Enhanced hydrogen evolution reaction on highly stable titania-supported PdO and Eu2O3 nanocomposites in a strong alkaline solution - Publikacja - MOST Wiedzy

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Enhanced hydrogen evolution reaction on highly stable titania-supported PdO and Eu2O3 nanocomposites in a strong alkaline solution

Abstrakt

In this work, PdO/TiO2 and Eu2O3/TiO2 nanocomposites (NCs), were synthesized using a new facile, template-free and one-step solvothermal approach, and characterized by several instrumentation techniques. X-ray photoelectron spectroscopy (XPS) studies revealed the presence of oxidised form of the Pd and Eu nanoparticles within the nanocomposite materials (PdO and Eu2O3). The two catalysts exhibited remarkable activity for the HER in a strong alkaline solution (4.0 M NaOH) with PdO/TiO2 catalyst being the best, which recorded an exchange current density (jo) of 0.26 mA cm-2 and a Tafel slope (βc) of 125 mV dec-1. Such parameters are not far from those recorded for a commercial Pt/C catalyst (0.71 mA cm-2 and 120 mV dec-1) performed here under the same operating conditions. Eu2O3/TiO2 catalyst recorded jo and βc values of 0.05 mA cm-2 and 135 mV dec-1. The Tafel slopes 125 and 135 mV dec-1 calculated on the PdO/TiO2 and Eu2O3/TiO2 catalysts suggest a HER kinetics controlled by the Volmer step. PdO/TiO2 catalyzed the HER with a high turnover frequency (TOF) of 2.3 H2/s at 0.2 V versus the reversible hydrogen electrode (RHE), while Eu2O3/TiO2 catalyst only measured a TOF value of 1.25 H2/s at the same overpotential. The two catalysts exhibited excellent stability and durability after 10,000 cycles and 72 h of controlled potential electrolysis at a high cathodic overpotential, reflecting their practical applicability. SEM and XPS examinations revealed that the morphology and chemistry of both catalysts were not altered as a result of the performed long-term stability and durability tests

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Kategoria:
Publikacja w czasopiśmie
Typ:
artykuł w czasopiśmie wyróżnionym w JCR
Opublikowano w:
INTERNATIONAL JOURNAL OF ENERGY RESEARCH nr 43, strony 5367 - 5383,
ISSN: 0363-907X
Język:
angielski
Rok wydania:
2019
Opis bibliograficzny:
Ibrahim M., Mezni A., Alsawat M., Kumeriah T., Das M., Alzahly S., Aldalbahi A., Górnicka K., Ryl J., Amin M., Altalhi T.: Enhanced hydrogen evolution reaction on highly stable titania-supported PdO and Eu2O3 nanocomposites in a strong alkaline solution// INTERNATIONAL JOURNAL OF ENERGY RESEARCH. -Vol. 43, iss. 10 (2019), s.5367-5383
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1002/er.4629
Weryfikacja:
Politechnika Gdańska

wyświetlono 124 razy

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