Journal of CO2 Utilization
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2019
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IF 5.189
Shanshan Chai,Yong Men,Jinguo Wang,Shuang Liu,Qiaoling Song,Wei An,Gunther Kolb
Catalytic reduction of CO 2 to methane has been recognized as one of the most important strategic reactions to produce highly valuable chemicals and for storage of renewable energy (power-to-gas). This study demonstrates a crystal facet-dependent catalytic reduction of CO 2 to CH 4 on ruthenium nanoparticles deposited over TiO 2 nanocrystal with exposed (001) and (101) facets. Compared with TiO 2 (101) nanocrystal with the same Ru loading, Ru nanoparticles supported by TiO 2 (001) exhibited a highly enhanced CO 2 conversion rate and significantly improved methanation reactivity, along with a considerable durability. The physicochemical properties of the samples were characterized by HR-TEM, XRD, BET, FT-IR, UV–vis, Raman, ICP, and temperature-programmed reaction with CO 2 , and CO 2 + H 2 . In view of the difference in catalytic activity and the physicochemical properties of the supported Ru/TiO 2 catalysts, the results uncovered that the nature of the catalyst support of Ru/TiO 2 strongly affected the dispersion of Ru species and the synergistic effect between Ru and underlying TiO 2 supporting materials due to the strong metal-support interaction, and thus affected their capability to activate CO 2 and determined the catalytic activity for CO 2 methanation. Our work demonstrated the important role of the exposed crystal facets of the underlying support and the resulting Ru particle which had a large effect on CO 2 methanation.
研究领域:
催化化学
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材料科学
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环境科学
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产品关联
DOI
高影响因子
RSC Advances
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2022
·Vol. 12
·期 55
·35905-35922
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IF 4.036
Liyan Wang,Zhiqiang Miao,Fei Bi,Shanshan Xiao,Li Zhao,Yongtao Li,Lingwei Kong,Yingqi Li,Jingxiu Yang,Xuejian Zhang,Guangqing Gai
BiOCl hierarchical microspheres assembled from nanosheets with exposed {001} facets were successfully synthesized using PEG-2000 as template by a one-pot room-temperature hydrolysis method. The PEG-modified BiOCl photocatalyst exhibits a significantly enhanced RhB photosensitized degradation activity under visible light. After 10 min white LED irradiation, the degradation efficiency of RhB by the PEG-modified BiOCl sample S0.07 reaches 99.5%. The degradation rate constant of the PEG-modified sample S0.07 over RhB is 0.4568 min−1, which is 6.76 times that of the unmodified sample S0 (0.0676 min−1). After 4 min of xenon lamp (λ ≥ 420 nm) irradiation, the degradation rate of RhB by S0.07 is almost 100%. The exposed {001} facets with surface defects contribute to the superior adsorption capacity of BiOCl towards RhB, which immensely accelerates the electron transfer efficiency from the excited RhB into the conduction band of BiOCl, forming superoxide radical (˙O2−) active species to degrade the pollutants. Moreover, the superior RhB-sensitized BiOCl system provides high photocatalytic degradation activity over MO. This work provides a facile and efficient BiOCl synthesis method that is conducive to large-scale production and simultaneously opens up new ideas for the synthesis of other photocatalysts.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 22
·8551-8556
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IF 3.069
Qiqian Gao,Xiaojuan Sun,Xijia Yang,Liying Wang,Xuesong Li,Xueyu Zhang,Lianfeng Duan,Wei Lü
A key point for constructing quantum dot-sensitized solar cells (QDSSCs) with high efficiency is to improve the utilization of sunlight. While various TiO2 morphologies such as nanoparticles, nanosheets, nanotubes and nanorods have been used as photoanodes of QDSSCs for improving cell performance, these investigations are generally focused on a single morphology of TiO2. Herein, a combined photoanode structure based on TiO2 nanoparticles and {001}-faceted TiO2 nanosheets have been designed, which exhibits improvement in cell performance. Owing to the strong light scattering and fast electron transfer ability of TiO2 nanosheets, an optimal power conversion efficiency of 4.98% with a short circuit current density (Jsc) of 17.57 mA cm−2, an open circuit voltage (Voc) of 0.63 V and a fill factor (FF) of 0.45 is achieved compared to the TiO2 nanoparticle photoanode (3.61%). The present work offers a feasible method towards improving the efficiency of QDSSCs.
研究领域:
材料科学
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太阳能
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纳米技术
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Xu Yan,Zipeng Xing,Yan Cao,Mengqiao Hu,Zhenzi Li,Xiaoyan Wu,Qi Zhu,Shilin Yang,Wei Zhou
In-situ C-N-S-tridoped single crystal black TiO 2 nanosheets with exposed {001} facets are successfully fabricated via a facile hydrothermal method combined with an in-situ solid-state chemical reduction approach, followed by calcination at 450 °C. The crystal structure, crystallinity, morphology and composition of the as-prepared samples are investigated through X-ray diffraction, Raman, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectroscopy, respectively. The results suggest that the obtained C-N-S-tridoped single crystal black TiO 2 nanosheets exhibit uniform nanosheet-like structure with exposed {001} facets and average length of ∼300–400 nm, thickness of ∼20 nm. The visible-light photocatalytic degradation rate of methyl orange is up to 92.13%, and photocatalytic hydrogen evolution is 149.7 μmol h −1 g −1 . The excellent photocatalytic activity can be ascribed to the synergetic effect of surface heterojunction between {001} and {101} facets, the C-N-S-tridoping, and the formed Ti 3+ species in photocatalyst, which can not only favor the visible-light absorption but also facilitate the separation and transfer of photogenerated charges.
研究领域:
材料科学
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化学
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纳米技术
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光催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）