Atomic-scale surface morphology controls formate stability on Ag-Pd alloys

Creative Commons License

Karatok M.

APPLIED SURFACE SCIENCE, 2025 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1016/j.apsusc.2025.163013
  • Dergi Adı: APPLIED SURFACE SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
  • Hacettepe Üniversitesi Adresli: Evet

Özet

The ability to control reaction intermediates on catalytic surfaces plays a crucial role in driving chemical transformations toward desired products. This study explores how atomic-scale surface morphology influences the thermal stability of formate, a key intermediate in the conversions between CO2 and C-1 fuels, using Ag/Pd (111) model systems. The binding strength of formate is significantly affected by the morphology of Ag-Pd alloy catalysts. Two- and three-dimensional Ag islands of various sizes were fabricated on a Pd(111) single crystal via Ag deposition. Temperature-programmed reaction spectroscopy (TPRS) revealed that 2D-Ag islands increased the thermal stability of formate by up to approximately 30 kJ/mol compared to pristine Pd(111), depending on their size, while 3D-Ag islands provided an additional stabilization of similar to 20 kJ/mol. These findings demonstrate that the binding strength of formate on Ag-Pd alloy catalysts can be finely adjusted by tailoring the surface morphology at the atomic-scale, enabling more selective and controlled chemical reactions.