| 초록 |
Photoelectrochemical water splitting has gained much attention as a mean of producing hydrogen. To expedite the use of sunlight upon the process, inorganic semiconductors have been widely adopted due to their superior optoelectronic properties. However, poor charge separation and accompanying significant charge recombination have been the limitation for scaling up. To address the challenges, we introduced the type II hetero structure to facilitate charge separation within photo-sensitizers. Herein, hydrothermally grown TiO2 nanowire was firstly decorated with Au NCs using deposition-precipitation method. Then, CdS and CdSe NCs were sequentially deposited onto TiO2/Au structure by chemical bath deposition. As a result, cyclic voltammetry (CV) confirmed the largely increased photocurrent density. Moreover, further introduction of Au NCs showed enhanced photocurrent density and larger exchange current from CV analysis, and decreased impedance, denoting the enhanced charge transfer. |
