光催化
材料科学
X射线光电子能谱
介孔材料
纳米复合材料
异质结
光致发光
化学工程
纳米颗粒
分解水
催化作用
制氢
纳米技术
光催化分解水
可见光谱
化学
光电子学
有机化学
工程类
作者
Muhammad Zubair,Ingeborg-Helene Svenum,Magnus Rønning,Jia Yang
标识
DOI:10.1016/j.cattod.2018.10.070
摘要
Abstract With the ambition to design a cost-effective and highly stable photocatalyst with improved photocatalytic activity towards H2 generation by water splitting, herein we report a two-step facile synthesis approach for core-shell structure of TiO2-CdS nanocomposites. The synthesized photocatalysts are comprehensively characterized by SEM, XRD, BET, UV–vis DRS, Photoluminescence and XPS to investigate the morphological, crystalline, structural, optical properties and surface analysis. The photocatalytic activity is evaluated by measuring the ability of TiO2-CdS to generate H2 gas by water splitting in the presence of hole scavengers under simulated solar light at AM 1.5G conditions. Our optimized sample TiO2-CdS (3:2) exhibited an enhanced photocatalytic activity by generating 954 μmol g−1 h-1 of hydrogen which is ∼1.4 and ∼1.7 times higher than pure CdS nanoparticles and pure TiO2, respectively. The optimized sample achieved an apparent quantum efficiency of 3.53% along with good stability by generating a similar amount of H2 for 40 consecutive hours. The enhanced photocatalytic activity and stability of the core-shell TiO2-CdS nanocomposite is attributed to the broader solar spectrum absorption, efficient photo-induced charge separation on the interface of TiO2-CdS due to the formation of heterojunction and high surface area with a large fraction of mesopores.
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