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首页> 外文期刊>RSC Advances >Synergistic effect of Ni–Ag–rutile TiO2 ternary nanocomposite for efficient visible-light-driven photocatalytic activity
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Synergistic effect of Ni–Ag–rutile TiO2 ternary nanocomposite for efficient visible-light-driven photocatalytic activity

机译：Ni-Ag - 金红石TiO2三元纳米复合材料进行高效可见光触发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 XTiO _(2) (X: P25, rutile (R)) as an efficient visible-light-driven photocatalyst. Contrary to the current perspective, RTiO _(2) -based Ni–Ag–RTiO _(2) shows the highest activity with the H _(2) evolution rate of ～86 μmol 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 contact via Ag. The robust photocatalytic activity is attributed to the improved visible light absorption, as noted by the observed band edge of ～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) via Ag 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：已知包含混合锐钛矿和金红石相的P25与个体相比高度光催化活性。使用容易湿化学方法，我们证明了由Ni和Ag纳米颗粒组成的三元纳米复合物，装饰在XTiO _（2）（X：P25，金红石（R）的表面上，作为高效的可见光催化的光催化剂。与当前的角度来看，基于Ni-AG-RTIO _（2）的RTIO _（2）显示最高的活性，H _（2）进化速率为〜86μmolg〜（α1）w〜（？1 ）H〜（？1）@ 535 nm。使用高能同步X射线衍射在这些三元系统中的有源NI，AG和XTIO _（2）的定量评估，透射电子显微镜耦合能量色散光谱映射通过Ag证明金属至半导体接触。鲁棒的光催化活性归因于改善的可见光吸收，如图2pp XPS中的Ti〜（3+）的发生率〜2.67eV的〜2.67eV的频带良好。由于AG 3D XPS中的等离子体损耗峰值进一步证明了由于Ni和RtiO _（2）之间的紧密接触而导致的有效电荷分离。此外，由于金属原子与Ti和Ti的D轨道的杂交同时存在，揭示了Ti _（2）在Ti _（2）上的H _（2）上的H_（2）的增强吸附。 o的P轨道导致增强的粘合特性，如国家密度所证实。另外，较糟糕的电荷分析中的电负性的变化表明，与实验观察结果一致，表明NI位点的氢气进化的可能性。

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