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Scaling Platinum‐Catalyzed Hydrogen Dissociation on Corrugated Surfaces
Author(s) -
Auras Sabine V.,
Lent Richard,
Bashlakov Dima,
Piñeiros Bastidas Jessika M.,
Roorda Tycho,
Spierenburg Rick,
Juurlink Ludo B. F.
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202005616
Subject(s) - dissociation (chemistry) , chemistry , reactivity (psychology) , catalysis , platinum , hydrogen , molecule , crystallography , chemical physics , density functional theory , computational chemistry , organic chemistry , pathology , medicine , alternative medicine
We determine absolute reactivities for dissociation at low coordinated Pt sites. Two curved Pt(111) single‐crystal surfaces allow us to probe either straight or highly kinked step edges with molecules impinging at a low impact energy. A model extracts the average reactivity of inner and outer kink atoms, which is compared to the reactivity of straight A‐ and B‐type steps. Local surface coordination numbers do not adequately capture reactivity trends for H 2 dissociation. We utilize the increase of reactivity with step density to determine the area over which a step causes increased dissociation. This step‐type specific reactive area extends beyond the step edge onto the (111) terrace. It defines the reaction cross‐section for H 2 dissociation at the step, bypassing assumptions about contributions of individual types of surface atoms. Our results stress the non‐local nature of H 2 interaction with a surface and provide insight into reactivity differences for nearly identical step sites.