CdS p-n heterojunction co-boosting with Co3O4 and Ni-MOF-74 for photocatalytic hydrogen evolution
CdS p-n heterojunction co-boosting with Co3O4 and Ni-MOF-74 for photocatalytic hydrogen evolution
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CdS p-n 异质结与 Co3O4 和 Ni-MOF-74 共同增强光催化析氢
DOI：
10.1039/c8dt02294a
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发表时间：
2018
影响因子：
4
通讯作者：
Jin Zhiliang
中科院分区：
文献类型：
--
作者：
Zhang Yongke;Wang Guorong;Ma Wang;Ma Bingzhen;Jin Zhiliang
成功制备了一种高效的Ni-MOF-74/CdS/Co3O4复合催化剂，即Ni-MOF-74和Co3O4共助推CdS。Ni-MOF-74/CdS/Co3O4 （10 wt% Co）光催化剂在可见光下最大析氢量可达581 μmol，是纯CdS的16.2倍。采用XRD、SEM、TEM、XPS、BET、uv -可见DRS等手段对Ni-MOF-74/CdS/Co3O4复合催化剂的物理化学内部机理进行了详细的研究。在最有价值的方面，我们通过光致发光光谱，激发态电子衰变和光电化学实验来研究光电子和空穴转移机理。结果表明：较低的电子和空穴对复合、较大的电子转移速率常数（KET = 0.2 × 109 s−1）、较大的电子注入效率（ηinj = 44.7%）、较小的半导体膜载流子电荷电阻（Rfilm = 3523 Ω cm2）和较小的半导体与电解质界面电荷转移和反应电阻（Rct = 1.96 Ω cm2）共同加速了电荷的分离和转移；从而提高光催化性能。
A high-efficiency Ni-MOF-74/CdS/Co3O4 composite catalyst, the CdS co-boosting with Ni-MOF-74 and Co3O4, is successfully prepared. The maximum amount of hydrogen evolution reaches about 581 μmol for 5 h over the Ni-MOF-74/CdS/Co3O4 (10 wt% Co) photocatalyst under visible light irradiation, which is 16.2 times higher than that over pure CdS. The detailed physical and chemical inner mechanism of the Ni-MOF-74/CdS/Co3O4 composite catalyst is investigated by means of XRD, SEM, TEM, XPS, BET, UV-visible DRS etc. In the most valuable aspect, we investigate the photoelectron and hole transfer mechanism by photoluminescence spectroscopy, excited state electron decay, and photoelectrochemical experiments. The results show that the lower electron and hole pair recombination, larger electron transfer rate constant (KET = 0.2 × 109 s−1), larger electron injection efficiency (ηinj = 44.7%), smaller carrier charge resistance in the semiconductor film (Rfilm = 3523 Ω cm2), and smaller charge transfer and reaction resistance at the interface between the semiconductor and the electrolyte (Rct = 1.96 Ω cm2) together accelerate the charge separation and transfer, thereby enhancing photocatalytic performance.