CuCo$_{2}$S$_{4}$ Deposited on TiO$_{2}$: Controlling the pH Value Boosts Photocatalytic Hydrogen Evolution

Autor: Poschmann, M., Groß, H., Amin, R., Fritsch, C., Dankwort, T., Radinger, H., Indris, S., Kienle, L., Bensch, W.
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: European journal of inorganic chemistry, 38, 3692-3702
ISSN: 3692-3702
0009-2940
1099-0682
1434-1948
1434-2421
Popis: Metallic spinel-type CuCo$_{2}$S$_{4}$ nanoparticles were deposited on nanocrystalline TiO$_{2}$ (P25®), forming heterostructure nanocomposites. The nanocomposites were characterized in detail by X-ray powder diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), nitrogen sorption (BET) and UV/Vis spectroscopy. Variation of the CuCo$_{2}$S$_{4}$:TiO$_{2}$ ratio to an optimum value generated a catalyst which shows a very high photocatalytic H$_{2}$ production rate at neutral pH of 32.3 µmol/h (0.72 mLh$^{–1}$), which is much larger than for pure TiO$_{2}$ (traces of H$_{2}$). The catalyst exhibits an extraordinary long-term stability and after 70 h irradiation time about 2 mmol H$_{2}$ were generated. An increased light absorption and an efficient charge separation for the sample with the optimal CuCo$_{2}$S$_{4}$:TiO$_{2}$ ratio is most probably responsible for the high catalytic activity.
Databáze: OpenAIRE
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