Synergetic catalytic behavior of AgNi-OH-Pi nanostructures on Zr:BiVO4photoanode for improved stability and photoelectrochemical water splitting performance
Al-Mayouf, Maged N. Shaddad, Prabhakarn Arunachalam ⇑, Asma A. Alothman, Abeer M. Beagan, Matar N. Alshalwi, Abdullah M. . 2019
Photoelectrocatalytic methodologies are attractive for the longstanding storage of renewable energy via
direct transformation of solar energy into fuels and chemicals. Controlled electrodeposition of thin and
homogeneous nickel hydroxylphosphate (Ni-OH-Pi) nanoparticle films on Zr:BiVO4 photoanodes was
achieved, wherein the Ni-OH-Pi co-catalyst increased the photoelectrochemical (PEC) water oxidation
and stability of photoanodes comprising silver phosphate (AgPi) on Zr:BiVO4 (AgNi-OH-Pi/Zr:BiVO4).
Evaluation of the optical, structural, and morphological properties revealed that the AgNi-OH-Pi/Zr:
BiVO4 photoanodes exhibited enhanced PEC behavior with photocurrent densities (Jph) of
3.14 mA cm2 for water oxidation with long-term stability over 60 h and 4.15 mA cm2 for hydrogen
peroxide (0.5 M H2O2) oxidation. The enhanced PEC of the fabricated AgNi-OH-Pi/Zr:BiVO4 photoanodes
was attributed to the synergetic influence of strong visible-light absorption, enhanced charge separation–
transport, and exceptional surface properties. Considering their comparatively superior photocatalytic
activity, the AgNi-OH-Pi/Zr:BiVO4 photoanodes are potential electrode candidates in solar water splitting,
dye-sensitized solar cells, and photocatalysis.
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