Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter. Our current focus is on detection and sensing/imaging with an emphasis on the development of integrated photonics. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.

 

New photophysics of hydrogen generating Ru-Pt photocatalysts


  • Qing Pan - Former member
  • Annemarie Huijser - Former member


  • Knowledge of the ultrafast photodynamics that are induced by photoexcitation are of prime importance for the realization of supramolecular assembly designs for solar hydrogen generation. As a continuation of our project on Ru-Pd photocatalysts, we are now focusing on the photophysics of two new Ru-Pt photocatalysts, which are shown in Figure 1.

    fig1
    Figure 1. Molecular structure of [Ru(bpy)2tpyPt(CH3CN)I]2+ (left, RuPt) and [Ru(dceb)2tpyPt(CH3CN)I]2+ (right, EtRuPt).

    Both RuPt and EtRuPt are active for hydrogen generation, with the latter behaving much more efficient than the former. On basis of ultrafast transient absorption (TA, data of RuPt in Figure 2) and density functional theory calculations, we explain this effect in terms of directionality of inter-ligand internal conversion and long-lived excited states.

    fig2
    Figure 2. TA spectra of RuPt, the fits are represented as solid curves.

    Collaborations: Prof. Han Vos, Dublin City University


    Articles

    The following articles have been published regarding this project:

    Peripheral ligands as electron storage reservoirs and their role in enhancement of photocatalytic hydrogen generation

    (abstract) (full pdf)
    Qing Pan, Leon Freitag, Tanja Kowacs, Jane C. Falgenhauer, Jeroen P. Korterik, Derck Schlettwein, Wesley R. Browne, Mary T. Pryce, Sven Rau, Leticia González, Johannes G. Vos and Annemarie Huijser
    Chemical Communications
    june 27, 2016 vol. 52, p.9371-9374
    doi:10.1039/C6CC05222C

    The critical role played by the catalytic moiety in the early-time photodynamics of hydrogen generating bimetallic photocatalysts

    (abstract) (full pdf)
    Qing Pan, Francesco Mecozzi, Jeroen P. Korterik, Johannes G. Vos, Wesley R. Browne, Annemarie Huijser
    ChemPhysChem
    10.1002/cphc.201600458 accepted june 3, 2016
    doi:10.1002/cphc.201600458