Abstract
We report the structural, morphological, and optical characterization,
and the application of sodium-cerium molybdate (NaCe(MoO4)(2)) as a
promising photoelectroactive material for water splitting. Information
on these several properties was obtained by X-ray diffraction, Raman
spectroscopy, scanning electron microscopy, and UV-Vis-NIR diffuse
reflectance. For the photoelectrochemical tests, NaCe(MoO4)(2)
microcrystals were deposited on conductive indium-tin oxide (ITO) glass
substrate by drop coating, and the activity of the as-prepared
photoanode toward oxygen evolution reaction was investigated in the
absence and presence of blue light-emitting diode irradiation. Studies
carried out by linear sweep voltammetry, chronoamperometry, and
electrochemical impedance spectroscopy attested to a significant
photoelectroactivity of molybdate associated with the fast electron-hole
pairs generation. The steady-state photocurrent density recorded under
irradiation achieved a remarkable increase, varying from 1.5 mu A cm(-2)
(light off) to 44.1 mu A cm(-2) (light on), in addition, it presents
high stability after on-off cycles, what proves the proper performance
of NaCe(MoO4)(2)/ITO as photoanode for water splitting.
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