@article{Shao2023, 
author = {Gonglei Shao and Meiqing Yang and Haiyan Xiang and Song Luo and Xiong-Xiong Xue and Huimin Li and Xu Zhang and Song Liu and Zhen Zhou},
title = {Edge reconstruction of layer-dependent β-In2Se3/MoS2 vertical heterostructures for accelerated hydrogen evolution},
year = {2023},
journal = {Nano Research},
volume = {16},
number = {1},
pages = {1670-1678},
keywords = {hydrogen evolution reaction, edge reconstruction, microreactor, layer dependent, In2Se3/MoS2 heterostructure},
url = {https://www.sciopen.com/article/10.1007/s12274-022-4716-5},
doi = {10.1007/s12274-022-4716-5},
abstract = {The layer-dependent properties are still unclarified in two-dimensional (2D) vertical heterostructures. In this study, we layer-by-layer deposited semimetal β-In2Se3 on monolayer MoS2 to form vertical β-In2Se3/MoS2 heterostructures by chemical vapor deposition. The defect-mediated nucleation mechanism induces β-In2Se3 nanosheets to grow on monolayer MoS2, and the layer number of stacked β-In2Se3 can be precisely regulated from 1 layer (L) to 13 L by prolonging the growth time. The β-In2Se3/MoS2 heterostructures reveal tunable type-Ⅱ band alignment arrangement by altering the layer number of β-In2Se3, which optimizes the internal electron transfer. Meanwhile, the edge atomic structure of β-In2Se3 stacking on monolayer MoS2 shows the reconstruction derived from large lattice mismatch (~ 29%), and the presence of β-In2Se3 also further increases the electrical conductivity of β-In2Se3/MoS2 heterostructures. Attributed to abundant layer-dependent edge active sites, edge reconstruction, improved hydrophilicity, and high electrical conductivity of β-In2Se3/MoS2 heterostructures, the edge of β-In2Se3/MoS2 heterostructures exhibits excellent electrocatalytic hydrogen evolution performance. Lower onset potential and smaller Tafel slope can be observed at the edge of monolayer MoS2 coupled with 13-L β-In2Se3. Hence, the outstanding conductive layers coupled with edge reconstruction in 2D vertical heterostructures play decisive roles in the optimization of electron energy levels and improvement of layer-dependent catalytic performance.}
}