Light‐Induced Agglomeration of Single‐Atom Platinum in Photocatalysis

Nikita Denisov; Shanshan Qin; Johannes Will; Bojana Nedić Vasiljevic; Natalia V. Skorodumova; Igor A. Pašti; Bidyut Bikash Sarma; Benedict Osuagwu; Tadahiro Yokosawa; Johannes Voss; Janis Wirth; Erdmann Spiecker; Patrik Schmuki

doi:10.1002/adma.202206569

journal article·2023-02Open access

Light‐Induced Agglomeration of Single‐Atom Platinum in Photocatalysis

Nikita Denisov, Shanshan Qin, Johannes Will, Bojana Nedić Vasiljevic, Natalia V. Skorodumova, Igor A. Pašti, Bidyut Bikash Sarma, Benedict Osuagwu, Tadahiro Yokosawa, Johannes Voss, Janis Wirth, Erdmann Spiecker, Patrik Schmuki

Advanced Materials· Volume 35· Issue 5

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Source abstract

Abstract

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, the photoinduced destabilization of Pt SAs on the benchmark photocatalyst, TiO₂, is described. 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. Density‐functional theory 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.

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Research context

Nanomaterials Electronic materials Catalysis & surfaces

OpenAlex topics: Advanced Photocatalysis Techniques · Catalytic Processes in Materials Science · Electrocatalysts for Energy Conversion

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering Chair for Surface Science and Corrosion (WW4‐LKO) Friedrich‐Alexander‐Universität Erlangen‐Nürnberg Martensstrasse 7 91058 Erlangen Germany

Institute of Micro‐ and Nanostructure Research & Center for Nanoanalysis and Electron Microscopy (CENEM) IZNF Friedrich‐Alexander‐Universität Erlangen‐Nürnberg Cauerstraße 3 91058 Erlangen Germany

Faculty of Physical Chemistry University of Belgrade Studentski trg 12‐16 Belgrade 11000 Serbia

Department of Materials Science and Engineering School of Industrial Engineering and Management KTH‐Royal Institute of Technology Brinellvägen 23 Stockholm 10044 Sweden

Institute of Catalysis Research and Technology and Institute for Chemical Technology and Polymer Chemistry Karlsruhe Institute of Technology 76131 Karlsruhe Germany

Regional Centre of Advanced Technologies and Materials Šlechtitelů 27 Olomouc 78371 Czech Republic

Department of Chemistry Faculty of Science King Abdulaziz University P.O. Box 80203 Jeddah 21569 Saudi Arabia

Funding

Deutsche Forschungsgemeinschaft · European Regional Development Fund · Science Fund of the Republic of Serbia · Vetenskapsrådet

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