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A Universal Approach To Determine the Free Energy Diagram of an Electrocatalytic Reaction

Exner, Kai S., Sohrabnejad-Eskan, Iman, Over, Herbert·2018·ACS Catalysis

Abstract

Extended Tafel plots at various temperatures for an electrocatalyzed reaction and (possibly) its reversed reaction on single-crystalline model electrodes allow for constructing the (essential part of the) free energy surface, in particular the free energies of the transition states (TS). Free energies of the reaction intermediates (RIs) including the chemical nature of active surface sites (S) are hardly accessible to experiment and need therefore to be taken from constrained ab initio thermodynamics calculations. The compact compilation of experimental kinetic data in the form of a free energy diagram enables a critical assessment and validation of theoretical free energy landscapes based on first-principles kinetics. For three prototypical electrocatalyzed reactions, namely the chlorine evolution reaction (CER) and oxygen evolution reaction (OER) over RuO 2 (110) as well as hydrogen evolution reaction (HER) on Pt(111), we exemplify this universal approach and discuss potential benefits for theoretical modeling of electrocatalyzed reaction.

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Metadata

Authors
Exner, K. S., Sohrabnejad-Eskan, I., & Over, H.
Venue
ACS Catalysis
Published
2018-01-31
Volume
8
Issue
3
Pages
1864-1879
ISSN
2155-5435 (ISSN-L)
OpenAlex
W2783709669
Cited by
184
References
5
FWCI
4.30
Type
journal article
Language
en
Open access
closed

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