In:
Catalysis Science & Technology, Royal Society of Chemistry (RSC), Vol. 8, No. 9 ( 2018), p. 2352-2363
Abstract:
Stable and efficient photocatalyst has been a key research goal in recent years. Based on the dominant performances of MoS 2 , metal organic frameworks (MOFs) and Co 3 O 4 themselves, for example, MoS 2 has superior electronic properties, MOFs have a large specific surface area and Co 3 O 4 has a suitable band gap to give a visible light response, and with a view to overcome the disadvantages of MoS 2 , MOFs and Co 3 O 4 individually, for example, the poor stability of MOFs, cobalt ions being easily released from Co 3 O 4 , a distinctive organized molecular assemble of MoS 2 , MOF and Co 3 O 4 was successfully designed and assembled with the shape of a leaf. Namely, the special structure of MoS 2 –MOF appears as a leaf, and Co 3 O 4 looks like the venation. More importantly, an efficient dye-sensitized photocatalytic H 2 evolution was obtained. For instance, when the content of Co 3 O 4 was at 30%, the photocatalytic hydrogen production could reached up to 450.13 μmol in the EY-sensitized system under visible light irradiation within 5 hours. Moreover, the organized molecular assembled Co 3 O 4 greatly improved the stability of the photocatalyst. Here, MoS 2 and a metal organic framework (MOF) were combined to form a new structure catalyst MoS 2 –MOF, which provided a large specific surface area and sufficient active sites, the MoS 2 gave excellent electronic and optoelectronic properties and greatly improved the electron transport efficiency. The MoS 2 –MOF/Co 3 O 4 catalyst has a great fluorescence quenching rate, and the lifetime of the electron is also greatly improved. A peculiar synergetic effect of MoS 2 and Co 3 O 4 on the MOF for photocatalytic hydrogen evolution is revealed and the synergy of MoS 2 and Co 3 O 4 is the most critical factor. The above phenomena are supported by a series of characterization results such as SEM, XRD, TEM, EDX, XPS, BET, UV-vis DRS, FTIR, transient fluorescence and electro-chemistry, and so forth and the results of which were in good agreement with each other.
Type of Medium:
Online Resource
ISSN:
2044-4753
,
2044-4761
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2018
detail.hit.zdb_id:
2595090-3
detail.hit.zdb_id:
2627832-7
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