Hydrogen-Induced Step-Edge Roughening of Platinum Electrode Surfaces | Zendy

Ian T. McCrum | Zendy; Christoph J. Bondue | Zendy; Marc T. M. Koper | Zendy

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Hydrogen-Induced Step-Edge Roughening of Platinum Electrode Surfaces

Author(s) -

Ian T. McCrum,

Christoph J. Bondue,

Marc T. M. Koper

Publication year - 2019

Publication title -

the journal of physical chemistry letters

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 2.563

H-Index - 203

ISSN - 1948-7185

DOI - 10.1021/acs.jpclett.9b02544

Subject(s) - platinum , catalysis , electrode , hydrogen , adsorption , chemical physics , density functional theory , reversible hydrogen electrode , materials science , standard hydrogen electrode , inorganic chemistry , chemistry , chemical engineering , electrochemistry , nanotechnology , computational chemistry , working electrode , organic chemistry , engineering

Electrode surfaces may change their surface structure as a result of the adsorption of chemical species, impacting their catalytic activity. Using density functional theory, we find that the strong adsorption of hydrogen at low electrode potentials promotes the thermodynamics and kinetics of a unique type of roughening of 110-type Pt step edges. This change in surface structure causes the appearance of the so-called "third hydrogen peak" in voltammograms measured on Pt electrodes, an observation that has eluded explanation for over 50 years. Understanding this roughening process is important for structure-sensitive (electro)catalysis and the development of active and stable catalysts.

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