The paper of Prof. Ken Sakai was published in "Angewandte Chemie International Edition".

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The paper of Prof. Ken Sakai (Principal Investigator, Hydrogen Production Research Division, I2CNER) was published in online “Angewandte Chemie International Edition”.



In order to solve the problems of global warming and shortage of fossil fuels, researchers have been endeavoring to achieve artificial photosynthesis: splitting water into H2 and O2 under solar light illumination. Our group has recently invented a unique system that drives photoinduced water reduction through “Z-scheme” photosynthetic pathways. Nevertheless, that system still suffered from a low turnover number (TON) of the photocatalytic cycle (TON=4.1). We have now found and describe herein a new methodology to make significant improvements in the TON, up to around TON=14–27. For the new model systems reported herein, the quantum efficiency of the second photoinduced step in the Z-scheme photosynthesis is dramatically improved by introducing multiviologen tethers to temporarily collect the high-energy electron generated in the first photoinduced step. These are unique examples of “pigment–acceptor–catalyst triads”, which demonstrate a new effective type of artificial photosynthesis.


Title: Pigment–Acceptor–Catalyst Triads for Photochemical Hydrogen Evolution

Authors: Kyoji Kitamoto and Ken Sakai
DOI: 10.1002/anie.201311209

Article first published online: 28 March 2014