Table 1 Reported optimum tube lengths of TNTAs for organic pollutant decomposition, photovoltaics, and water splitting.

From: Tube length optimization of titania nanotube array for efficient photoelectrochemical water splitting

Anodization condition

Application

Tube length (µm)

Ref

Electrolyte

Potential (V)

Duration (h)

Obtained

Optimal

EG + NH4F + H2O

60

0.08–2

PC degradation of paraquat

1.5–25

5–7

12

EG + NH4F + H2O

30

1.25–3

PC degradation of MB

3.5–7

5

13

HF + H2O/CH3NO + NH4F + H2O

20

0.33–6

PC and PEC degradation of phenol

0.21–17

PC:12

PEC:0.21

14

EG + NH4F + H2O

15–60

3

PEC degradation of MO, RhB, MB

0.89–16.09

4.56

15

EG + NH4F + H2O

30

0.08–2

PEC water splitting

0.1–2.9

1.1

10

EG + NH4F + H2O

40

1–7

Dye sensitized solar cell

5–20

20

16

EG + NH4F + H2O

60

1–4

Dye sensitized solar cell

10–38

29

17

EG + HF + H2O

120

0.25–2

Dye sensitized solar cell

1–20

20

6

DMSO + HF + H2O

8–30

21–27

Dye sensitized solar cell

1.2–20

17.6

18

  1. EG ethylene glycol, PC photocatalytic, MB methylene blue, MO methyl orange, RhB rhodamine B.