Toward enhanced photocatalytic activity of graphite carbon nitride through rational design of noble metal-free dual cocatalysts

Abstract

<p>The g-C₃N₄-MoS₂-M(OH)_x ternary heterostructures were designed and fabricated for the first time.</p>

Boosting Photocatalytic Activity Using Carbon Nitride Based 2D/2D van der Waals Heterojunctions

“…MoS 2 demonstrated excellent HER activity due to S terminated edge and S–Mo–S layered structure analogous to carbon nitride that minimizes lattice mismatch in the 2D/2D heterostructure resulting in improved charge separation. , The pioneering work by Hou et al demonstrated lateral growth of MoS 2 sheets on g-C 3 N 4 using a (NH 4 ) 2 MoS 4 precursor followed by sulfidation with H 2 S gas at 350 °C . The TEM images demonstrated 2–3 layered thick MoS 2 grown on the surface of carbon nitride, while XPS spectra confirm the presence of populated Mo 4+ and S 2– in a well-constituted MoS 2 structure.…”

Competitive Self-Assembly of PANI Confined MoS2 Boosting the Photocatalytic Activity of the Graphitic Carbon Nitride

“…Moreover, the electron paramagnetic resonance (EPR) spectroscopy was employed to confirm the formation H 2 O 2 in the photocatalytic process with 5,5-dimethyl-1-pyrroline N-oxide (DMPO) as a spin-trapping agent. 53,54 It could be observed from Figure S12 that the H 2 O was oxidized into •OH under visible light irradiation. Moreover, both the g-C 3 N 4 -MoS 2 and the g-C 3 N 4 -PANI-MoS 2 exhibited excellent photocatalytic stability over 30 h (Figure 5d), which was further confirmed by the stable morphology and phase structure as convinced by the TEM and XRD results (Figure S13).…”

“…Strikingly, even in pure water, g-C 3 N 4 -PANI-MoS 2 , and g-C 3 N 4 -MoS 2 exhibited photocatalytic HER performance of 1.18 and 0.38 μmol/h under UV–visible light irradiation and 0.25 and 0.11 μmol/h/g under visible light irradiation, respectively (Figure S11a), with a corresponding amount of H 2 O 2 (Figure S11b). Moreover, the electron paramagnetic resonance (EPR) spectroscopy was employed to confirm the formation H 2 O 2 in the photocatalytic process with 5,5-dimethyl-1-pyrroline N-oxide (DMPO) as a spin-trapping agent. , It could be observed from Figure S12 that the H 2 O was oxidized into ·OH under visible light irradiation. Moreover, both the g-C 3 N 4 -MoS 2 and the g-C 3 N 4 -PANI-MoS 2 exhibited excellent photocatalytic stability over 30 h (Figure d), which was further confirmed by the stable morphology and phase structure as convinced by the TEM and XRD results (Figure S13).…”

Conductive polymer mediated earth abundant Z-scheme g-C3N4/Fe2O3 heterostructure with excellent photocatalytic activity

“…7,12,13 However, problems such as high interfacial resistance and hydrogen evolution reaction overpotential of g-C 3 N 4 deteriorate the separation, transport and utilization efficiency of photo-exited charge carriers. 7,[12][13][14][15][16] To improve the transport and utilization efficiency, cocatalysts with low overpotential for the hydrogen and/or oxygen evolution reaction (HER, OER) overpotential and suitable band structure were adopted. 7,17 Consequently, many cocatalysts (Pt, MoS 2 , transition metals and their compounds) have been introduced as the cocatalysts of g-C 3 N 4 for facilitating its photocatalytic hydrogen production efficency.…”