Distinctive organized molecular assemble of MoS2, MOF and Co3O4, for efficient dye-sensitized photocatalytic H2 evolution,Catalysis Science & Technology

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Distinctive organized molecular assemble of MoS2, MOF and Co3O4, for efficient dye-sensitized photocatalytic H2 evolution
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2018-03-29 00:00:00 , DOI: 10.1039/c8cy00380g
Kai Fan _{1,

2,

3,

4} , Zhiliang Jin _{1,

2,

3,

4} , Guorong Wang _{1,

2,

3,

4} , Hao Yang _{1,

2,

3,

4} , Duanduan Liu _{1,

2,

3,

4} , Hongyan Hu _{4,

5,

6,

7} , Gongxuan Lu _{4,

5,

6,

7} , Yingpu Bi _{4,

5,

6,

7}

Affiliation

Stable and efficient photocatalyst has been a key research goal in recent years. Based on the dominant performances of MoS₂, metal organic frameworks (MOFs) and Co₃O₄ themselves, for example, MoS₂ has superior electronic properties, MOFs have a large specific surface area and Co₃O₄ has a suitable band gap to give a visible light response, and with a view to overcome the disadvantages of MoS₂, MOFs and Co₃O₄ individually, for example, the poor stability of MOFs, cobalt ions being easily released from Co₃O₄, a distinctive organized molecular assemble of MoS₂, MOF and Co₃O₄ was successfully designed and assembled with the shape of a leaf. Namely, the special structure of MoS₂–MOF appears as a leaf, and Co₃O₄ looks like the venation. More importantly, an efficient dye-sensitized photocatalytic H₂ evolution was obtained. For instance, when the content of Co₃O₄ 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 Co₃O₄ greatly improved the stability of the photocatalyst. Here, MoS₂ and a metal organic framework (MOF) were combined to form a new structure catalyst MoS₂–MOF, which provided a large specific surface area and sufficient active sites, the MoS₂ gave excellent electronic and optoelectronic properties and greatly improved the electron transport efficiency. The MoS₂–MOF/Co₃O₄ catalyst has a great fluorescence quenching rate, and the lifetime of the electron is also greatly improved. A peculiar synergetic effect of MoS₂ and Co₃O₄ on the MOF for photocatalytic hydrogen evolution is revealed and the synergy of MoS₂ and Co₃O₄ 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.

中文翻译：

独特的MoS的有序分子组装₂，MOF和Co ₃ ø ₄，为了有效的染料敏化光催化ħ ₂进化

稳定和高效的光催化剂已成为近年来的主要研究目标。基于MoS ₂的主要性能，例如，金属有机骨架（MOF）和Co ₃ O ₄本身，MoS ₂具有优越的电子性能，MOF具有大的比表面积，而Co ₃ O ₄具有合适的能带隙产生可见光响应，并试图克服MoS ₂，MOF和Co ₃ O ₄的缺点，例如，MOF的稳定性较差，钴离子很容易从独特的有组织分子Co ₃ O _4中释放出来MoS组装_{如图2所示}，成功地设计并组装了具有叶片形状的MOF和Co₃ O₄。即，MoS₂ -MOF的特殊结构看起来像一片叶子，而Co₃ O₄看起来像脉。更重要的是，获得了有效的染料敏化的光催化H₂放出。例如，当Co₃ O₄的含量为30％时，在5小时内可见光照射下EY增感体系中的光催化产氢量可达到450.13μmol。此外，有组织的分子组装的Co₃ O₄大大提高了光催化剂的稳定性。在此，将MoS ₂和金属有机骨架（MOF）结合形成一种新型结构催化剂MoS ₂ -MOF，该催化剂具有较大的比表面积和足够的活性位，MoS ₂具有出色的电子和光电性能，并极大地改善了电子传输效率。MoS ₂ -MOF / Co ₃ O ₄催化剂具有很高的荧光猝灭速率，并且电子的寿命也大大提高了。揭示了MoS ₂和Co ₃ O ₄对MOF光催化制氢的独特协同作用，并且MoS的协同作用₂和Co₃ O₄是最关键的因素。上述现象得到一系列表征结果的支持，如SEM，XRD，TEM，EDX，XPS，BET，UV-vis DRS，FTIR，瞬态荧光和电化学等，其结果均良好彼此同意。

更新日期：2018-03-29

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