@article{Wang2023, 
author = {Shuai Wang and Xin Du and Changhao Yao and Yifeng Cai and Huiyuan Ma and Baojiang Jiang and Jun Ma},
title = {S-scheme heterojunction/Schottky junction tandem synergistic effect promotes visible-light-driven catalytic activity},
year = {2023},
journal = {Nano Research},
volume = {16},
number = {2},
pages = {2152-2162},
keywords = {α-Fe2O3, Schottky junction, step-scheme heterojunction, bisphenol A, ZnIn2S4, MXene Ti3C2 quantum dots (QDs)},
url = {https://www.sciopen.com/article/10.1007/s12274-022-4960-8},
doi = {10.1007/s12274-022-4960-8},
abstract = {Designing photocatalysts with high light utilization and efficient photogenerated carrier separation for pollutant degradation is one of the important topics for sustainable development. In this study, hierarchical core–shell material α-Fe2O3@ZnIn2S4 with a step-scheme (S-scheme) heterojunction is synthesized by in situ growth technique, and MXene Ti3C2 quantum dots (QDs) are introduced to construct a double-heterojunction tandem mechanism. The photodegradation efficiency of α-Fe2O3@ZnIn2S4/Ti3C2 QDs to bisphenol A is 96.1% and its reaction rate constant attained 0.02595 min−1, which is 12.3 times that of pure α-Fe2O3. Meanwhile, a series of characterizations analyze the reasons for the enhanced photocatalytic activity, and the charge transport path of the S-scheme heterojunction/Schottky junction tandem is investigated. The construction of the S-scheme heterojunction enables the photo-generated electrons of α-Fe2O3 and the holes of ZnIn2S4 to transfer and combine under the action of the reverse built-in electric field. Due to the metallic conductivity of Ti3C2 QDs, the photogenerated electrons of ZnIn2S4 are further transferred to Ti3C2 QDs to form a Schottky junction, which in turn forms a double-heterojunction tandem mechanism, showing a remarkable charge separation efficiency. This work provides a new opinion for the construction of tandem double heterojunctions to degrade harmful pollutants.}
}