SiO@α-FeO核壳修饰的RGO纳米复合材料光催化还原与氧化性能的原位漫反射红外傅里叶变换光谱研究

In-situ DRIFT investigation of photocatalytic reduction and oxidation properties of SiO@α-FeO core-shell decorated RGO nanocomposite.

作者信息

Kasimayan Uma, Nadarajan Arjun, Singaravelu Chandra Mohan, Pan Guan-Ting, Kandasamy Jothivenkatachalam, Yang Thomas C-K, Lin Ja-Hon

机构信息

Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei, Taiwan, 106.

Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan, 106.

出版信息

Sci Rep. 2020 Feb 7;10(1):2128. doi: 10.1038/s41598-020-59037-9.

In this work, SiO@α-FeO core-shell decorated RGO nanocomposites were prepared via a simple sol-gel method. The nanocomposites were prepared with different weight percentages (10, 30, and 50 wt %) of the SiO@α-FeO core-shell on RGO, and the effects on the structural and optical properties were identified. The photocatalytic reduction and oxidation properties of the nanocomposites in the gas phase were assessed through the reduction of CO and oxidation of ethanol using in-situ diffuse-reflectance infrared fourier transform spectroscopy (DRIFT). The prepared nanocomposite with (30 wt %) of SiO@α-FeO showed superior photocatalytic activity for the gas phase reduction of CO and oxidation of ethanol. Enhancement in the activity was also perceived when the light irradiation was coupled with thermal treatment. The DRIFT results for the nanocomposites indicate the active chemical conversion kinetics of the redox catalytic effect in the reduction of CO and oxidation of ethanol. Further, the evaluation of photoelectrochemical CO reduction performance of nanocomposites was acquired by linear sweep voltammetry (LSV), and the results showed a significant improvement in the onset-potential (-0.58 V) for the RGO (30 wt %)-SiO@α-FeO nanocomposite.

在本工作中，通过简单的溶胶-凝胶法制备了SiO@α-FeO核壳修饰的RGO纳米复合材料。制备了RGO上具有不同重量百分比（10%、30%和50%）SiO@α-FeO核壳的纳米复合材料，并确定了其对结构和光学性质的影响。通过原位漫反射红外傅里叶变换光谱（DRIFT）对CO的还原和乙醇的氧化来评估纳米复合材料在气相中的光催化还原和氧化性能。制备的含30 wt%SiO@α-FeO的纳米复合材料对气相中CO的还原和乙醇的氧化表现出优异的光催化活性。当光照射与热处理相结合时，也观察到活性增强。纳米复合材料的DRIFT结果表明了在CO还原和乙醇氧化中氧化还原催化作用的活性化学转化动力学。此外，通过线性扫描伏安法（LSV）获得了纳米复合材料光电化学CO还原性能的评估结果，结果表明RGO（30 wt%）-SiO@α-FeO纳米复合材料的起始电位（-0.58 V）有显著改善。