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6 protocols using fto glass

1

Fabrication of NdTiO2+xN1-x Photoanodes

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The NdTiO2+xN1–x powder was assembled
into a thin film on precleaned conductive fluorine-doped tin oxide
(FTO) glass (2.2 mm thick, Sigma-Aldrich) via an electrophoretic deposition
(EPD) process. Concisely, 20 mg of NdTiO2+xN1–x was dispersed in 30 mL of
acetone containing 10 mg of iodine by 20 min sonication to obtain
a uniform suspension. Two FTO slides were immersed into the suspension
parallelly with an ∼10 mm gap, and then a 35 V bias was applied
between them for 1 min. The FTO/NdTiO2+xN1–x photoanodes were dried naturally
in air.
A NbCl5 impregnation step, which was adapted
from TaCl5 and TiCl4,15 (link),23 (link) was performed to improve the connection of particles. The FTO/NdTiO2+xN1–x photoelectrode was soaked in 0.1 M NbCl5 (99.99 wt %,
abcr GmbH) dissolved in ethanol for 10 s and dried on a hot plate
at 423 K. After repeating this procedure for four rounds, the electrode
was then annealed in air at 573 K for 1 h to obtain FTO/NdTiO2+xN1–x/Nb2O5. The electrode was further decorated
with a water oxidation cocatalyst, i.e., CoOx. A 45 μL aliquot of 7 mM Co(NO3)2 dissolved in methanol was dropped on the FTO/NdTiO2+xN1–x/Nb2O5 surface followed by annealing at 473 K for 1 h. The
composite electrode was washed with distilled water.
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2

Synthesis of BDCA Precursor and CdS Films

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Toluene (5
mL) and of 1-butylamine (C4H9–NH2) (3 mL) are taken in a 25 mL glass vial. This is kept inside
an ice bath. To the above mixture, 1.5 mL of carbon disulphide (CS2) solution is added slowly dropwise under gentle stirring.
The solution changes from colorless to slightly yellow. This confirms
the formation of BDCA. Following this, 1 mmol of antimony(III) oxide
is added to the BDCA solution. The mixture is heated at 70 °C
for 30 min until the metal oxide is completely dissolved, and the
solution turns dark yellow. This solution is further heated to remove
unreacted butylamine and CS2. After removal of unreacted
chemicals, the solution becomes highly viscous. The viscosity of this
solution typically depends on the added metal oxide concentration.
Trace amounts of insoluble metal oxide particles are removed by centrifugation
(speed: 8000≈ rpm) and stored in a closed glass vial at room
temperature for further use. The CdS precursor solution is also prepared
by the protocol as discussed above. Instead of toluene, ethanol is
used as the solvent. This resulted in better adhesive films on the
fluorine-doped tin oxide glass (Sigma-Aldrich FTO glass—sheet
resistance—8 Ω/sq, thickness ≈ 550 nm) substrate
compared to when films are cast using toluene.
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3

Hydrothermal Synthesis of WO3 Thin Films

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WO3 thin films were produced on fluorine doped tin oxide
(FTO) glass
(4 cm × 1.8 cm, 2.2 mm thick, Sigma-Aldrich) by a hydrothermal
synthesis method. FTO substrates were ultrasonically cleaned in diluted
nitric acid, acetone, and ethanol for 15 min each in sequence and
then dried in an ambient atmosphere. A 0.165 g portion of sodium tungstate
dihydrate (Na2WO4·2H2O, 99.9%,
Acros Organics) and a 0.126 g portion of H2C2O4·2H2O were dissolved in 5 and 10 mL
of deionized water by stirring, respectively. The two solutions were
then mixed with stirring, and 10 mL of 1 M HCl was added and stirred
for 10 min. A 6 mL portion of the mixed solution was transferred to
a 20 mL Teflon-lined stainless steel autoclave, where a FTO substrate
was placed inside with the conducting side facing down and leaning
against the inner wall. The autoclave was tightly sealed and heated
at 180 °C for 2 h, and then it was cooled to room temperature.
After that, the FTO glass was cautiously washed with water and dried
in the air. The monoclinic WO3 thin film grown on an FTO
substrate could be achieved after annealing at 550 °C for 1 h
and then cooling to room temperature under an ambient atmosphere.
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4

FTO Glass Substrate Preparation

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All chemicals were of analytical reagent grade and used without further purification. The fluorine-doped tin oxide (FTO) glass (7 Ω sq−1, transparency 80%, Sigma Aldrich, USA) was used as the conductive substrate. All aqueous solutions were prepared with triple distilled water by Millipore.
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5

Synthesis of Perovskite Solar Cell Components

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Nickel(ii) chloride hexahydrate (99.9%), selenium powder (99%), oleylamine (OLA, 70%), oleic acid (OA, 98%), toluene (anhydrous, 99.8%), ethanol (96%), acetone (99.5%), acetylacetone (≥99%), isopropanol (anhydrous, 99.5%), hexane (anhydrous, 95%), lithium perchlorate, lithium iodide (99.99%), iodine (synthetic grade), 4-tert-butylpyridine (98%), N-methyl-2-pyrrolidone (NMP, anhydrous 99.5%), anatase TiO2 nanoparticles (<25 nm particle size, 99.7%), acetic acid (99.7%), distilled water, dishwashing liquid (©Sunlight) as an alternative to hydroxypropyl cellulose, N-719 dye (95%), and FTO glass (surface resistivity ∼ 7 Ω sq−1); all these were purchased from Sigma Aldrich.
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6

Fabrication of Dye-Sensitized Solar Cell

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CoS or doped CoS is then coated on a FTO substrate according to a widely used CE preparation method.32,33 (link) To prepare the CE for DSSCs, 0.2 g of the obtained nanopowders were suspended in 2 mL ethanol by sonication and magnetic stirring; then 0.86 mL terpineol and 1.1 mL ethyl cellulose in ethanol (10 wt%) were dipped into the mixture solution one by one, followed by again stirring and sonication. The resulting paste was coated onto the FTO glass (Sigma-Aldrich, R = 7 Ω sq−1) via spin coating method at 4000 rpm for 30 s. Afterwards, the CEs were annealed at 450 °C in Ar for 30 min. Moreover, the commercial Pt CE purchased from Dalian HepatChroma Solar-Tech Co., Ltd was used as a reference.
TiO2 nanoparticle photoanodes were prepared by spin-casting a ∼160 nm TiO2 under layer and doctor-blading technique to form a 10 μm TiO2 nanocrystalline layer. Then, the TiO2 photoanodes were immersed into 0.05 M TiCl4 aqueous solution at 70 °C for 30 min. Subsequently, the photoanodes were calcined at 450 °C for 0.5 h in air. After cooling at room temperature, the TiO2 photoanodes were took out and immersed in a 0.50 mM ethanol solution of N719 dye (purchased from DYESOL LTD) for 24 h. Finally, the dye-sensitized TiO2 photoanodes were took out from dye solution and washed with anhydrous ethanol. The active area of photoanodes was ∼0.25 cm2 (0.5 cm × 0.5 cm).
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