Journal
SMALL
Volume 11, Issue 41, Pages 5556-5564Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201501822
Keywords
aqueous synthesis; gram scale synthesis; H-2 evolution; HAADF-STEM; 1T-MoS2
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Funding
- National Basic Research Program of China [2014CB848900, 2011CB921404]
- National Natural Science Foundation of China [U1232131, 11375198, 51172223, 21421063]
- CAS [XDB01020300]
- Fundamental Research Funds for the Central Universities [WK2310000035, WK2060190025, WK2060140014]
- USTCSCC, SCCAS, Tianjin
- Shanghai Supercomputer Centers
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Most recently, much attention has been devoted to 1T phase MoS2 because of its distinctive phase-engineering nature and promising applications in catalysts, electronics, and energy storage devices. While alkali metal intercalation and exfoliation methods have been well developed to realize unstable 1T-MoS2, but the aqueous synthesis for producing stable metallic phase remains big challenging. Herein, a new synthetic protocol is developed to mass-produce colloidal metallic 1T-MoS2 layers highly stabilized by intercalated ammonium ions (abbreviated as N-MoS2). In combination with density functional calculations, the X-ray diffraction pattern and Raman spectra elucidate the excellent stability of metallic phase. As clearly depicted by high-angle annular dark-field imaging in an aberration-corrected scanning transmission electron microscope and extended X-ray absorption fine structure, the N-MoS2 exhibits a distorted octahedral structure with a 2a(0) xa(0) basal plane superlattice and 2.72 angstrom Mo-Mo bond length. In a proof-of-concept demonstration for the obtained material's applications, highly efficient photocatalytic activity is achieved by simply hybridizing metallic N-MoS2 with semiconducting CdS nanorods due to the synergistic effect. As a direct outcome, this CdS:N-MoS2 hybrid shows giant enhancement of hydrogen evolution rate, which is almost 21-fold higher than pure CdS and threefold higher than corresponding annealed CdS:2H-MoS2.
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