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321 results on '"Taghipour, Fariborz"'

36. Enhanced Photocatalytic CO2 Reduction by Amine Functionalization of Graphitic Carbon Nitride.

Author

LaChance, Robert, Adeli, Babak, and Taghipour, Fariborz

Subjects
NITRIDES, CHARGE carrier mobility, PHOTOREDUCTION, SURFACE chemistry, AMINES, VISIBLE spectra, PROTON transfer reactions
Abstract

Graphitic carbon nitride (g‐CN) is a promising photocatalyst for solar fuel generation, but its charge carrier mobility, charge recombination, and CO2 reduction/H2 evolution efficacy and selectivity are a strong function of the synthesis and postsynthesis techniques employed. Protonation and phosphorous doping of g‐CN yield promise visible light activities, promoting enhanced CO2 reduction and hydrogen evolution. However, the amine‐functionalized surface chemistry of g‐CN gains little attention in open literature. Herein, g‐CN and phosphorus‐doped g‐CN are synthesized via facile one‐pot pyrolysis and subjected to protonation postsynthesis to quantify the influence of common strategies on surface amine content and photocatalyst activity for H2 evolution and CO2 reduction. Material characterization confirms the exfoliation of the photocatalyst and change in the amine functionalization of the surface. The amorphous phosphorus‐doped g‐CN material exhibits a high number of surface amine groups, increasing the adsorption prior to reduction and enhancing selectivity for CO2 reduction. [ABSTRACT FROM AUTHOR]

Published
2024
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47. Solar Fuel Generation by 2D Self-Assembled g-C3N4/BiVO4 Z-Scheme.

Author

LaChance, Robert, Adeli, Babak, and Taghipour, Fariborz

Subjects
CHARGE carrier mobility, CHARGE carriers, NITRIDES, BAND gaps, CHARGE exchange, GRAPHENE oxide
Abstract

Graphitic carbon nitride (g-CN) is a promising photocatalyst for solar fuel generation due to its medium band gap and facile synthesis from earth-abundant materials. However, low charge carrier mobility and high charge recombination have hampered the observed rate of H2 evolution and CO2 reduction. Herein, an electrostatically self-assembled 2D Z-scheme heterojunction between g-CN and bismuth vanadate (BiVO4) is investigated with and without reduced graphene oxide (rGO) acting as an electron transfer mediator to speed charge carrier mobility and hamper charge recombination. Protonation of the g-CN surface allow for self-assembly between 2D sheets of g-CN, rGO, and BiVO4. The mass ratio between g-CN and BiVO4 is incrementally adjusted to optimize synergistic charge transportation effects versus shadowing effects of multicomponent photocatalysts. Further, a selectivity effect is observed across mass ratios of photocatalyst constituents, allowing tuning of photocatalyst yield. [ABSTRACT FROM AUTHOR]

Published
2024
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