Aluminum-TiO2 NPs Composites as Non-precious Catalysts for Efficient Electrochemical Generation of Hydrogen
PBN-AR
Instytucja
Wydział Chemiczny (Politechnika Gdańska)
Informacje podstawowe
Główny język publikacji
ENG
Czasopismo
ACS Applied Materials & Interfaces
ISSN
1944-8244
EISSN
Wydawca
DOI
URL
Rok publikacji
2016
Numer zeszytu
36
Strony od-do
655-667
Numer tomu
8
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
ALUMINUM
ELECTROCATALYSIS
HYDROGEN EVOLUTION REACTION
NANO-COMPOSITES
TITANIA NANOPARTICLES
Streszczenia
Język
Treść
In this paper we demonstrated, for the first time, aluminum-titania nanoparticles (Al-TiO2 NPs) composites with variable amounts of TiO2 NPs as non-precious active catalysts for the electrochemical generation of hydrogen. These materials were synthesized by mixing desired amounts of hydrogen titanate nanotubes (TNTs), fabricated here by a cost-effective approach at moderate hydrothermal conditions, with Al powder (purity: 99.7%, size: 35 µm). The mixture was compacted under an applied uniaxial stress of 300 MPa followed by sintering at 500 °C for 1h. After sintering has been completed, all TNTs were found to convert to TiO2 NPs (average particle size 15 nm). Finally, Al-xTiO2 NPs nano-composites (x = 1,3,5, and 10 wt%) were obtained and characterized by SEM/EDX, XRD, and XPS. The hydrogen evolution reaction (HER) activity of these materials was studied in 0.5 M H2SO4 at 298 K using polarization and impedance measurements. The nano-composite of chemical composition Al-5%TiO2 NPs showed the best catalytic performance for the HER, with onset potential (EHER), Tafel slope (βc), and exchange current density (jo) of -100 mV (RHE), 59.8 mV decade^−1, and 0.14 mA cm^-2, respectively. This HER activity is not far from that of the commercial Pt/C catalyst (EHER: 0.0 mV, βc: 31 mV dec^-1, and jo: 0.78 mA cm^-2). The best catalyst also exhibited good stability after 10,000 of repetitive cycling with negligible loss in current.
Inne
System-identifier
137251
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