I get dark current of TiO2 nanorod, constantly decaying in nature(i.e, no sign of saturation).
Why the dark current is not stable in nature alike ZnO nanorod?
The dark current flows because of the difference in the Fermi levels between the electrode (TiO2 nanotubes in this case ) and electrolyte. One should get non-zero (positive or negative) dark current at zero externally applied bias as charged particles flow from the higher Fermi level to the lower one. Because of high active surface area/ contact area of 1D nanostructured materials, the Fermi levels of the electrode material and electrolyte take much more time to get aligned. Moreover, due to the absence of the external stirring of the electrolyte you get to see such behaviour of the dark current. However, apart from decay nature, you may also experience gradual increment of the dark current, depending upon the choice of electrode and electrolyte.
You may read the following papers....
1. Phys. Chem. Chem. Phys., 2016, 18, 26900--26912
Article Surface functionalized H2Ti3O7 nanowires engineered for visi...
2. J. Phys. Chem. C, 2017, 121(46), 25705 −25717Article Designing Co-Pi Modified One-Dimensional n–p TiO2/ZnCo2O4 Na...
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