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Photoelectrochemical properties of mesoporous NiO x deposited on technical FTO via nanopowder sintering in conventional and plasma atmospheres.

Awais M, Dowling DD, Decker F, Dini D - Springerplus (2015)

Bottom Line: Photoelectrochemical effects of sensitized RDS NiO x were evidenced upon oxide reduction.With the addition of iodine RDS NiOx electrodes could give the reduction iodine → iodide in addition to the reduction of RDS NiO x . p-type dye sensitized solar cells were assembled with RDS NiO x photocathodes sensitized either by ERY or Fast Green.Resulting overall efficiencies ranged between 0.02 and 0.04 % upon irradiation with solar spectrum simulator (I in: 0.1 W cm(-2)).

View Article: PubMed Central - PubMed

Affiliation: Department of Industrial Engineering, "King Abdulaziz" University, Rabigh, KSA.

ABSTRACT
Nanoporous nickel oxide (NiO x ) has been deposited with two different procedures of sintering (CS and RDS). Both samples display solid state oxidation at about 3.1 V vs Li+/Li. Upon sensitization of CS/RDS NiO x with erythrosine b (ERY), nickel oxide oxidation occurs at the same potential. Impedance spectroscopy revealed a higher charge transfer resistance for ERY-sensitized RDS NiO x with respect to sensitized CS NiO x . This was due to the chemisorption of a larger amount of ERY on RDS with respect to CS NiO x . Upon illumination the photoinduced charge transfer between ERY layer and NiO x could be observed only with oxidized CS. Photoelectrochemical effects of sensitized RDS NiO x were evidenced upon oxide reduction. With the addition of iodine RDS NiOx electrodes could give the reduction iodine → iodide in addition to the reduction of RDS NiO x . p-type dye sensitized solar cells were assembled with RDS NiO x photocathodes sensitized either by ERY or Fast Green. Resulting overall efficiencies ranged between 0.02 and 0.04 % upon irradiation with solar spectrum simulator (I in: 0.1 W cm(-2)).

No MeSH data available.


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Nyquist plots in the high (upper plot), medium (center plot), and low (lower plot) frequency range for CS NiOx at 1.2, 2.4, 3.1 and 3.7 V vs Li+/Li. Arrows indicate the verse of growing frequencies for the different profiles
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Fig16: Nyquist plots in the high (upper plot), medium (center plot), and low (lower plot) frequency range for CS NiOx at 1.2, 2.4, 3.1 and 3.7 V vs Li+/Li. Arrows indicate the verse of growing frequencies for the different profiles

Mentions: The electrochemical impedance spectra of CS- and RDS-NiOx have been recorded at different applied potential values. The chosen values of polarization correspond to different states of oxidation of the NiOx samples (Figs. 4, 5). The impedance spectra reflect the changes of the electrical transport properties that NiOx undergoes when the oxide alters the state of oxidation (Decker et al. 1992). Data are presented in Figs. 15 and 16. For semiconducting metal oxides possessing intercalation properties, the model which is usually adopted for the interpretation of their impedance spectra is the one of Ho et al. (1980) who proposed the Randles circuit (Fig. 17). This model accounts for the phenomena related with the charge transfer across the interface NiOx electrode/electrolyte through the resistive term θ (charge transfer resistance through the interface), and the capacitive term CDL (double layer capacitance). Moreover it accounts also for the transport properties associated with the diffusive motion of the charge carriers through the electrode itself (term ZW* related to the diffusion of electroactive species) (Ho et al. 1980).Fig. 15


Photoelectrochemical properties of mesoporous NiO x deposited on technical FTO via nanopowder sintering in conventional and plasma atmospheres.

Awais M, Dowling DD, Decker F, Dini D - Springerplus (2015)

Nyquist plots in the high (upper plot), medium (center plot), and low (lower plot) frequency range for CS NiOx at 1.2, 2.4, 3.1 and 3.7 V vs Li+/Li. Arrows indicate the verse of growing frequencies for the different profiles
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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Show All Figures
getmorefigures.php?uid=PMC4627985&req=5

Fig16: Nyquist plots in the high (upper plot), medium (center plot), and low (lower plot) frequency range for CS NiOx at 1.2, 2.4, 3.1 and 3.7 V vs Li+/Li. Arrows indicate the verse of growing frequencies for the different profiles
Mentions: The electrochemical impedance spectra of CS- and RDS-NiOx have been recorded at different applied potential values. The chosen values of polarization correspond to different states of oxidation of the NiOx samples (Figs. 4, 5). The impedance spectra reflect the changes of the electrical transport properties that NiOx undergoes when the oxide alters the state of oxidation (Decker et al. 1992). Data are presented in Figs. 15 and 16. For semiconducting metal oxides possessing intercalation properties, the model which is usually adopted for the interpretation of their impedance spectra is the one of Ho et al. (1980) who proposed the Randles circuit (Fig. 17). This model accounts for the phenomena related with the charge transfer across the interface NiOx electrode/electrolyte through the resistive term θ (charge transfer resistance through the interface), and the capacitive term CDL (double layer capacitance). Moreover it accounts also for the transport properties associated with the diffusive motion of the charge carriers through the electrode itself (term ZW* related to the diffusion of electroactive species) (Ho et al. 1980).Fig. 15

Bottom Line: Photoelectrochemical effects of sensitized RDS NiO x were evidenced upon oxide reduction.With the addition of iodine RDS NiOx electrodes could give the reduction iodine → iodide in addition to the reduction of RDS NiO x . p-type dye sensitized solar cells were assembled with RDS NiO x photocathodes sensitized either by ERY or Fast Green.Resulting overall efficiencies ranged between 0.02 and 0.04 % upon irradiation with solar spectrum simulator (I in: 0.1 W cm(-2)).

View Article: PubMed Central - PubMed

Affiliation: Department of Industrial Engineering, "King Abdulaziz" University, Rabigh, KSA.

ABSTRACT
Nanoporous nickel oxide (NiO x ) has been deposited with two different procedures of sintering (CS and RDS). Both samples display solid state oxidation at about 3.1 V vs Li+/Li. Upon sensitization of CS/RDS NiO x with erythrosine b (ERY), nickel oxide oxidation occurs at the same potential. Impedance spectroscopy revealed a higher charge transfer resistance for ERY-sensitized RDS NiO x with respect to sensitized CS NiO x . This was due to the chemisorption of a larger amount of ERY on RDS with respect to CS NiO x . Upon illumination the photoinduced charge transfer between ERY layer and NiO x could be observed only with oxidized CS. Photoelectrochemical effects of sensitized RDS NiO x were evidenced upon oxide reduction. With the addition of iodine RDS NiOx electrodes could give the reduction iodine → iodide in addition to the reduction of RDS NiO x . p-type dye sensitized solar cells were assembled with RDS NiO x photocathodes sensitized either by ERY or Fast Green. Resulting overall efficiencies ranged between 0.02 and 0.04 % upon irradiation with solar spectrum simulator (I in: 0.1 W cm(-2)).

No MeSH data available.


Related in: MedlinePlus