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Consecutive Charging of a Perylene Bisimide Dye by Multistep Low‐Energy Solar‐Light‐Induced Electron Transfer Towards H 2 Evolution
Author(s) -
Xu Yucheng,
Zheng Jiaxin,
Lindner Joachim O.,
Wen Xinbo,
Jiang Nianqiang,
Hu Zhicheng,
Liu Linlin,
Huang Fei,
Würthner Frank,
Xie Zengqi
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202001231
Subject(s) - triethanolamine , photochemistry , perylene , photocatalysis , chemistry , titanium dioxide , photosensitizer , visible spectrum , electron transfer , platinum nanoparticles , catalysis , molecule , platinum , materials science , organic chemistry , optoelectronics , analytical chemistry (journal) , metallurgy
Abstract A photocatalytic system containing a perylene bisimide (PBI) dye as a photosensitizer anchored to titanium dioxide (TiO 2 ) nanoparticles through carboxyl groups was constructed. Under solar‐light irradiation in the presence of sacrificial triethanolamine (TEOA) in neutral and basic conditions (pH 8.5), a reaction cascade is initiated in which the PBI molecule first absorbs green light, giving the formation of a stable radical anion (PBI .− ), which in a second step absorbs near‐infrared light, forming a stable PBI dianion (PBI 2− ). Finally, the dianion absorbs red light and injects an electron into the TiO 2 nanoparticle that is coated with platinum co‐catalyst for hydrogen evolution. The hydrogen evolution rates (HERs) are as high as 1216 and 1022 μmol h −1 g −1 with simulated sunlight irradiation in neutral and basic conditions, respectively.