title: Modification of N-doped TiO2photocatalysts using noble metals (Pt, Pd) - a combined XPS and DFT study.
abstract: Nitrogen-doped TiO2(N-TiO2) is considered as one of the most promising materials for various photocatalytic applications, while noble metals Pd and Pt are known as good catalysts for hydrogen evolution. This work focuses on the determination of structural and electronic modifications of N-TiO2, achieved by noble metal deposition at the surface, as a starting indicator for potential applications. We focus on the properties of easily synthesized nanocrystalline nitrogen-doped anatase TiO2, modified by depositing small amounts of Pd (0.05 wt%) and Pt (0.10 wt%), aiming to demonstrate efficient enhancement of optical properties. The chemical states of dopants are studied in detail, using X-ray photoemission spectroscopy, to address the potential of N-TiO2to act as a support for metallic nanoparticles. DFT calculations are used to resolve substitutional from interstitial nitrogen doping of anatase TiO2, as well as to study the combined effect of nitrogen doping and oxygen vacancy formation. Based on the binding energies calculated using Slater's transition state theory, dominant contribution to the N 1s binding energy at 399.8 eV is ascribed to interstitially doped nitrogen in anatase TiO2. Given that both structure and photocatalytic properties depend greatly on the synthesis procedure, this work contributes further to establishing correlation between the structure and optical properties of the noble metal modified N-TiO2system.
authors.affiliation: Institute of Nuclear Sciences Vinča, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia. kciric@vin.bg.ac.rs.
authors.forename: K
authors.identifier: http://orcid.org/0000-0003-2027-5733
authors.initials: K
authors.lastname: Batalović
authors.affiliation: Institute of Nuclear Sciences Vinča, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia. kciric@vin.bg.ac.rs.
authors.forename: N
authors.initials: N
authors.lastname: Bundaleski
authors.affiliation: Institute of Nuclear Sciences Vinča, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia. kciric@vin.bg.ac.rs.
authors.forename: J
authors.initials: J
authors.lastname: Radaković
authors.affiliation: Institute of Nuclear Sciences Vinča, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia. kciric@vin.bg.ac.rs.
authors.forename: N
authors.initials: N
authors.lastname: Abazović
authors.affiliation: Institute of Nuclear Sciences Vinča, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia. kciric@vin.bg.ac.rs.
authors.forename: M
authors.initials: M
authors.lastname: Mitrić
authors.affiliation: LNEG, National Laboratory for Energy and Geology, Paço do Lumiar 22, 1649-038 Lisbon, Portugal.
authors.forename: R A
authors.initials: RA
authors.lastname: Silva
authors.affiliation: Institute of Nuclear Sciences Vinča, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia. kciric@vin.bg.ac.rs.
authors.forename: M
authors.initials: M
authors.lastname: Savić
authors.affiliation: Institute of Nuclear Sciences Vinča, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia. kciric@vin.bg.ac.rs.
authors.forename: J
authors.initials: J
authors.lastname: Belošević-Čavor
authors.affiliation: Institute of Nuclear Sciences Vinča, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia. kciric@vin.bg.ac.rs.
authors.forename: Z
authors.initials: Z
authors.lastname: Rakočević
authors.affiliation: LNEG, National Laboratory for Energy and Geology, Paço do Lumiar 22, 1649-038 Lisbon, Portugal.
authors.forename: C M
authors.initials: CM
authors.lastname: Rangel