| 초록 |
Introduction of fluorenone, benzothiadiazole, dibenzothiophene sulfone units as acceptor and bithiophene as a donor (FO-BT, BZT-BT, DBS-BT) enables relative studies on the effects of chemical property of acceptor on photocatalytic activity for HER. Ultraviolet photoelectron spectroscopy shows energy difference between fermi level and HOMO level decrease in the same order with the case of optical bandgap resulting the highest intrinsic p-doping density of BZT-BT. In terms of HER, DBS-BT outperforms all other polymers showing the maximum HER of 2617 μmol g-1 h-1 (λ ＞ 420 nm) for 25 mg photocatalyst when dispersed in the presence of a triethyl amine sacrificial donor. As a result, we expect not only the high water-affinity of sulfone group enhances HER by improving statistical opportunity of molecular contact between DBS-BT conjugated backbone and water molecules, but also ambipolar characteristic of DBS-BT promotes HER by transporting electron to proton and hole to hole scavenger. |
