Gel-like Ag-Dicyandiamide Metal–Organic Supramolecular Network-Derived g-C₃N₄ for Photocatalytic Hydrogen Generation

Abstract

H 2 could be the most promising, sustainable, and alternative energy source in the foreseeable future. In this study, a gel-like Ag-containing dicyandiamide metal−organic supramolecular network (MOSN) has been prepared as a precursor to synthesize g-C 3 N 4 for photocatalytic H 2 evolution under light irradiation. Ag can be well incorporated into the g-C 3 N 4 structure by using Ag-containing dicyandiamide MOSN as a precursor to produce a metal− semiconductor interface, thereby promoting the charge separation (evidenced by electrochemical impedance spectroscopy and photocurrent density measurement) and ultraviolet−visible light absorption (UV−vis absorption spectroscopy) and photocatalytic activity for H 2 evolution. g-C 3 N 4 derived from the Ag-containing dicyandiamide MOSN exhibits high H 2 evolution after Pt loadings under light irradiation (λ > 400, 450, and 550 nm) in the presence of triethanolamine. In summary, g-C 3 N 4 synthesized from Ag-containing dicyandiamide supramolecules can be used as an effective photocatalyst for H 2 production.

In Situ Synthesis of Nanostructured Composites of NiFe Layered Double Hydroxide and Polyaniline for Photocatalytic Degradation of Organic Pollutants and Remediation of Biological Contaminants

“…Figure 4e displays the highresolution spectra of the Ag 3d, where Ag 3d 5/2 and Ag 3d 3/2 doublet peaks at 367.35 and 373.26 eV with spin−orbit splitting around 6 eV have been observed, suggesting the formation of metallic silver. 59,60 The shifting (both positive and negative) of the XPS peak can be attributed to the change in electron density of the chemically different neighboring atoms/groups in the heterojunction, suggesting a strong attraction between the atomic nucleus and electrons. 54,61 UV−visible Analysis.…”

“…Similarly, the existence of the MAA moiety in the LDH/PANI/MAA/Ag nanocomposite has been confirmed by the S 2p core level spectra located at 161.92 and 162.73 eV for S 2p 3/2 and S 2p 1/2 spin state, respectively (Figure d). Figure e displays the high-resolution spectra of the Ag 3d, where Ag 3d 5/2 and Ag 3d 3/2 doublet peaks at 367.35 and 373.26 eV with spin–orbit splitting around 6 eV have been observed, suggesting the formation of metallic silver. , The shifting (both positive and negative) of the XPS peak can be attributed to the change in electron density of the chemically different neighboring atoms/groups in the heterojunction, suggesting a strong attraction between the atomic nucleus and electrons. , …”

Recycling Waste Melamine-Formaldehyde Resin as a Photocatalytic Enhancer for g-C3N4 Photocatalysts and Application in Photoelectrochemical (PEC) Reactions

“…Because of above characteristics, the g-C 3 N 4 photocatalyst is employed in a wide range of applications such as photocatalytic water oxidation, CO 2 reduction, degradation of organic pollutants in water, and sanitization of water. − However, short excited electron lifetime and fast hole–charge recombination are major factors inhibiting the photocatalytic activity of g-C 3 N 4 . To overcome the above drawbacks, infusing single metal atoms with g-C 3 N 4 , or constructing a heterojunction structure of g-C 3 N 4 with a pristine photocatalyst such as Fe 2 O 3 , BiVO 4 , or TiO 2 has been tried extensively to improve charge separation and electron transport for improved photoactivity of photocatalysts. − …”

Elevating Supercapacitor Performance of Co3O4-g-C3N4 Nanocomposites Fabricated via the Hydrothermal Method

“…The presence of pyrrolic nitrogen-hole defects inside the lattice, as well as the increased distance of nitrogen atoms covalently bonded at the edges, increases the material’s rate capacity. Furthermore, nitrogen sp 2 hybridization affords coordination sites, and the porous structure of heptazine contributes to these benefits [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. Graphitic carbon nitride (g-C 3 N 4 ) is an arrangement with a lamellar structure that is inherently nitrogen-rich.…”