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Effect of Different Amounts of Pt on Fe 3 O 4 −TiO 2 for Photocatalytic H 2 Production Under Solar Light
Ist Teil von
ChemistrySelect (Weinheim), 2023-07, Vol.8 (27)
Erscheinungsjahr
2023
Quelle
Wiley Online Library Journals Frontfile Complete
Beschreibungen/Notizen
Abstract
In this study, Pt doped Fe
3
O
4
−TiO
2
photocatalysts were synthesized in two steps; (i) Fe
3
O
4
−TiO
2
(FT) was prepared by the complex‐assisted vapor thermal (VT) method, (ii) Pt was doped to Fe
3
O
4
−TiO
2
(FT−Pt) by the polyol method. The effect of different amounts of Pt was investigated for photocatalytic hydrogen production. The absorption spectrum of FT with 5.0 % Pt exhibits a surface plasmon resonance (SPR) peak of ∼420 nm which corresponds to the band gap of 2.95 eV. The FT and Pt doped FT samples showed a less intense photoluminescence (PL) band than TiO
2
(T) due to the lower e
−
/h
+
recombination rate. By increasing % wt. Pt in the FT samples, PL intensity was decreased. Thus, Pt plays an essential role to hinder the recombination of e
−
/h
+
pairs. Consequently, FT‐5.0 % Pt showed 144 μmol/g‐cat H
2
production rate, just about 3.3 times higher than that of FT photocatalyst; due to the suitable band gap energy and the retarded e
−
/h
+
recombination. Therefore, the synergistic effect of Pt and Fe
3
O
4
is found to be beneficial to decrease the e
−
/h
+
recombination rate thus the photocatalytic activity enhancement was achieved.