1 research outputs found
Tandem Structure of QD Cosensitized TiO<sub>2</sub> Nanorod Arrays for Solar Light Driven Hydrogen Generation
One-dimensional (1D) TiO<sub>2</sub> nanorod arrays as photoelectrode
have great potential for solar photoelectrochemical (PEC) hydrogen
generation. However, the large band gap and Ti-growth unit preference
of rutile TiO<sub>2</sub> limit its solar light utilizing and multijunction
nanostructure photoelectrode design. This paper presents a double-sided
tandem structure for quantum dot cosensitized photoelectrodes with
excellent solar PEC hydrogen generation. TiO<sub>2</sub> nanorod arrays
were grown directly on transparent and conductive glass substrates
by hydrothermal method and then coated with CdS or CdSe as photosensitizer
to extend successfully their photoresponse to visible light. Given
the transparent substrate, TiO<sub>2</sub> nanorod arrays could be
grown on both sides, allowing the formation of the tandem structure
of cosensitized CdS and CdSe with high reactivity under visible light.
The double-sided CdS and CdSe cosensitized 1D TiO<sub>2</sub> photoelectrode
exhibited the highest solar-to-hydrogen conversion efficiency of 2.78%
and pronounced enhancement of simulated photoconversion efficiency.
This success in fabricating a double-sided tandem structure 1D TiO<sub>2</sub> photoelectrode provides the opportunity for composite material
design based on different band gaps, and this photoelectrode could
be applied to other PEC applications