200 400 600 800 1000 1200 1400 1600 1800 2000

Wavenumber(cm"1)

Figure 4. Raman spectra of a) pure NiO electrode, b) LC-NiO electrode by dipping at atmospheric pressure, c) LC-NiO electrode by dipping at vacuum after heat treatment at 800°C for 2 hours.

Table 1. shows the electrical conductivity of various electrodes. The electrical conductivity of LC-NiO cathode was measured to be more than 5 times as high as that of pure NiO.

Electrode

NiO

LC-NiO

Conductivity(ohm''cm"')

3.23 x 10°

1.82 x 10"*

The performance of unit cell using the LC-NiO cathode showed in Figure 5. For 250 hours of steady operation of unit cells, the mean voltage of the cells were 0.78V for NiO(a) and 0.85V for LC-NiO(b) at a current density of 150mA/cm2.

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