The co-dopant concentration dependence on visible light photocatalytic efficiency in SrTi1-xFe[x/2]Cr[x/2]O3 (0.01 ≤ x ≤ 0.2) perovskite photocatalysts
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초록
We studied the co-dopant (Fe-Cr) concentration dependence on the visible light photocatalytic activity of SrTiO3 for the photodecomposition of gaseous iso-propyl alcohol (IPA), as well as the photo reduction of water. For the first time co-doping of perovskite SrTiO3 is investigated for co-doping with Cr and Fe metal-ions at Ti substitutional site. Undoped SrTiO3, Cr doped SrTiO3, Fe doped SrTiO3 and co-doped SrTi1-xFe[x/2]Cr[x]O4 (0.01 ≤ x ≤ 0.2) were synthesized for the present study. The optimum concentration shows a maximum photodecomposition activity for IPA, as well as photocatalytic hydrogen generation under visible light (λ > 420 nm). The study on the co-dopant concentration optimization was found to be one of the important ways for fabricating an efficient photocatalyst. The optimum co-dopant concentration seems to yield a favorable density of states in the band gap of SrTiO3, which otherwise may lead to recombination centers.
Abstract
We studied the co-dopant (Fe-Cr) concentration dependence on the visible light photocatalytic activity of SrTiO3 for the photodecomposition of gaseous iso-propyl alcohol (IPA), as well as the photo reduction of water. For the first time co-doping of perovskite SrTiO3 is investigated for co-doping with Cr and Fe metal-ions at Ti substitutional site. Undoped SrTiO3, Cr doped SrTiO3, Fe doped SrTiO3 and co-doped SrTi1-xFe[x/2]Cr[x]O4 (0.01 ≤ x ≤ 0.2) were synthesized for the present study. The optimum concentration shows a maximum photodecomposition activity for IPA, as well as photocatalytic hydrogen generation under visible light (λ > 420 nm). The study on the co-dopant concentration optimization was found to be one of the important ways for fabricating an efficient photocatalyst. The optimum co-dopant concentration seems to yield a favorable density of states in the band gap of SrTiO3, which otherwise may lead to recombination centers.
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