[2A06-13] Surface Science / Chemical Property (SS2)

4:45 PM - 5:00 PM JST(7:45 AM - 8:00 AM UTC)

[2A12] In-situ spectroscopic study on the role of co-existing H₂O in CO₂ activation over Cu surfaces

*Yuki Tsujikawa¹, Go Okawara², Akitsugu Fujii², Tadayuki Yamasaki², Hiroshi Kondoh^1,2 (1. Faculty of Science and Technology, Keio University (Japan), 2. Graduate School of Science and Technology, Keio University (Japan))

Efficient CO₂ conversion is vital for a carbon-recycling society. Although CO₂ reduction over Cu is key, where C-O bond cleavage is rate-limiting, the impact of co-existing H2O remains unclear. We investigated H₂O effects on CO₂ activation over Cu(111) and stepped Cu(1,1,13) surfaces using PM-IRRAS and APXPS. Co-exposing Cu(111) to CO₂ and H₂O induced a unique PM-IRRAS peak at 2180 cm^-1, which was completely absent under single-gas exposure. APXPS confirmed that H₂O co-exposure explicitly grows new O 1s and C 1s peaks assigned to adsorbed CO, atomic O, and carbonate etc, proving that H₂O drastically promotes CO₂ dissociation. To probe the structural origin of this high-wavenumber CO, reference PM-IRRAS was performed on Cu(1,1,13) under CO. The terrace atop-CO peak decreased while the 2190 cm^-1 peak grew over time, mirroring Cu(111). Given that adsorbed CO is known to drive restructuring on Cu surfaces, the correlation between the high-wavenumber CO and Cu clusters are under consideration.

Password required to view