Tailoring assemblies of plasmonic silver/gold and zinc-gallium layered double hydroxides for photocatalytic conversion of carbon dioxide using UV-visible light

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Abstract

In the search for novel efficient photocatalysts for the conversion of CO<inf>2</inf> into fuels, plasmonic photocatalysts based on the self-assemblies of silver or gold nanoparticles with [Zn<inf>3</inf>Ga(OH)<inf>8</inf>]<inf>2</inf>CO<inf>3</inf>·mH<inf>2</inf>O layered double hydroxide (Zn<inf>3</inf>Ga|CO<inf>3</inf> LDH) were prepared and tested for the photoreduction of CO<inf>2</inf> by H<inf>2</inf> under irradiation with UV-visible light. Ag and Au nanoparticles were obtained directly on the LDHs via the ion-exchange method or the reconstruction method of the LDHs. The catalysts exhibited intense surface plasmon resonance (SPR) effect at 411 and 555 nm attributable to Ag and Au nanoparticles, respectively. The rate of CO<inf>2</inf> photoreduction on Ag/Zn<inf>3</inf>Ga|CO<inf>3</inf> increased by a factor of 1.69 than that of Zn<inf>3</inf>Ga|CO<inf>3</inf> while the methanol selectivity also increased from 39 to 54 mol%. On Au/Zn<inf>3</inf>Ga|CO<inf>3</inf>, the reduction rate of CO<inf>2</inf> was 1.78 times higher than on Zn<inf>3</inf>Ga|CO<inf>3</inf> LDH whereas the methanol selectivity decreased from 39 to 13 mol%. Electron microscopy and UV-visible and X-ray spectroscopy detected particular interactions of the cationic layers of Zn<inf>3</inf>Ga|CO<inf>3</inf> with Ag and Au nanoparticles. Results show that for Ag/Zn<inf>3</inf>Ga|CO<inf>3</inf> catalysts, CO<inf>2</inf> photoreduction by H<inf>2</inf> under visible light was promoted by the SPR effect of Ag nanoparticles while for Au/Zn<inf>3</inf>Ga|CO<inf>3</inf> catalysts Au nanoparticles might act as electron-trapping active sites.

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Kawamura, S., Puscasu, M. C., Yoshida, Y., Izumi, Y., & Carja, G. (2015). Tailoring assemblies of plasmonic silver/gold and zinc-gallium layered double hydroxides for photocatalytic conversion of carbon dioxide using UV-visible light. Applied Catalysis A: General, 504, 238–247. https://doi.org/10.1016/j.apcata.2014.12.042

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