| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 98 === The size-varied nanorods TiO2 have been synthesized with different kind of stabilizer and chelating agent by two steps hydrothermal reaction, and characterized by TEM, XRD, BET, SEM. The nanorods TiO2 (EOA) has 1-D structure, pure anatase, higher surface area, good thermal stability and the light-to-electricity conversion efficiency is 5.64%. Commercial TiO2 P25 only reached 5.07%.
Owing to EOA have better transparency, but lack of scattering property; three kinds of larger nanorods TiO2 have been synthesized as scattering layer particles: TMA-L, TMA-M, TMA-S; the length are about 500~600nm, 250nm, 200nm, respectively. The double layer structure of EOA and TMA-L have better efficiency 5.84% due to TMA-L have better scattering property characterized by UV-vis, and the incident photon-to-current efficiency (IPCE) data show that the conversion efficiency higher than monolayer EOA at high wavelength region.
Due to scattering layer couldn’t provide enough surface area, three different EOA/TMA-L composites are blended with 75wt% (EL31), 50wt% (EL11), 25 wt% (EL13) EOA. Higher efficiency of 6.08% is achieved by
double layer structure of EOA and EL11 and the IPCE data show that the conversion efficiency similar to double layer structure of EOA and TMA-L at high wavelength region but higher at low wavelength region. The data show EL11 not only have high scattering property but also have large surface area.
|
|---|
