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首页> 外文期刊>RSC Advances >Synergistic effect of Ni-Ag-rutile TiO(2)ternary nanocomposite for efficient visible-light-driven photocatalytic activity
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Synergistic effect of Ni-Ag-rutile TiO(2)ternary nanocomposite for efficient visible-light-driven photocatalytic activity

机译：Ni-Ag-rutile TiO（2）三元纳米复合材料进行高效可见光光催化活性的协同作用

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P25 comprising of mixed anatase and rutile phases is known to be highly photocatalytically active compared to the individual phases. Using a facile wet chemical method, we demonstrate a ternary nanocomposite consisting of Ni and Ag nanoparticles, decorated on the surface of XTiO2(X: P25, rutile (R)) as an efficient visible-light-driven photocatalyst. Contrary to the current perspective, RTiO2-based Ni-Ag-RTiO(2)shows the highest activity with the H(2)evolution rate of similar to 86 mu mol g(-1)W(-1)h(-1)@535 nm. Together with quantitative assessment of active Ni, Ag and XTiO(2)in these ternary systems using high energy synchrotron X-ray diffraction, transmission electron microscopy coupled energy dispersive spectroscopy mapping evidences the metal to semiconductor contactviaAg. The robust photocatalytic activity is attributed to the improved visible light absorption, as noted by the observed band edge of similar to 2.67 eV corroborating well with the occurrence of Ti(3+)in Ti 2p XPS. The effective charge separation due to intimate contact between Ni and RTiO(2)viaAg is further evidenced by the plasmon loss peak in Ag 3d XPS. Moreover, density functional theory calculations revealed enhanced adsorption of H(2)on Ti(8)O(16)clusters when both Ag and Ni are simultaneously present, owing to the hybridization of the metal atoms with d orbitals of Ti and p orbitals of O leading to enhanced bonding characteristics, as substantiated by the density of states. Additionally, the variation in the electronegativity in Bader charge analysis indicates the possibility of hydrogen evolution at the Ni sites, in agreement with the experimental observations.
机译：包含混合锐钛矿和金红石相的P25已知相比于各个相是高度光催化活性。使用简便的湿法化学方法，我们证明的三元纳米复合材料由Ni和Ag纳米颗粒的，装饰XTiO2的表面上：作为有效的可见光光催化剂驱动（X P25，金红石（R））。相反到电流的角度来看，基于RTiO2 - 镍 - 银 - RTIO（2）示出了具有H（2）的进化相似率至86亩活性最高摩尔克（-1）W（-1）H（-1） @ 535纳米。在使用高能量同步辐射X射线衍射这些三元体系活性的Ni，Ag和XTiO（2）的定量评估一起，透射电子显微镜耦合的能量色散谱映射能证明该金属到半导体contactviaAg。鲁棒的光催化活性归因于改进的可见光吸收，如通过相似的所观察到的带边缘注意到2.67电子伏特与钛的发生确证阱（3+）的Ti的2p的XPS。由于Ni和RTIO之间的紧密接触的有效的电荷分离（2）viaAg进一步通过在银3D XPS等离子体激元损耗峰证明。此外，密度泛函理论计算对Ti显示增强的H（2）吸附（8）O（16）群集时的Ag和Ni二者同时存在，由于与钛的d轨道和p轨道的金属原子的杂交Ò导致增强的粘结特性，由状态密度为证实。此外，在贝德负责分析的电负性变化表明析氢在镍网站的可能性，与实验观察一致。

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  • 来源
    《RSC Advances》 |2020年第60期|共11页
  • 作者

    Leukkunen Petri M.; Rani Ekta; Devi Assa Aravindh Sasikala; Singh Harishchandra; King Graham; Alatalo Matti; Cao Wei; Huttula Marko;

  • 作者单位

    Univ Oulu Nano &

    Mol Syst Res Unit FIN-90014 Oulu Finland;

    Univ Oulu Nano &

    Mol Syst Res Unit FIN-90014 Oulu Finland;

    Univ Oulu Nano &

    Mol Syst Res Unit FIN-90014 Oulu Finland;

    Univ Oulu Nano &

    Mol Syst Res Unit FIN-90014 Oulu Finland;

    Canadian Light Source 44 Innovat Blvd Saskatoon SK S7N 2V3 Canada;

    Univ Oulu Nano &

    Mol Syst Res Unit FIN-90014 Oulu Finland;

    Univ Oulu Nano &

    Mol Syst Res Unit FIN-90014 Oulu Finland;

    Univ Oulu Nano &

    Mol Syst Res Unit FIN-90014 Oulu Finland;

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