期刊
ACS NANO
卷 10, 期 2, 页码 2903-2909出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b00001
关键词
molybdenum disulfide; photoelectrocatalysis; phase engineering supercritical CO2; heterostructure
类别
资金
- National Natural Science Foundation of China [51173170, 21101141]
- Innovation Talents Award of Henan Province [114200510019]
- Key program of science and technology from Zhengzhou Bureau of science and technology [121PZDGG213]
Molybdenum disulfide (MoS2) is a promising non -precious -metal catalyst, but its performance is limited by the density of active sites and poor electrical transport. Its metallic IT phase possesses higher photoelectrocatalytic activity. Thus, how to efficiently increase the concentration of the IT phase in the exfoliated two-dimensiaonal (2D) MoS2 nanosheets is an important premise. In this work, we propose a strategy to prepare a 2D heterostructure of MoS2 nanosheets using supercritical CO2-induced phase engineering to form metallic 1T-MoS2. Theoretical calculations and experimental results demonstrate that the introduced CO2 in the 2H-MoS2 host can prompt the transformation of partial 2H-MoS2 lattices into 1T-MoS2. Moreover, the electrical coupling and synergistic effect between 2H and IT phases can greatly facilitate the efficient electron transfer from the active sites of MoS2, which significantly improves the photocatalytic performance.
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