Ferroelectric triggering of carbon monoxide adsorption on lead zirco-titanate (001) surfaces

• DOI: 10.1038/srep35301
• Publication Date: 2016-10-14T10:23:08Z
• Authors: Liviu Cristian Tă...; Nicoleta Georgian...; Laura Elena Abramiuc; Cristian Alexandr...; Luminița Hrib; Lucian Trupină; Lucian Pintilie; Cristian Mihail T...
• Keywords: 13. Climate action; Ferroelectrics; carbon monoxide; x-ray photoelectron spectroscopy; x-ray photoelectron spectroscopy; 01 natural sciences; carbon monoxide; Article; Ferroelectric; 0104 chemical sciences

Abstract Atomically clean lead zirco-titanate PbZr 0.2 Ti 0.8 O 3 (001) layers exhibit a polarization oriented inwards P (−) , visible by band bending of all core levels towards lower binding energies, whereas as introduced (+) under air or in ultrahigh vacuum. The magnitude the decreases when temperature is increased at 700 K. CO adsorption on polarized surfaces saturates about one quarter monolayer carbon, and occurs both molecular (oxidized) dissociated (reduced) states with large majority reduced state. sticking surface vacuum found to be directly related state surface. A simple electrostatic mechanism proposed explain these dissociation processes carbon areas. Carbon desorbs also irradiated soft X-rays. desorption lost proceeds most probably form 2 . Upon cycles, ferroelectric depleted oxygen some point reverses its polarization, owing electrons provided vacancies which are able screen depolarization field produced positive fixed charges