Light‐induced agglomeration of single‐atom platinum in photocatalysis

Denisov N, Qin S, Will J, Vasiljevic BN, Skorodumova NV, Pašti IA, Sarma BB, Osuagwu B, Yokosawa T, Voß J, Wirth J, Spiecker E, Schmuki P (2022)

Publication Type: Journal article

Publication year: 2022


Original Authors: 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

Pages Range: 2206569

DOI: 10.1002/adma.202206569


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.

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Denisov, N., Qin, S., Will, J., Vasiljevic, B.N., Skorodumova, N.V., Pašti, I.A.,... Schmuki, P. (2022). Light‐induced agglomeration of single‐atom platinum in photocatalysis. Advanced Materials, 2206569.


Denisov, Nikita, et al. "Light‐induced agglomeration of single‐atom platinum in photocatalysis." Advanced Materials (2022): 2206569.

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