A new composite electrode of Ni-Ferrite/TiOx/Si(111): Preparations and photoelectrochemical studies

A composite electrode of Ni-ferrite/TiOx/Si(111) was synthesized by grafting Ni2+Fe2+Fe3+–LDH–TiCl3 (LDH: Layered Double Hydroxides) on n-Si(111) surface and calcined under 1100 °C. Photoelectric research results indicated that the electrode had good photovoltaic effects in an electrolyte solution containing 7.6 M HI and 0.05 M I2, while platinum plate was used as counter-electrode. The observed photo-voltages (Upv) and photocurrent densities (jpc) of the electrode were at −0.75 V and 5.35 mA/cm2, respectively. Compared with electrodes of oxidized n-Si(111) crystal and n-Si(111) wafer covered by Ni-ferrites, jpc of the electrode Ni-ferrite/TiOx/Si(111) was increased greatly.

Graphical abstractNi2+Fe2+Fe3+–LDH–TiCl3 was grafted on n-Si(111) surface in bond-bridge of –(TiO)x–, and a composite electrode of Ni-ferrite/Si was obtained by calcinations of the corresponding LDH/Si assembly. Research results show that the composite electrode has good photovoltaic effects in 7.6 M HI/0.05 M I2 solution.Figure optionsDownload full-size imageDownload as PowerPoint slide