging and Characterization Core Lab
Permanent link to this recordhttp://hdl.handle.net/10754/611215
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AbstractThe 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 catalytic activities of 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.
CitationTailoring Ruthenium Exposure to Enhance the Performance of fcc Platinum@Ruthenium Core-Shell Electrocatalysts in the Oxygen Evolution Reaction 2016 Phys. Chem. Chem. Phys.
SponsorsAuthor Contributions: All of the authors approved the final version of the manuscript. N.M.A. designed the synthetic procedure. N.M.A. performed the TEM and XRD. N.M.A., A.P.L. and D.H.A. conducted the STEM and STEM-EDS mapping. Y.L. and Kh.K. performed XPS. N.M.A. and A.P.L. hypothesized the growth mechanism. N.M.A., K.S.J., J.H., L.S. and J.Y.K. executed the electrochemical measurements and analysis. N.M.A. wrote the manuscript and carried out the analyses. All authors contributed to the discussion and interpretation of the results. We thank Prof. Kazuhiro Takanabe for the use of his lab to conduct the electrochemical experiments. Access to XPS at the Nanoscale Characterization Facility at IU-B Chemistry was provided by NSF Award DMR MRI-1126394.
PublisherRoyal Society of Chemistry (RSC)
JournalPhys. Chem. Chem. Phys.
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