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Photocatalytic Hydrogen Evolution From Self-Assembled Stacks of Pd-TCPP and Pt-TCPP.

Jihyeon Kim¹, Lukas Zdrazil^2,3, Xin Zhou¹

¹Department of Materials Science WW4-LKO, Friedrich-Alexander-University of Erlangen-Nuremberg, Erlangen, Germany.

Small (Weinheim an Der Bergstrasse, Germany)

|June 18, 2026

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Surfactant-free palladium (Pd) and platinum (Pt) TCPP nanorods were synthesized for photocatalytic hydrogen (H2) evolution. Pd-TCPP nanorods show superior performance without co-catalysts, outperforming other platforms.

Area of Science:

Supramolecular chemistry
Photocatalysis
Materials science

Background:

Metal-organic coordination compounds like TCPPs are explored for photocatalysis.
Achieving efficient hydrogen evolution often requires co-catalysts and complex synthesis.

Purpose of the Study:

To develop a simple, co-catalyst-free method for synthesizing active photocatalysts.
To investigate the structure-property relationships of Pd- and Pt-TCPP nanorods for H2 evolution.

Main Methods:

Surfactant-free precipitation of Pd- and Pt-TCPP in MeOH/H2O.
Characterization using XRD, spectroscopy, and electrochemistry.
Photocatalytic activity testing for H2 evolution.

Main Results:

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Pd- and Pt-TCPP formed µm-long nanorods with J-type π-π stacking.
Co-catalyst-free Pd-TCPP and Pt-TCPP nanorods exhibited intrinsic H2 evolution activity.
Pd-TCPP nanorods outperformed Pt-TCPP and other state-of-the-art photocatalysts.
Tighter π-π stacking and longer triplet lifetimes in Pd-TCPP correlated with enhanced performance.

Conclusions:

Surfactant-free synthesis yields efficient, co-catalyst-free photocatalysts.
Pd-TCPP nanorods offer a promising platform for sustainable H2 production.
Understanding supramolecular assembly is key to optimizing photocatalytic activity.