Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany and Department Functional Interfaces, Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Strasse 9, 07745 Jena, Germany.
Institute of Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany.
Chem Commun (Camb). 2020 Sep 10;56(72):10485-10488. doi: 10.1039/d0cc04509h.
Understanding the limitations of catalytic processes enables the design of optimized catalysts. Here, femtosecond transient absorption spectroelectrochemistry is used to explore the photophysics of polyoxometalate-based covalent photosensitizer-hydrogen evolution catalyst dyads. The study shows that the presence of light-driven forward and backward electron transfer, i.e. "electron ping-pong", is a limiting factor for charge accumulation on the polyoxometalate. Based on this insight, chemical means of optimizing catalyst performance are proposed.
了解催化过程的局限性可以使我们设计出优化的催化剂。在这里，飞秒瞬态吸收光谱电化学被用来探索基于多金属氧酸盐的共价光催化剂-析氢催化剂偶联物的光物理。该研究表明，光驱动的正向和反向电子转移的存在，即“电子乒乓”，是在多金属氧酸盐上积累电荷的限制因素。基于这一认识，提出了优化催化剂性能的化学方法。
