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Photocatalytic CO2 Reduction Over Ni-Modified Cd1−xZnxS-Based Photocatalysts: Effect of Phase Composition of Photocatalyst and Reaction Media on Reduction Rate and Product Distribution

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Two types of nickel-modified Cd1−xZnxS-based photocatalysts, CdxZn1−xNiySy+1 (mol% Ni = 0.05–0.5; x = 0.8) and yNiS/CdxZn1−xS (mol% Ni = 0.1–1.0; x = 0.8), were prepared via a simple two-stage technique. The samples were characterized by XRD, UV–vis spectroscopy, and XPS techniques. The activity of the synthesized photocatalysts were tested in the gas-phase photocatalytic reduction of CO2 under visible light (λ = 450 nm). It has been shown that both CdxZn1−xNiySy+1 and yNiS/CdxZn1−xS samples with ultra-low content of nickel sulfide have improved activity in the carbon dioxide reduction in comparison to bare CdxZn1−xS solid solutions. Also, it has been demonstrated that the addition of the reducing agent—hydrogen—into the system does not lead to a positive effect: the rate of CO2 reduction either remains unchanged or decreases.

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This work was supported by Ministry of Science and Higher Education of the Russian Federation (Project AAAA-A17-117041710087-3) and by RFBR Grant No. 18-03-00775.

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Correspondence to Ekaterina A. Kozlova.

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Kozlova, E.A., Lyulyukin, M.N., Markovskaya, D.V. et al. Photocatalytic CO2 Reduction Over Ni-Modified Cd1−xZnxS-Based Photocatalysts: Effect of Phase Composition of Photocatalyst and Reaction Media on Reduction Rate and Product Distribution. Top Catal (2020).

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  • Cd1−xZnxS
  • Photocatalytic CO2 reduction
  • Visible light
  • Bulk and surface modification