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Keywords:

  • hydrogen evolution reaction;
  • semiconductor electrodes;
  • molecular catalysts;
  • platinum complexes;
  • X-ray absorption fine structure
Thumbnail image of graphical abstract

Two examples of confined molecular catalysts are presented. PtCl42− complexes are attached to a thiol-terminated monolayer by ligand exchange of Cl with a thiolate group and incorporated in a multilayer of viologen moieties by ion exchange. All Cl ligands are replaced by OH or H2O before HER takes place. Ex situ and in situ XAFS measurements confirm that the Pt complexes accelerate HER without being converted into Pt particles.