Journal Article

PUBDB-2022-07815

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Light-induced agglomeration of single‐atom platinum in photocatalysis

Denisov, N. ; Qin, S. ; Will, J.Extern* ; Vasiljevic, B. N. ; Skorodumova, N. V. ; Pašti, I. A. ; Sarma, B. B.Extern* ; Osuagwu, B. ; Yokosawa, T. ; Voss, J. ; Wirth, J. ; Spiecker, E. ; Schmuki, P. (Corresponding author)Extern*

2023
Wiley-VCH Weinheim

This record in other databases:        

Please use a persistent id in citations: doi:10.1002/adma.202206569  doi:10.3204/PUBDB-2022-07815

Abstract: With recent advances in the field of single-atoms (SAs) used in photocatalysis, an unprecedented performance of atomically dispersed co-catalysts has been achieved. However, the stability and agglomeration of SA co-catalysts on the semiconductor surface may represent a critical issue in potential applications. Here we describe the photoinduced destabilization of Pt SAs on the benchmark photocatalyst, TiO2. In aqueous solutions within illumination timescales ranging from few minutes to several hours, light-induced agglomeration of Pt SAs to ensembles (dimers, multimers) and finally nanoparticles takes place. The kinetics critically depends on the presence of sacrificial hole scavengers and the used light intensity. DFT calculations attribute the light induced destabilization of the SA Pt species to binding of surface-coordinated Pt with solution-hydrogen (adsorbed H atoms), which consequently weakens the Pt SA bonding to the TiO2 surface. Despite the gradual aggregation of Pt SAs into surface clusters and their overall reduction to metallic state, which involves >90% of Pt SAs, the overall photocatalytic H2 evolution remains virtually unaffected.

---

Contributing Institute(s):

1. FS-Photon Science (FS-PS)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P65 (PETRA III)

Appears in the scientific report 2022

---

Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Essential Science Indicators ; IF >= 25 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---