DataVXJournal of Materials SciencePaper
journal article·2023-07

Construction and characterization of intramolecular tri-s-triazine heterostructures

Renan da Fonseca Bez, Júlia da Silveira Salla, Suélen Maria de Amorim, Enrique Rodríguez-Castellon, Maria Olga Guerrero-Pérez, João Paulo Winiarski, Klaus Krambrock, Regina de Fatima Peralta Muniz Moreira, Rosely Aparecida Peralta

Journal of Materials Science· Volume 58· Issue 28
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Source abstract

Abstract

Tri-s-triazine heterostructures have been prepared using different mass ratios of g-C3N4, melem, mellitic trianhydride (MTA), and graphene as precursors. The heterostructures were characterized by elemental analysis (CHN), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), specific surface area, thermogravimetric analysis (TGA/DTA), and diffuse reflection spectroscopy (DRS). The formation of reactive species under light irradiation was verified by electron paramagnetic resonance (EPR). Hydrogen evolution reactions (HER) were conducted in a potentiostat. According to the results, the heterostructures produced with melem and MTA are formed by mellitic triimide (MTI) and tri-s-triazine species (g-C3N4 and melem) layers. EPR spin-trapping experiments showed hydroxyl radicals formation when the materials were irradiated, which, however, are produced indirectly by superoxide anion radicals. The increased amount of MTI is detrimental to photocatalytic activity. On the other hand, we proved that the increase in the MTA content increased the HER. The results showed that modulation of MTI content in intramolecular tri-s-triazine heterostructures is a promising approach for producing materials for photo- and electrocatalysis. Metal-free hybrid photocatalysts of tri-s-triazine species (melem and g-C3N4), graphene, and mellitic trianhydride (MTA) were synthesized: g-g, g-m, and g-g-m. The mellitic triimide (melem and MTA) ratio and graphene as a cocatalyst in heterostructures for generating reactive oxygen species (in visible light) and hydrogen evolution reactions were evaluated.
Source: expertdata · Quality: candidate unverified · Source record ↗

Research context

NanomaterialsCatalysis & surfaces

OpenAlex topics: Advanced Photocatalysis Techniques · Covalent Organic Framework Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

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