Table 2

Effects of incorporating MWNTs on the electron transport properties of fabricated cells

Electrode composition

Charge-transfer resistance at the ZnO/electrolyte interface [Rk] (ohm)

Electron transport resistance in the ZnO network [Rw] (ohm)

Ratio of Rk to Rw

Mean electron lifetime (ms)

Electron diffusion coefficient in the photoanode (10-4 cm2 s-1×)

Effective electron diffusion length (micrometer)


ZnO

50.17

6.49

7.73

10.30

4.80

22.2

ZnO/0.01 wt% O-MWNT

27.15

1.39

19.53

6.85

18.25

35.4

ZnO/0.01 wt% acid-MWNT

41.56

3.62

11.48

8.00

9.18

27.1


The thickness of the ZnO or ZnO/MWNT film was 8 μm.

Chang et al. Nanoscale Research Letters 2012 7:166   doi:10.1186/1556-276X-7-166

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