Composite of rare earth oxides with
TiO2 nanotube arrays
can effectively modify the photoelectrochemical (PEC) behavior of
TiO2. A CeO2/TiO2 heterojunction
was prepared by loading CeO2 nanoparticles on anodized
TiO2 nanotube (TNT) arrays for PEC water splitting. The
CeO2/TNT electrode exhibited a high photocurrent density
of 2.11 mA·cm–2, 4.3 times that of pure TNT
(0.49 mA·cm–2) at 1.23 V vs RHE under AM 1.5G
light. And CeO2/TNT realized a high PEC H2 evolution
rate of 17.86 μmol/h, 4.5 times that of pure TNT at 1.55 V vs
RHE. The effective performance of the CeO2/TNT electrode
could be attributed to its reasonable band gap structure facilitating
visible light absorption and efficient charge transfer, inhibiting
the recombination of electron/hole pairs. This work confirms the successful
construction of CeO2/TiO2 heterojunction on
TNT arrays for improving the PEC performance of TiO2 for
H2 production.
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