Electrochemical Characterization of Nanoporous Nickel Oxide Thin Films Spray-Deposited onto Indium-Doped Tin Oxide for Solar Conversion Scopes

Figure 16

(a) High- and (b) low-frequency electrochemical impedance spectra of RDS NiO_x ( μm) spray-deposited onto ITO. Impedance spectra were recorded at different applied potentials (). The selected values of are related to the nature of the NiO_x layer, in the pristine uncharged state ( V versus Li⁺/Li), in the partially oxidized state ( = 2.8 V versus Li⁺/Li), and in the fully oxidized state ( = 3.5 V versus Li⁺/Li). For electrolyte and cell configuration used, see Figure 1. In the upper plot the arrows indicate the direction of increase for the frequency of polarization.

(a)

(b)