Mechanism and Micro Kinetic Model for Electroreduction of CO2on Pd/C: The Role of Different Palladium Hydride Phases

Martijn J.W. Blom, Wim P.M. van Swaaij, Guido Mul, Sascha R.A. Kersten*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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We measured the reaction kinetics of the electrochemical reduction of CO2to formate on Pd/C and evaluated several proposed mechanisms, by comparing model-described and observed rates of formation of HCOO-and H2as a function of several parameters (pH2,pCO2, and potential). An α-/β-hydride mechanism, based on an α-hydride phase active for CO2reduction and a β-hydride Pd-phase active for hydrogen evolution, described the experimental data of our and other laboratories reported in the literature satisfactorily. After parametrization, using a data set including only H2, this mechanism also predicted the outcome of D2isotope labeling experiments correctly. Analyses of the results indicate that the α-/β-hydride ratio and hydride formation rate are key factors affecting the formate production rate and the selectivity, thereby identifying areas for further (spectroscopic) studies and mechanism validation.

Original languageEnglish
Pages (from-to)6883-6891
Number of pages9
JournalACS catalysis
Issue number12
Publication statusPublished - 18 Jun 2021


  • CO2 reduction
  • electrochemistry
  • formate
  • mechanism
  • micro kinetic model
  • palladium
  • UT-Hybrid-D

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