Visible light-driven water oxidation with a subporphyrin sensitizer and a water oxidation catalyst.
A new subporphyrin was synthesized for use as a molecular sensitizer in electrochemical and dye-sensitized photoelectrochemical water oxidation. A photoelectrochemical cell with a TiO2electrode modified with the sensitizer and a molecular water oxidation catalyst generated higher photocurrent than reference cells that have electrodes modified with either the photosensitizer or the catalyst under visible light (λ > 500 nm) illumination. Oxygen evolution was confirmed after photolysis by GC and GC-MS analyses using isotope-labeling experiments. The large molar extinction coefficients of the ring-contracted porphyrin in the visible region enabled kinetic analysis by time-resolved transient absorption spectroscopy, which also supported the photocatalytic activity.
Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan. imahori@scl.kyoto-u.ac.jp.
Masanori
http://orcid.org/0000-0001-8473-7015
M
Yamamoto
Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan. imahori@scl.kyoto-u.ac.jp.
Yusuke
Y
Nishizawa
Department of Chemical Physics, Lund University, Box 124, 22100 Lund, Sweden. villy.sundstrom@chemphys.lu.se.
Pavel
P
Chábera
Department of Chemistry, School of Chemical Science and Engineering, KTH Royal Institute of Technology, 10044 Stockholm, Sweden. lichengs@kth.se.
Fusheng
F
Li
Department of Chemical Physics, Lund University, Box 124, 22100 Lund, Sweden. villy.sundstrom@chemphys.lu.se.
Torbjörn
T
Pascher
Department of Chemical Physics, Lund University, Box 124, 22100 Lund, Sweden. villy.sundstrom@chemphys.lu.se.
Villy
V
Sundström
Department of Chemistry, School of Chemical Science and Engineering, KTH Royal Institute of Technology, 10044 Stockholm, Sweden. lichengs@kth.se.
Licheng
L
Sun
Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan. imahori@scl.kyoto-u.ac.jp and Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.
Hiroshi
http://orcid.org/0000-0003-3506-5608
H
Imahori