Diabatic model for electrochemical hydrogen evolution based on constrained DFT configuration interaction

Nico Holmberg, Kari Laasonen

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)
253 Downloads (Pure)


The accuracy of density functional theory (DFT) based kinetic models for electrocatalysis is diminished by spurious electron delocalization effects, which manifest as uncertainties in the predicted values of reaction and activation energies. In this work, we present a constrained DFT (CDFT) approach to alleviate overdelocalization effects in the Volmer-Heyrovsky mechanism of the hydrogen evolution reaction (HER). This method is applied a posteriori to configurations sampled along a reaction path to correct their relative stabilities. Concretely, the first step of this approach involves describing the reaction in terms of a set of diabatic states that are constructed by imposing suitable density constraints on the system. Refined reaction energy profiles are then recovered by performing a configuration interaction (CDFT-CI) calculation within the basis spanned by the diabatic states. After a careful validation of the proposed method, we examined HER catalysis on open-ended carbon nanotubes and discovered that CDFT-CI increased activation energies and decreased reaction energies relative to DFT predictions. We believe that a similar approach could also be adopted to treat overdelocalization effects in other electrocatalytic proton-coupled electron transfer reactions, e.g., in the oxygen reduction reaction.
Original languageEnglish
Article number104702
Number of pages15
JournalJournal of Chemical Physics
Issue number10
Publication statusPublished - 11 Sep 2018
MoE publication typeA1 Journal article-refereed


Dive into the research topics of 'Diabatic model for electrochemical hydrogen evolution based on constrained DFT configuration interaction'. Together they form a unique fingerprint.

Cite this