Site-specific reactivity of molecules with surface defects - the case of H2 dissociation on Pt

TitleSite-specific reactivity of molecules with surface defects - the case of H2 dissociation on Pt
Publication TypeJournal Article
Year of Publication2019
AuthorsR. van Lent, S.V Auras, K. Cao, A.J Walsh, A. Gleeson, L.BF Juurlink
JournalScience
Volume363
Issue6423
Pagination155-157
Date Published1/2019
Abstract

The classic system that describes weakly activated dissociation in heterogeneous catalysis has been explained by two dynamical models that are fundamentally at odds. Whereas one model for hydrogen dissociation on platinum(111) invokes a preequilibrium and diffusion toward defects, the other is based on direct and local reaction. We resolve this dispute by quantifying site-specific reactivity using a curved platinum single-crystal surface. Reactivity is step-type dependent and varies linearly with step density. Only the model that relies on localized dissociation is consistent with our results. Our approach provides absolute, site-specific reaction cross sections.

DOI10.1126/science.aau6716
Division

MaSF

Department

MSS

PID

cc73b26adfe46af69c2c7dd87de24dd1

Alternate TitleScience

Go back one page.