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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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Cyclic voltammetries of RDS-NiOx on FTO substrate at different scan rates. OCV: 3.24 V vs Li+/Li. Electrolyte as in Fig. 1. Arrows indicate the verse of scan
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Fig5: Cyclic voltammetries of RDS-NiOx on FTO substrate at different scan rates. OCV: 3.24 V vs Li+/Li. Electrolyte as in Fig. 1. Arrows indicate the verse of scan

Mentions: The onset of CS oxidation is about 2.85 V vs Li+/Li. This indicates that the pristine film of CS contains a fraction of Ni(III) sites the open circuit voltage (OCV) being 3.07 V vs Li+/Li. This has been further confirmed by XPS data that present signals associated to the presence of Ni(III) in pristine mesoporous NiOx (Marrani et al. 2014; Gibson et al. 2013). Analogous considerations hold in the case of RDS nickel oxide samples (Fig. 5). RDS NiOx is characterized by the onset of oxidation at about 2.75 V vs Li+/Li, and by an OCV value of 3.24 V vs Li+/Li.Fig. 5


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)

Cyclic voltammetries of RDS-NiOx on FTO substrate at different scan rates. OCV: 3.24 V vs Li+/Li. Electrolyte as in Fig. 1. Arrows indicate the verse of scan
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig5: Cyclic voltammetries of RDS-NiOx on FTO substrate at different scan rates. OCV: 3.24 V vs Li+/Li. Electrolyte as in Fig. 1. Arrows indicate the verse of scan
Mentions: The onset of CS oxidation is about 2.85 V vs Li+/Li. This indicates that the pristine film of CS contains a fraction of Ni(III) sites the open circuit voltage (OCV) being 3.07 V vs Li+/Li. This has been further confirmed by XPS data that present signals associated to the presence of Ni(III) in pristine mesoporous NiOx (Marrani et al. 2014; Gibson et al. 2013). Analogous considerations hold in the case of RDS nickel oxide samples (Fig. 5). RDS NiOx is characterized by the onset of oxidation at about 2.75 V vs Li+/Li, and by an OCV value of 3.24 V vs Li+/Li.Fig. 5

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