Work

Dissociation Dynamics of CO 2 on Cu(110) Studied over a Wide Range of Incident Energies

Year: 2024

Type: article

Abstract: In this work, we have studied the dissociation dynamics of CO2 on a Cu(110) surface using molecular beams with incidence energies ranging from 0.28 eV to 4.6 eV. The incident energy dependence of the initial dissociative reaction probabilities (S0) of CO2 showed two distinct characteristics. S0 exhibits a rapid increase from 1.18 × 10−4 at 0.28 eV to over 200-fold at 2 eV. Beyond this, only a small increase by a factor of 2 was observed in the 2 eV to 4.6 eV range, with S0 being only 4.1 × 10−2 at 4.6 eV. Incident angle-dependent measurements reveal total energy scaling to be followed. Measurements using a heated nozzle showed no observable enhancement in S0 due to the vibrational energy of the incident molecules, with an upper limit of vibrational efficacy estimated to be 0.25. Furthermore, an increase in O-atom saturation coverage (resulting from CO2 dissociation) from 0.5 ML to 0.66 ML was observed at high impact energies (> 3 eV), suggesting that newer dissociation sites become accessible at higher energies.

Source: The Journal of Physical Chemistry C

DOI: 10.1021/acs.jpcc.4c05642

Authors: Saurabh Kumar Singh, Pranav R. Shirhatti

Institution: Tata Institute of Fundamental Research

Language: English

Topic: Surface Chemistry and Catalysis

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funders: Department of Atomic Energy, Government of India, Science and Engineering Research Board

Awards: G3422166442, G516658781