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Covalent-organic framework based Z-scheme heterostructured noble-metal-free photocatalysts for visible-light-driven hydrogen evolution
Ist Teil von
Journal of materials chemistry. A, Materials for energy and sustainability, 2020-02, Vol.8 (8), p.4334-434
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2020
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The construction of a Z-scheme heterostructured system is an effective way to improve the separation of photogenerated electrons-holes and the hydrogen evolution activity of photocatalysts. In this work, for the first time, we report a class of covalent-organic framework (COF) based Z-scheme heterostructured hybrids for efficient visible-light-driven photocatalytic hydrogen evolution. An excellent visible-light harvesting COF, TpPa-2-COF, was chosen to integrate with α-Fe
2
O
3
for the construction of Z-scheme hybrids. As a result, the α-Fe
2
O
3
/TpPa-2-COF (3 : 7) hybrid material shows an optimal hydrogen evolution rate of 3.77 mmol h
−1
g
−1
without the participation of any noble metal co-catalyst. This hydrogen evolution rate is about 53 times higher than that of the parent TpPa-2-COF under the same conditions and comparable to that with a Pt (2 wt%) co-catalyst. Further investigations confirm that the tight integration of α-Fe
2
O
3
and 2D COFs can effectively promote the transfer of photogenerated electrons from the CB of α-Fe
2
O
3
to the VB of COFs thus leading to an efficient separation of photogenerated charges of the COF and a greatly enhanced photoactivity. Considering the first report of the COF-based Z-scheme heterostructure as a noble-metal-free photocatalyst for efficient hydrogen evolution, this work may open a new pathway for the further design and synthesis of COF-based hybrid photocatalysts for efficient H
2
evolution.
A COF-based Z-scheme heterostructure hybrids (α-Fe
2
O
3
/TpPa-2-COF) for noble-metal-free photocatalytic hydrogen evolution.