New insight into enhanced photocatalytic activity of morphology-dependent TCPP-AGG/RGO/Pt composites
New insight into enhanced photocatalytic activity of morphology-dependent TCPP-AGG/RGO/Pt composites
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对形态依赖性 TCPP-AGG/RGO/Pt 复合材料增强光催化活性的新见解
DOI：
10.1016/j.electacta.2018.06.047
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发表时间：
2018
影响因子：
6.6
通讯作者：
Lu Xiaoquan
中科院分区：
文献类型：
--
作者：
Yao Min;Meng Yao;Mao Xiang;Ning Xingming;Zhang Zhen;Shan Duoliang;Chen Jing;Lu Xiaoquan
卟啉聚集体被认为是开发人工光收集系统的一个有吸引力的候选者。以5,10,15,20 -四-（4-羧基苯基）卟啉（TCPP）为原料，通过表面活性剂辅助自组装反应，可控地制备了不同形态（球形、棒状和片状）的卟啉聚集体，进而合成了三元仿生体系（如卟啉复合材料）。利用扫描电子显微镜（SEM）、原子力显微镜（AFM）和光谱技术对复合材料进行了表征。采用紫外可见光谱和扫描电化学显微镜（UV-vis /SECM）组合技术，记录了特定区域可见光照射下卟啉光催化的SECM接近曲线，识别出形貌依赖的卟啉复合物在ITO表面均匀分布。通过模拟SECM接近曲线，给出了非均相光电子转移率。结果表明，棒状卟啉聚集体复合材料具有最高的光催化效率，其动力学速率为8.624 × 10−2cm s−1，在激发波长469 nm处达到最大。这些发现也得到了污染物（甲基橙）光催化分解试验的证实。结果表明，一维纳米结构有利于电子与空穴的分离和光电子的定向传输。
The porphyrin aggregate is recognized as an attractive candidate for developing artificial light-harvesting systems. Using 5, 10, 15, 20-tetrakis-(4-carboxyphenyl) porphyrin (TCPP), the porphyrin aggregates with different morphologies (sphere, rod and flake) are controllably prepared by the surfactant-assisted self-assembly reaction, and then synthesize the ternary bionic-system (e.g. porphyrin composites). These composites are characterized by scanning-electron microscopy (SEM), atomic force microscope (AFM) and spectroscopic technology. The combinatorial technique consisted of ultraviolet–visible spectroscopy and scanning electrochemical microscopy (UV–vis/SECM) is used to record SECM approach curves of porphyrin photocatalysis under visible light illumination at the specific zones, where morphology-dependent porphyrin composite is recognized to be distributed evenly on ITO surface. Heterogeneous photoelectron transfer rates (keff) are given by simulating SECM approach curves. It is suggested that rod-like porphyrin aggregate composite has highest photocatalytic efficiency with the kinetics rate to be 8.624 × 10−2cm s−1, the largestkeffof which is obtained at the excitation wavelength of 469 nm. These findings are also proved by photocatalytic decomposition test of pollutants (methyl orange). It is indicated that one-dimensional nanostructure is advantageous for separation of electrons and holes and directional transmission of photoelectron.