Inserting MOF into flaky CdS photocatalyst forming special structure and active sites for efficient hydrogen production
Inserting MOF into flaky CdS photocatalyst forming special structure and active sites for efficient hydrogen production
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将MOF插入片状CdS光催化剂中形成特殊结构和活性位点以高效产氢
DOI：
10.1016/j.ijhydene.2019.05.233
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发表时间：
2019-07-26
影响因子：
7.2
通讯作者：
Han, Fenglan
中科院分区：
文献类型：
--
作者：
Jin, Zhiliang;Wang, Zejin;Han, Fenglan
利用MOFs独特的结构和性能，采用水热法成功制备了CdS/ZIF-67复合光催化剂，实现了高效的析氢。所得到的复合光催化剂不仅可以利用ZIF-67的比表面积提供更大的反应场所，而且可以通过CdS与ZIF-67之间的结合位点积极促进反应。在可见光（5 W LED白色光）照射下，5 h内最大析氢量达到308 mol，比纯ZIF-67高约50倍。复合光催化剂的稳定性明显强于单一组分。通过电化学实验对结合位点的深入研究表明，光催化剂的光电流已提高到1.8 μ A cm（-3），这表明结合位点的存在能有效提高电子转移速率。它们之间的协同作用也会促进电子-空穴的分离，降低复合率。因此，从电子转移的角度提出了反应机理，以加深理解。(C)2019年氢能出版有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
Due to unique structure and properties of MOFs, a well-designed functional CdS/ZIF-67 composite photocatalyst was successfully synthesized by hydrothermal synthesis to achieve efficient hydrogen evolution. The obtained composite photocatalyst can not only make use of the specific surface area of ZIF-67 to provide a larger reaction place, but also can positively promote the reaction by binding sites between CdS and ZIF-67. Under visible light (5 W LED white light) irradiation, the maximum amount of hydrogen evolution reached 308 mol in 5 h which was about 50 times higher than that of pure ZIF-67. The composite photocatalyst exhibited a significantly stronger stability than single component. The in-depth study of binding sites by electrochemical experiments showed that the photocurrent of the photocatalyst has increased to 1.8 mu A cm(-3), which showed that the existence of binding sites could effectively improve the electron transfer rate. And the synergy between them also can promote the separation of electron-holes and reduce the recombination rate. Therefore, reaction mechanism was proposed from the view of electron transfer for deep understanding. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.