Role of temperature and NiO addition in improving photocatalytic properties of TiO2 nanotubes

Free-standing TiO2 nanotubes decorated with spherical nickel nanoparticles as a cost-efficient electrocatalyst for oxygen evolution reaction

“…Nickel NPs can be produced via hydrothermal synthesis [8][9][10][11][12][13] and aerwards transferred onto the NTs or directly electrochemically deposited. [14][15][16][17][18] The electrochemical approach can be realized via constant voltage deposition, 14 pulsed current electroplating 15 or cyclic voltammetry (CV).…”

Atomic scale surface modification of TiO2 3D nano-arrays: plasma enhanced atomic layer deposition of NiO for photocatalysis

“…32 It has previously been demonstrated in literature that the addition of NiO to TiO 2 and the subsequent formation of a p-n junction prolongs photogenerated hole-electron lifetimes and increases PEC performance. 11,[33][34][35] As noted earlier, many factors such as film thickness, crystallinity, phase matching at grain boundaries, will all have a profound effect on the photocatalytic performance. However, the most significant factor by far is the p-type conductivity of the NiO.…”

“…A smaller onset potential was observed in TiO 2 −NiO samples in comparison with pristine TiO 2 , as expected. 11 At low bias (0 to 0.5 V RHE ), large anodic photocurrent transients appeared in TiO 2 −NiO samples, indicating trapping of photogenerated holes at the electrode-electrolyte interface. This is a common feature also observed in other TiO 2 systems loaded with different co-catalysts.…”

“…[8][9][10] NiO, alternatively when utilised as co-catalytic layer on TiO 2 photoandoes, NiO has been shown to reduce the onset potential and increase photoconversion efficiency. 11 It has been proposed the improvement of the photoanodes is a result of the formation of a P-N junction which increases charge separation and increase carrier lifetimes of TiO 2 . 12 TiO 2 can be grown in complex 3D structures which can improve the photoconversion efficiency of devices.…”

The Use of Anodic Oxides in Practical and Sustainable Devices for Energy Conversion and Storage

“…Depending on the desired properties of the resulting material, surface modification steps are needed, such as the deposition of nanoparticles [ 25 , 29 , 55 , 81 ], additional layers [ 23 , 82 , 83 ], or even the functionalization of the oxide surface [ 51 , 70 ]. The approaches adopted will be described in the next sections, according to the material’s application and required properties.…”