Metallic 1T′ MoS2 Boosts Graphitic C3N4 for Efficient Visible-light Photocatalysis

doi:10.7503/cjcu20200626

Abstract

Abstract:

Molybdenum disulfide（MoS₂），_{as one of the_{transition metal dichalcogenides， has been extensively investigated as a promising electrocatalyst or photocatalyst for solar energy applications. Among its polymorphs， 2H MoS₂ and 1T MoS₂applied in visible-light-driven photocatalysis has been demonstrated， but the photocatalytic performance including activity and stability is unsatisfactory. Herein， a composite of 1T′ MoS₂ ultrathin nanosheets and carbon nitride（g-C₃N₄） nanosheets is fabricated by combining thermal annealing and an electrostatic self-assemble method. The as-prepared nanocomposites exhibit better photocatalytic activity as 6.24 μmol?g^?1?h^?1 for H₂ evolution compared with 4.64 μmol?g^?1?h^?1for Pt decorated g-C₃N₄ nanosheets under visible light irradiation. Apart from this， the composites also show 0.19 min^?1for organic dye（methyl orange） degradation rate while the pure g-C₃N₄ exhibits 0.053 min^?1. The enhancement of photocatalytic performance can be ascribed to the synergistic effects between 1T′ MoS₂ and g-C₃N₄， which include improved light absorption and superior charge separation owing to great electron conductivity of 1T′ MoS₂. The kinetics model and degradation mechanism of the nanocomposites are also proposed.}}

Key words: 1T′ MoS₂, 2D nanocomposite, Photocatalysis, co-Catalyst

CLC Number:

O614.61

TrendMD:

JIA Bingquan, YE Bin, ZHAO Wei, XU Fangfang, HUANG Fuqiang. Metallic 1T′ MoS₂ Boosts Graphitic C₃N₄ for Efficient Visible-light Photocatalysis[J]. Chem. J. Chinese Universities, 2021, 42(2): 615.

Figures/Tables 6

Fig.1 XRD patterns of CNH and CNH/MoS2 2D nanocomposites(A), TEM images of 1T′ MoS2(B) and CNH/MoS2?0.5%(C), HADDF image(D) and EDS mapping of CNH/MoS2?0.5%(E—H)

Fig.2 XPS survey spectrum(A) and high resolution XPS spectra of C1s(B), N1s(C) and Mo3d(D) of CNH/MoS2?0.5%

Fig.3 UV?Vis DRS(A) and PL emmision(B) spectra of CNH and CNH/MoS2 catalysts

Fig.4 H2 evolution with different catalysts under visible light(A) and Bar plot showing the H2 evolution rates of different catalysts(B)(B) a. CHN; b. CNH/MoS2?0.2%; c. CNH/MoS2?0.5%; d. CNH/MoS2?1%; e. CNH/Pt?0.5%.

Fig.5 Photocatalytic degradation rates of MO with different catalysts under visible light(A), plots of ln(c/c0) against reaction time(B), bar plot showing the photodegradation rate of MO for 5 cycles using the CNH/MoS2?0.5% catalyst under visible light(C) and the MO degradation curves of the hybrid catalyst(D)(D) a. CNH/MoS2?0.5%; b. CNH/MoS2?0.5%+BQ; c. CNH/MoS2?0.5%+EDTA?2Na; d. CNH/MoS2?0.5%+IPA.

Fig.6 Scheme illustration and energy band of the charge transfer behaviors of CNH/MoS2 2D nanocomposites under visible light

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Metallic 1T′ MoS₂ Boosts Graphitic C₃N₄ for Efficient Visible-light Photocatalysis

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