Anchoring ultra-small TiO2 quantum dots onto ultra-thin and large-sized Mxene nanosheets for highly efficient photocatalytic water splitting

Li, Weiming; Zhuang, Chunqiang; Li, Yuanli; Gao, Chunlang; Jiang, Wenshuai; Sun, Zaicheng; Qi, Kezhen

doi:10.1016/j.ceramint.2021.04.192

Cited by 59 publications

(19 citation statements)

References 54 publications

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“…Moreover, various syntheses for 2 of 13 different-dimension MXenes (e.g., quantum nanodots, nanorods, and nanosheets) have been reported [10]. Among all the MXenes, Ti 3 C 2 is one of the most representative and prevalently studied materials in the field of photocatalysis, especially as a co-catalyst, because of the following reasons: (i) Its intrinsically metallic conductivity assures the efficient separation and transfer of photogenerated charge carriers from semiconductors [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Facile Preparation of Highly Active CO2 Reduction (001)TiO2/Ti3C2Tx Photocatalyst from Ti3AlC2 with Less Fluorine

Tan

et al. 2022

Catalysts

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To date, (001)TiO2/Ti3C2Tx hybridized photocatalyst is usually prepared through the complicated treatment of Ti3AlC2 in the presence of corrosive fluorine with a molar ratio of nF:nTi of more than 20. To reduce the use of corrosive fluorine, herein, exploiting beyond the conventional method, we report a facile synthetic method for (001)TiO2/Ti3C2Tx, elaborately using HF as both an etchant for Al elimination and a morphology control agent for the growth of (001)TiO2 nanosheets, with a sharply diminished use of fluorine (nF:nTi = 4:1) and simplified operation procedures. After optimization, the resulting (001)TiO2/Ti3C2Tx heterojunction exhibited markedly high photocatalytic activity with the CO2 reduction rate of 13.45 μmol g−1 h−1, which even surpasses that of P25 (10.95 μmol g−1 h−1), while the photoelectron selectivity to CH4 is approaching 92.84%. The superior photoactivity is interpreted as the fact that Ti3C2Tx with a lower work function induces photoinduced hole transfer and suppresses the charge recombination, thus facilitating the CO2 multi-electron reduction. This study provides a novel and simple synthesis for (001)TiO2/Ti3C2Tx towards sustainable energy transformations.

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Section: Introductionmentioning

confidence: 99%

Facile Preparation of Highly Active CO2 Reduction (001)TiO2/Ti3C2Tx Photocatalyst from Ti3AlC2 with Less Fluorine

Tan

et al. 2022

Catalysts

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“…The photocatalytic reaction rate mainly depends on the reaction rate constant and adsorption coefficient (Hasija et al, 2020). When the adsorption process is the rate-limiting step of the photocatalytic reaction, improving the adsorption performance of the photocatalyst can improve the photocatalytic reaction efficiency (Li et al, 2021a). Combining the photocatalytic activity of MoS 2 with the adsorption performance of the adsorbent, the organic matter adsorbed on the adsorbent can be degraded through photocatalytic action, so as to enhance the purification ability of the adsorbent and prolong the service life of the adsorbent (Zhou et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Molybdenum Sulfide (MoS2)/Ordered Mesoporous Carbon (OMC) Tubular Mesochannel Photocatalyst for Enhanced Photocatalytic Oxidation for Removal of Volatile Organic Compounds (VOCs)

Guan

Zeng

et al. 2022

Front. Chem.

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Air pollutants cause severe problems in urban areas, specifically in terms of toxicological impacts on human health. Therefore, it is urgent to develop an effective, safe, and inexpensive technique to remove these air pollutants. In this study, the MoS2/OMC heterojunction photocatalyst was successfully synthesized by a hydrothermal process and used for improving photocatalytic oxidation performance for removing VOCs. Formaldehyde was used as a model VOC in the gas phase and was removed at room temperature under visible light irradiation. For my research, the microstructure and morphology of the photocatalyst were deeply characterized, and the results indicated that MoS2 were successfully coupled into OMC materials to prepare MoS2/OMC heterojunction photocatalysts. The trend of photocatalytic efficiency for formaldehyde decomposition was MoS2/OMC > MoS2 > OMC. Besides, the MoS2/OMC heterojunction photocatalyst showed an excellent regeneration performance after several recycles, indicating the potential of MoS2/OMC composite as a promising photocatalyst for VOC removal. These results indicated that the photocatalytic reactor containing MoS2/OMC photocatalysts was highly active and stable.

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“…Titania (TiO 2 ) has acquired a huge interest as a potential photocatalyst because of its many advantages, including strong oxidative power, interesting and useful properties, low cost, long-term chemical stability and nontoxicity (Tang et al, 1994;Hamad et al, 2005;Kamat, 2012;Qi et al, 2014). Also due to the unique optoelectronic and photochemical capabilities, TiO 2 nanoparticles have received a lot of attention as photocatalysts for cleaning air/water and in electrolysis of water to make hydrogen (Khan et al 2002;Ao & Lee, 2005;Ni et al, 2007;Cho et al, 2011;Qi et al, 2014Qi et al, , 2017Qi, Selvaraj et al, 2016;Qi, Zasada et al, 2016;Qi, Liu & Qui et al, 2018;Qi, Liu, Chen et al, 2018;Li et al, 2021). In addition to its photocatalytic usage, it has also been utilized in various other industrial applications such as solar cells, sensors, decontamination and environmental purification systems (Nogueira & Jardim, 1996;Paz, 2010;Roy et al, 2010;Nisar et al, 2013;.…”

Section: Introductionmentioning

confidence: 99%

Formation and crystallization of TiO₂ nanostructures on various surfaces

Jaffari¹,

Hussain²,

Iqbal³

et al. 2022

Acta Crystallogr Sect B

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A comparative study of the synthesis of TiO2 nanorods on fluorine-doped tin oxide (FTO) glass, Si, SiO2, Si/Ta, Si/TiN, Si/TiN/Ti and Si/HFO2 substrates by hydrothermal reaction is presented. Detailed analysis on the growth of TiO2 on pre-annealed Si/TiN/Ti and HfO2 (HFO) surfaces is also given. For Si/TiN/Ti, a pre-annealing procedure led to the transformation of Ti to a TiO2 layer which acts as a seed for aligned growth of TiO2 nanorods. In contrast, Si/HFO does not provide a nucleation site for the formation of aligned nanorods. Various samples were prepared by varying the synthesis conditions, i.e. pre- and post-annealing temperatures and hydrothermal reaction time to figure out the optimum conditions which lead to unidirectional and highly aligned nanorods. X-ray diffraction, scanning electron microscopy, ultraviolet–visible spectroscopy and Raman spectroscopy were used to study structural, morphological and optical properties of synthesized samples. It is found that TiO2 nanorods exhibit a rutile phase on the Si/Ti/TiN and Si/HFO substrates, but highly oriented vertical growth of nanorods has been observed only on pre-annealed Si/TiN/Ti substrates. On the other hand, TiO2 nanorods form dandelion-like structures on Si/HFO substrates. Growth of vertically oriented TiO2 nanorods on Si/TiN/Ti is attributed to the TiO2 seed layer which forms after the process of pre-annealing of substrates at a suitable temperature. Variation in hydrothermal reaction time and post-annealing temperature brings further improvement in crystallinity and morphology of nanorods. This work shows that the pre-annealed Si/TiN/Ti substrate is the optimal choice to achieve vertically oriented, highly aligned TiO2 nanorods.

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Anchoring ultra-small TiO2 quantum dots onto ultra-thin and large-sized Mxene nanosheets for highly efficient photocatalytic water splitting

Cited by 59 publications

References 54 publications

Facile Preparation of Highly Active CO2 Reduction (001)TiO2/Ti3C2Tx Photocatalyst from Ti3AlC2 with Less Fluorine

Facile Preparation of Highly Active CO2 Reduction (001)TiO2/Ti3C2Tx Photocatalyst from Ti3AlC2 with Less Fluorine

Molybdenum Sulfide (MoS2)/Ordered Mesoporous Carbon (OMC) Tubular Mesochannel Photocatalyst for Enhanced Photocatalytic Oxidation for Removal of Volatile Organic Compounds (VOCs)

Formation and crystallization of TiO₂ nanostructures on various surfaces

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Anchoring ultra-small TiO2 quantum dots onto ultra-thin and large-sized Mxene nanosheets for highly efficient photocatalytic water splitting

Cited by 59 publications

References 54 publications

Facile Preparation of Highly Active CO2 Reduction (001)TiO2/Ti3C2Tx Photocatalyst from Ti3AlC2 with Less Fluorine

Facile Preparation of Highly Active CO2 Reduction (001)TiO2/Ti3C2Tx Photocatalyst from Ti3AlC2 with Less Fluorine

Molybdenum Sulfide (MoS2)/Ordered Mesoporous Carbon (OMC) Tubular Mesochannel Photocatalyst for Enhanced Photocatalytic Oxidation for Removal of Volatile Organic Compounds (VOCs)

Formation and crystallization of TiO2 nanostructures on various surfaces

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Formation and crystallization of TiO₂ nanostructures on various surfaces