| 초록 |
The increasing energy demand and environmental pollution are today’s most important problems and the scientific community is searching a new form of energy alternative to fossil fuels which is one of the primary research topics of the 21st century. Hydrogen is the fuel of the future because of high gravimetric energy density and clean combustion. Hydrogen can be produced by photoelectrochemical water splitting method by using semiconductor photoanode/photocathode. The efficient, stable, visible light absorption and cost effective photoelectrode materials are certainly important in developing highly efficient PEC system. TiO2 is the most widely investigated photoanode material for PEC water splitting due to their low cost, non-toxicity, high chemical and thermal stability. In the present work, we have integrated r-GO (reduced graphene oxide) and charge transfer complex Cu-TCNQ (Copper-Tetracyanoquinodimethane) with TiO2 nanotubes (NTs) for PEC water splitting application. The r-GO and Cu-TCNQ complex were incorporated onto the surface of TiO2 NTs by electrophoretic deposition (EPD) method. The fabricated TiO2 NTs/r-GO/Cu-TCNQ array photoanode was systematically characterized by using various techniques. The obtained experimental results reveal that rGO with a high work function and superior electron mobility accepts photogenerated electrons from TiO2 NTs and enables fast electron transportation; while Cu-TCNQ acts as a OER electrocatalyst (co-catalyst) which accelerates the surface water oxidation reaction. |
