Dataset Information

Photocatalytic H₂ Evolution on TiO₂ Assembled with Ti₃C₂ MXene and Metallic 1T-WS₂ as Co-catalysts.

ABSTRACT: The biggest challenging issue in photocatalysis is efficient separation of the photoinduced carriers and the aggregation of photoexcited electrons on photocatalyst's surface. In this paper, we report that double metallic co-catalysts Ti₃C₂ MXene and metallic octahedral (1T) phase tungsten disulfide (WS₂) act pathways transferring photoexcited electrons in assisting the photocatalytic H₂ evolution. TiO₂ nanosheets were in situ grown on highly conductive Ti₃C₂ MXenes and 1T-WS₂ nanoparticles were then uniformly distributed on TiO₂@Ti₃C₂ composite. Thus, a distinctive 1T-WS₂@TiO₂@Ti₃C₂ composite with double metallic co-catalysts was achieved, and the content of 1T phase reaches 73%. The photocatalytic H₂ evolution performance of 1T-WS₂@TiO₂@Ti₃C₂ composite with an optimized 15 wt% WS₂ ratio is nearly 50 times higher than that of TiO₂ nanosheets because of conductive Ti₃C₂ MXene and 1T-WS₂ resulting in the increase of electron transfer efficiency. Besides, the 1T-WS₂ on the surface of TiO₂@Ti₃C₂ composite enhances the Brunauer-Emmett-Teller surface area and boosts the density of active site.

SUBMITTER: Li Y

PROVIDER: S-EPMC7770731 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature

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Publications

Photocatalytic H2 Evolution on TiO2 Assembled with Ti3C2 MXene and Metallic 1T-WS2 as Co-catalysts.

Li Yujie Y Ding Lei L Yin Shujun S Liang Zhangqian Z Xue Yanjun Y Wang Xinzhen X Cui Hongzhi H Tian Jian J

Nano-micro letters 20191216 1

The biggest challenging issue in photocatalysis is efficient separation of the photoinduced carriers and the aggregation of photoexcited electrons on photocatalyst's surface. In this paper, we report that double metallic co-catalysts Ti3C2 MXene and metallic octahedral (1T) phase tungsten disulfide (WS2) act pathways transferring photoexcited electrons in assisting the photocatalytic H2 evolution. TiO2 nanosheets were in situ grown on highly ...[more]

PMID: 34138075

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Project description:Designing a heterostructure nanoscale catalytic site to facilitate N2 adsorption and photogenerated electron transfer would maximize the potential for photocatalytic activity and N2 reduction reactions. Herein, we have explored the interfacial TiO2 nanograins between the Ti3C2TxMXene-WS2 heterostructure and addressed the beneficial active sites to expand the effective charge transfer rate and promote sonophotocatalytic N2 fixation. Benefiting from the interfacial contact and dual heterostructure interface maximizes the photogenerated carrier separation between WS2 and MXene/TiO2. The sonophotocatalytic activity of the MXene@TiO2/WS2 hybrid, which was assessed by examining the photoreduction of N2 with ultrasonic irradiation, was much higher than that of either sonocatalytic and photocatalytic activity because of the synergistic sonocatalytic effect under photoirradiation. The Schottky junction between the MXene and TiO2 on the hybrid MXene/TiO2-WS2 heterostructure resulted in the sonophotocatalytic performance through effective charge transfer, which is 1.47 and 1.24 times greater than MXene-WS2 for nitrogen fixation and pollutant degradation, respectively. Under the sonophotocatalytic process, the MXene/TiO2-WS2 heterostructure exhibits a decomposition efficiency of 98.9 % over tetracycline in 90 min, which is 5.46, 1.73, and 1.10 times greater than those of sonolysis, sonocatalysis, and photocatalysis, respectively. The production rate of NH3 on MXene/TiO2-WS2 reached 526 μmol g-1h-1, which is 3.17, 3.61, and 1.47 times higher than that of MXene, WS2, and MXene-WS2, respectively. The hybridized structure of MXene-WS2 with interfacial surface oxidized TiO2 nanograins minimizes the band potential and improves photocarrier use efficiency, contributing directly to the remarkable catalytic performance towards N2 photo fixation under visible irradiation under ultrasonic irradiation. This report provides the strategic outcome for the mass carrier transfer rate and reveals a high conversion efficiency in the hybridized heterostructure.

Dataset Information

Photocatalytic H₂ Evolution on TiO₂ Assembled with Ti₃C₂ MXene and Metallic 1T-WS₂ as Co-catalysts.

Publications

Photocatalytic H<sub>2</sub> Evolution on TiO<sub>2</sub> Assembled with Ti<sub>3</sub>C<sub>2</sub> MXene and Metallic 1T-WS<sub>2</sub> as Co-catalysts.

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