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

Poschmann, M.; Groß, H.; Amin, R.; Fritsch, C.; Dankwort, T.; Radinger, H.; Indris, S.; Kienle, L.; Bensch, W.

Abstract:
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.

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Verlagsausgabe §
DOI: 10.5445/IR/1000123301
Veröffentlicht am 07.09.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 15.10.2020
Sprache Englisch
Identifikator ISSN: 0009-2940, 1099-0682, 1434-1948, 1434-2421
KITopen-ID: 1000123301
HGF-Programm 37.01.12 (POF III, LK 01) Intercalation
Erschienen in European journal of inorganic chemistry
Verlag Wiley-VCH Verlag
Band 38
Seiten 3692-3702
Vorab online veröffentlicht am 17.07.2020
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Scopus
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