Synergistic Effect of the V2CTx MXene@V2O5/TiO2 NP Composite for Stimulating Photocatalytic CO2 Reduction through Bireforming of Methanol to Produce CO and CH4

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Abstract

Vanadium carbide (V2C) MXene, a transition metal, exhibits significant potential as an innovative cocatalyst to enhance photocatalytic efficiency. In this study, we explored the construction of a self-assembled V2C@V2O5/TiO2 composite through the sol-gel method, incorporating in situ grown vanadium oxide (V2O5) with TiO2. Efficient charge carrier separation was achieved owing to the higher conductivity, abundant active sites, and higher light absorbance. When V2C@V2O5/TiO2 was employed with a methanol-water mixture, the resulting CO and CH4 production reached remarkable amounts of 20 075 and 17 567 μmol g-1 h-1, respectively. This represented a substantial enhancement in photocatalytic efficiency compared to using water/H2 sacrificial reagents and pure TiO2 nanoparticles. This enhanced photoactivity in the presence of methanol was attributed to efficient photoinduced carrier separation, facilitated by the synergistic effect of V2C/V2O5 and increased proton production. Moreover, the performance of the V2C MXene-based composite for CO, CH4, and H2 formation was 1.45, 52.75, and 1.35 times higher, respectively, than that achieved with the V2AlC MAX-based TiO2 composite. The advantages of V2C conductivity and its two-dimensional layered structure contributed to achieving higher photocatalytic efficiency compared to using the MAX structure. The maximum quantum yield of 9.7, 8.488, and 0.352% for CO, CH4, and H2, respectively, was achieved over the V2C@V2O5/TiO2 composite with continuous photoactivity with consecutive cycles. This study not only demonstrates the promising prospects of V2C MXenes but also introduces an innovative approach for designing and fabricating highly efficient and stable photocatalytic systems for CO2 recycling, with potential applications in various energy-related fields.

Original languageEnglish
Pages (from-to)10183-10202
Number of pages20
JournalEnergy and Fuels
Volume38
Issue number11
DOIs
Publication statusPublished - Jun 6 2024

ASJC Scopus subject areas

  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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