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13. The new method of ZnIn2S4 synthesis on the titania nanotubes substrate with enhanced stability and photoelectrochemical performance.

Author

Roda, D., Trzciński, K., Łapiński, M., Gazda, M., Sawczak, M., Nowak, A. P., and Szkoda, M.

Subjects
NANOTUBES, CHARGE transfer, ELECTROLYTES, TEMPERATURE effect, HETEROJUNCTIONS
Abstract

In this work, ZnIn2S4 layers were obtained on fluorine doped tin oxide (FTO) glass and TiO2 nanotubes (TiO2NT) using a hydrothermal process as photoanodes for photoelectrochemical (PEC) water splitting. Then, samples were annealed and the effect of the annealing temperature was investigated. Optimization of the deposition process and annealing of ZnIn2S4 layers made it possible to obtain an FTO-based material generating a photocurrent of 1.2 mA cm−2 at 1.62 V vs. RHE in a neutral medium. In contrast, the highest photocurrent in the neutral electrolyte obtained for the TiO2NT-based photoanode reached 0.5 mA cm−2 at 1.62 V vs. RHE. In addition, the use of a strongly acidic electrolyte allowed the generated photocurrent by the TiO2NT-based photoanode to increase to 3.02 mA cm−2 at 0.31 V vs. RHE. Despite a weaker photoresponse in neutral electrolyte than the optimized FTO-based photoanode, the use of TiO2NT as a substrate allowed for a significant increase in the photoanode's operating time. After 2 h of illumination, the photocurrent response of the TiO2NT-based photoanode was 0.21 mA cm−2, which was 42% of the initial value. In contrast, the FTO-based photoanode after the same time generated a photocurrent of 0.02 mA cm−2 which was only 1% of the initial value. The results indicated that the use of TiO2 nanotubes as a substrate for ZnIn2S4 deposition increases the photoanode's long-term stability in photoelectrochemical water splitting. The proposed charge transfer mechanism suggested that the heterojunction between ZnIn2S4 and TiO2 played an important role in improving the stability of the material by supporting charge separation. [ABSTRACT FROM AUTHOR]

Published
2023
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47. Structural studies of bismuth nanocrystals embedded in SiO2 or GeO2 matrices

Author

Kusz, B., Pliszka, D., Gazda, M., Brusa, R.S., Trzebiatowski, K., Karwasz, G.P., Zecca, A., and Murawski, L.

Subjects
Bismuth -- Thermal properties, Germanium -- Thermal properties, Physics
Abstract

The layer of bismuth nanoclusters embedded in glass matrices and the surface layer of bismuth grains are obtained by thermal treatment in hydrogen atmosphere in Bi0.33Ge0.67O1.84 and Bi0.57Si0.43O1.72 glass. Structural changes undergoing in near-to-surface layers after the first steps of isothermal annealing are monitored by the use of a slow-positron beam.

Published
2003

48. Hebb–Wagner polarization method for determining the oxygen ion conductivity in barium cerate-zirconate.

Author

Miruszewski, T., Dzierzgowski, K., Winiarz, P., Wachowski, S., Mielewczyk-Gryń, A., and Gazda, M.

Abstract

In this work, the partial conductivity of oxygen ions in BaCe0.6Zr0.2Y0.2O3 was studied at different temperatures and water partial pressures. For this purpose, a modified DC Hebb–Wagner polarization method with an electrode blocking for protons and electrons was used. A new type of measuring cell as well as a suitable calculation model were proposed for the determination of partial oxygen ionic conductivity in materials with three mobile charge carriers, namely, oxygen ions, protons and electrons. The obtained oxygen ion partial conductivity (σO) in the BaCe0.6Zr0.2Y0.2O3 mixed protonic oxygen ionic–electronic conductor was 2.3 × 10−3 S cm−1 at 800 °C and pO2 = 0.20 atm, pH2O = 0.023 atm. This is in agreement with the literature reports and indicates the feasibility of this method for characterization of mixed-conducting ceramics with unknown oxygen ionic conductivity. The obtained results also indicate the influence of protons on the conduction mechanism of oxygen ions. This information may be very useful for the analysis of the interaction between the charge carriers in mixed conducting materials. [ABSTRACT FROM AUTHOR]

Published
2022
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