The Nature of Hydrogen Adsorption on Platinum in the Aqueous Phase

Guoju Yang, Sneha A. Akhade, Xi Chen, Yue Liu, Mal Soon Lee, Vassiliki Alexandra Glezakou, Roger Rousseau, Johannes A. Lercher

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The thermodynamic state of H2 adsorbed on Pt in the aqueous phase was determined by kinetic analysis of H2 reacting with D2O to HDO, HD, and D2, and by DFT-based ab initio molecular dynamics simulations of H2 adsorption on Pt(111), Pt(110), and Pt nanoparticles. Dissociative adsorption of H2 on Pt is significantly weakened in the aqueous phase compared to adsorption at gas–solid interfaces. Water destabilizes the adsorbed H atoms, decreasing the heat of adsorption by 19–22 kJ (Formula presented.) while inducing an additional entropy loss of 50–70 J (Formula presented.) K−1. Upon dissociative adsorption of H2, the average distance of water from the Pt surface increases and the liquid adopts a structure that is more ordered than before close to the Pt surface, which limits the translation mobility of the adsorbed H atoms. The presence of hydrated hydronium ions next to the Pt surface further lowers the H−Pt bond strength.

Original languageEnglish
Pages (from-to)3527-3532
Number of pages6
JournalAngewandte Chemie - International Edition
Volume58
Issue number11
DOIs
Publication statusPublished - Mar 11 2019

Keywords

  • adsorption
  • hydrogen
  • hydrogen binding energy
  • platinum
  • water phase

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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