| 研究実績の概要 |
I2 has successfully been identified as ideal replacement oxidant for polymerization of polyterthiophene (I2-PTTh) and similar thiophene-containing “ter-mers”. While illuminated I2-PTTh reached H2 evolution rates of 330 mmol h-1 g-1 other derivatives achieved up to 600 mmol h-1 g-1.
The maximum photo voltage depends on the position of the HOMO level of the polymer derivatives and for poly(pheny1-1,4 dithiophene) (PDTB) a photo voltage higher than the thermodynamical limit for water-splitting (1.23 V) was obtained, which facilitated complete light-driven water-splitting using MnOx as anode catalyst.
The catalytic activity for the polymers is not following the expected Nernstian dependency of pH, but rather shows an increase in onset potential at higher pH, which make them an ideal match for oxygen evolution electrodes like MnOx.
|
