What is the reaction in electrodeposition of ZnO?

What is the reaction in electrodeposition of ZnO?

A fundamental reaction in electrodeposition of ZnO is based on reduction of an oxygen precursor to OH -, followed by reaction with Zn 2+ ions, according to the scheme: (1)Zn2++2OH-⇔Zn (OH)2 The zinc hydroxide formed in this reversible reaction is transformed at elevated temperature into zinc oxide: (2) Zn ( OH) 2 ⟶ temp.

What can ZnO nanorod arrays be used for?

ZnO nanorods (NRs) are promising components in a wide range of nanoscale devices for future applications in photocatalysis, solar cells, optical devices and biochemical sensing.

What kind of substrate is used for ZnO NRS?

In the latter case, the ZnO NRs are usually deposited on a transparent conducting oxide (TCO) substrate i.e. glass plate covered either with a thin layer of indium-tin oxide (ITO) or F-doped SnO 2 (FTO) and the length, diameter and density of nanorods are important parameters influencing the solar cell efficiency.

How are nanorods obtained from a conducting substrate?

The nanorods in the form of arrays vertically oriented to the substrate may be obtained by electrochemical deposition but morphology of the film is very sensitive to the synthesis conditions.

How are ZnO nanorods used in solar cells?

In solar cells, ZnO used in many solar cell’s structures such as n-ZnO/Cu 2 O-p heterojunction [ 7 ], chalcopyrite [ 8 ], Kesterite [ 9] and perovskite [ 10 ]. It has been employed also as an electrode material for electrochemical applications [ 11 ].

Which is the best orientation for ZnO nanorods?

The results show that the sample deposited with the seed layer time of 60 s, has a good crystallinity and preferred orientation along the plane (002) and high nanorod density with smaller diameter size. The sample showed an enhanced photoelectrochemical response with low carrier density, compared to other ZnO samples.