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The enhancement of photocatalytic performance of SrTiO₃ nanoparticles via combining with carbon quantum dots.

ABSTRACT: Carbon quantum dots were prepared by a simple chemical process using activated carbon as carbon source. The as-prepared carbon quantum dots are fine with a narrow size distribution and show excellent hydrophilicity. The carbon quantum dots were combined with SrTiO₃ nanoparticles through a simple impregnation process to obtain a carbon quantum dots/SrTiO₃ nanocomposite. The photocatalytic reaction rate of carbon quantum dots/SrTiO₃ nanocomposite is about 5.5 times as large as that of pure SrTiO₃ in the degradation of rhodamine B under sunlight irradiation. The enhanced performance in the degradation of rhodamine B may be attributed to the interfacial transfer of photogenerated electrons from SrTiO₃ to carbon quantum dots, leading to effective charge separation in SrTiO₃. Carbon quantum dots show potential applications in high-efficiency photocatalyst design.

SUBMITTER: Ren H

PROVIDER: S-EPMC9080776 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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The enhancement of photocatalytic performance of SrTiO3 nanoparticles via combining with carbon quantum dots.

Ren Haitao H Ge Lin L Guo Qian Q Li Lu L Hu Guangkuo G Li Jiangong J

RSC advances 20180501 36

Carbon quantum dots were prepared by a simple chemical process using activated carbon as carbon source. The as-prepared carbon quantum dots are fine with a narrow size distribution and show excellent hydrophilicity. The carbon quantum dots were combined with SrTiO3 nanoparticles through a simple impregnation process to obtain a carbon quantum dots/SrTiO3 nanocomposite. The photocatalytic reaction rate of carbon quantum dots/SrTiO3 nanocomposite is about 5.5 times ...[more]

PMID: 35541666

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Project description:By photodeposition of CrOx on SrTiO3-based semiconductors doped with aliovalent Mg(II) and functionalized with Ni/NiOx catalytic nanoparticles (economically significantly more viable than commonly used Rh catalysts), an increase in apparent quantum yield (AQYs) from ∼10 to 26% in overall water splitting was obtained. More importantly, deposition of CrOx also significantly enhances the stability of Ni/NiO nanoparticles in the production of hydrogen, allowing sustained operation, even in intermittent cycles of illumination. In situ elemental analysis of the water constituents during or after photocatalysis by inductively coupled plasma mass spectrometry/optical emission spectrometry shows that after CrOx deposition, dissolution of Ni ions from Ni/NiOx-Mg:SrTiO3 is significantly suppressed, in agreement with the stabilizing effect observed, when both Mg dopant and CrOx are present. State-of-the-art electron microscopy and energy-dispersive X-ray spectroscopy (EDX) and electron energy-loss spectroscopy (EELS) analyses demonstrate that upon preparation, CrOx is photodeposited in the vicinity of several, but not all, Ni/NiOx particles. This implies the formation of a Ni-Cr mixed metal oxide, which is highly effective in water reduction. Inhomogeneities in the interfacial contact, evident from differences in contact angles between Ni/NiOx particles and the Mg:SrTiO3 semiconductor, likely affect the probability of reduction of Cr(VI) species during synthesis by photodeposition, explaining the observed inhomogeneity in the spatial CrOx distribution. Furthermore, by comparison with undoped SrTiO3, Mg-doping appears essential to provide such favorable interfacial contact and to establish the beneficial effect of CrOx. This study suggests that the performance of semiconductors can be significantly improved if inhomogeneities in interfacial contact between semiconductors and highly effective catalytic nanoparticles can be resolved by (surface) doping and improved synthesis protocols.

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The enhancement of photocatalytic performance of SrTiO₃ nanoparticles via combining with carbon quantum dots.

Publications

The enhancement of photocatalytic performance of SrTiO<sub>3</sub> nanoparticles <i>via</i> combining with carbon quantum dots.

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