Li Chunxue, Liu Xiaoteng, Huo Pengwei, Yan Yongsheng, Liao Guangfu, Ding Guixiang, Liu Chunbo
Institute of Green Chemistry and Chemical Technology, Advanced Chemical Engineering Laboratory of Green Materials and Energy of Jiangsu Province, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, China.
Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan, 430074, China.
Small. 2021 Oct;17(39):e2102539. doi: 10.1002/smll.202102539. Epub 2021 Aug 18.
Improving greatly the separation efficiency of interfacial charge carrier is a major challenge in photocatalysis. Herein, a new class of C -mediated NH -MIL-125(Ti)/Zn Cd S S-scheme heterojunction with enhanced interfacial charge carrier separation is designed and synthesized. The constructed S-scheme heterojunction thermodynamically favors photocatalytic H evolution because of the large driving force resulting from its strong redox abilities. As a consequence, the optimum proportion of C -mediated NH -MIL-125(Ti)/Zn Cd S S-scheme heterojunction displays comparable H evolution activity with a rate of 7825.20 µmol h g under visible light irradiation, which is about 93.05 times, 6.38 times and 2.65 times higher than that of 2% C /NH -MIL-125(Ti), Zn Cd S and 45% NH -MIL-125(Ti)/Zn Cd S, and outperforms the majority of the previously reported MOFs-based photocatalysts. Spectroscopic characterizations and theory calculations indicate that the S-scheme heterojunction can powerfully promote the separation of photogenerated carriers. This work offers a new insight for future design and development of highly active MOFs-based photocatalysts.
大幅提高界面电荷载流子的分离效率是光催化领域的一项重大挑战。在此，设计并合成了一类新型的具有增强界面电荷载流子分离能力的C介导的NH -MIL-125(Ti)/Zn Cd S S型异质结。所构建的S型异质结由于其强大的氧化还原能力所产生的大驱动力，在热力学上有利于光催化析氢。因此，C介导的NH -MIL-125(Ti)/Zn Cd S S型异质结的最佳比例在可见光照射下表现出相当的析氢活性，析氢速率为7825.20 µmol h g，分别比2% C /NH -MIL-125(Ti)、Zn Cd S和45% NH -MIL-125(Ti)/Zn Cd S高约93.05倍、6.38倍和2.65倍，并且优于大多数先前报道的基于金属有机框架（MOF）的光催化剂。光谱表征和理论计算表明，该S型异质结能够有力地促进光生载流子的分离。这项工作为未来设计和开发高活性的基于MOF的光催化剂提供了新的见解。
