Outstanding stability and photoelectrochemical catalytic performance of (Fe, Ni) co-doped Co3O4 photoelectrodes for solar hydrogen production
نویسندگان
چکیده
In this work, pure and (Fe, Ni) co-doped Co3O4 nanostructured photoelectrodes of different doping levels thicknesses were manufactured at constant substrate temperature (450 °C) using the spray pyrolysis technique. addition to chemical compositions; structural, optical, electrical, photoelectrochemical (PEC) properties investigated through use various analysis techniques. By increasing codpoing ratio 6%, low energy band gap is decreased from 1.43 1.3 eV high bandgap increased 2.63 2.87 eV, in reduction particle size 30.2 12.0 nm. The vanishes by codoped film's spread volume 60 ml. X-ray photoelectron spectroscopy 6%(Fe, Ni)-60ml confirms existence Ni2+,3+ Fe2+,3+. Among studied photoelectrodes, photoelectrode displays a photocatalytic hydrogen output rate 150 mmol/h.cm2 @-1V 0.3M Na2SO4 electrolyte. photocurrent density reached up 13.6 mA/cm2@-1V with an IPCE (incident photon current conversion efficiency) ∼42%@405 nm STH (solar ∼11.37%, which are highest values yet for Co3O4-based photocatalysts. value ABPE(applied bias photon-to-current 0.34%@(-0.28V 636 nm). Interestingly, shows photogenerated −0.14 mAcm−2 0 V PEC onset over 0.266V. thermodynamic parameters, corrosion surface areas, Tafel slopes, impedance spectroscopies also being confirm classify H2 production mechanism. stability/reusability only 6.6% performance after ten successive runs -1V 1.2 nm/year. This work offered new codoping strategy design highly active based photocatalyst generation solar light-driven hydrogen.
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ژورنال
عنوان ژورنال: International Journal of Hydrogen Energy
سال: 2021
ISSN: ['0360-3199', '1879-3487']
DOI: https://doi.org/10.1016/j.ijhydene.2021.01.113