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A Robust, Precious‐Metal‐Free Dye‐Sensitized Photoanode for Water Oxidation: A Nanosecond‐Long Excited‐State Lifetime through a Prussian Blue Analogue
Author(s) -
Ulusoy Ghobadi T. Gamze,
Ghobadi Amir,
Buyuktemiz Muhammed,
Yildiz Elif Akhuseyin,
Berna Yildiz Dilara,
Yaglioglu H. Gul,
Dede Yavuz,
Ozbay Ekmel,
Karadas Ferdi
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201914743
Subject(s) - prussian blue , chromophore , photochemistry , nanosecond , cyanide , catalysis , metal , materials science , chemistry , precious metal , visible spectrum , electrochemistry , chemical engineering , electrode , nanotechnology , inorganic chemistry , optoelectronics , organic chemistry , optics , laser , physics , engineering
Herein, we establish a simple synthetic strategy affording a heterogeneous, precious metal‐free, dye‐sensitized photoelectrode for water oxidation, which incorporates a Prussian blue (PB) structure for the sensitization of TiO 2 and water oxidation catalysis. Our approach involves the use of a Fe(CN) 5 bridging group not only as a cyanide precursor for the formation of a PB‐type structure but also as an electron shuttle between an organic chromophore and the catalytic center. The resulting hetero‐functional PB‐modified TiO 2 electrode demonstrates a low‐cost and easy‐to‐construct photoanode, which exhibits favorable electron transfers with a remarkable excited state lifetime on the order of nanoseconds and an extended light absorption capacity of up to 500 nm. Our approach paves the way for a new family of precious metal‐free robust dye‐sensitized photoelectrodes for water oxidation, in which a variety of common organic chromophores can be employed in conjunction with CoFe PB structures.