5 results on '"Yu-Duan Wang"'
Search Results
2. Synthesis of Ag2CrO4/SnO2 n–n type heterojunction as a visible light photocatalyst for degradation of rhodamine B
- Author
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Xiu-Guo Sun, Xin Tong, Xiang-Feng Wu, Jun-Zhang Su, Wei-Guang Zhang, Mi Zhang, Jia-Rui Zhang, Yu-duan Wang, Yan-Mei Feng, and Chen-Xu Zhang
- Subjects
Materials science ,Heterojunction ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Photochemistry ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,chemistry ,Chemical bond ,Rhodamine B ,Photocatalysis ,Degradation (geology) ,Nanorod ,Electrical and Electronic Engineering ,0210 nano-technology ,Photodegradation ,Visible spectrum - Abstract
The Ag2CrO4/SnO2 n–n type heterojunction has been fabricated by coupling Ag2CrO4 particles with SnO2 nanorods via an in situ synthetic method. The photocatalytic degradation mechanism of the as-prepared heterojunction has also been discussed. Characterization results revealed that the as-fabricated Ag2CrO4/SnO2 composites could reinforce the photo-degradation competencies for rhodamine B dilute solution compared to pure Ag2CrO4 and SnO2 samples. As the increase in the molar ratios of Ag2CrO4–SnO2, the photocatalytic degradation efficiency appeared to the tendency of first increasing and then decreasing. When it was 4:10, in 90 min, the as-obtained samples possessed the vintage photocatalytic degradation efficiency of 95.8% among of pure SnO2, Ag2CrO4 and the as-prepared composites with various molar ratios, respectively. Furthermore, the Ag2CrO4 and SnO2 were connected via chemical bonds to form the homogenous heterojunction. It could boost the separation and transfer of the photogenerated holes and electrons. In addition, the holes, hydroxyl and superoxide radicals played a major role during the photodegradation process.
- Published
- 2018
3. Boron Nitride Nanoparticles with High Specific Surface Area: Preparation by a Calcination Method and Application in Epoxy Resin
- Author
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Yu Liu, Xin-yue Yang, Xiang-feng Wu, Yi-Jin Wang, Xiao-dong Gong, Hui Li, Yu-duan Wang, Chen-Xu Zhang, Ze-Hua Zhao, and Yang Sun
- Subjects
Materials science ,Polymers and Plastics ,Nanoparticle ,02 engineering and technology ,Porosimetry ,Epoxy ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,chemistry ,law ,Boron nitride ,Specific surface area ,visual_art ,Ultimate tensile strength ,Materials Chemistry ,visual_art.visual_art_medium ,Calcination ,Muffle furnace ,Composite material ,0210 nano-technology - Abstract
Boron nitride nanoparticles were prepared in a muffle furnace at 1000 °C by using commercial available boron nitride flakes and sodium chloride as raw materials. The structure, functional groups, morphology and specific surface area of the as-prepared samples were characterized by X-ray diffracmeter, fourier-transform infrared spectrometer, transmission electron microscope and accelerated surface area/porosimetry system, respectively. In order to evaluate the properties of the as-prepared products, they were mixed with epoxy resin to fabricate polymer-based composites. Experimental results showed that the average size and specific surface area of the as-prepared nanoparticles were about 20 nm and 895.7 m2/g. Moreover, the as-prepared nanoparticles could improve the tensile strength and elongation at break of the epoxy matrix. Both of them were first increased and then decreased with increasing the usage amount of the as-prepared nanoparticles. When the usage amount of the boron nitride nanoparticles was 0.4 wt%, the tensile strength and elongation at break of the composites reached to 71.4 MPa and 22.1%, which were the maximum values of the composites, respectivley. They were increased by 137 and 146% more than those of pure epoxy resin. In addition, the as-prepared fillers could accelerate the solidification of the matrix.
- Published
- 2017
4. A sulfur-rich small molecule as a bifunctional interfacial layer for stable perovskite solar cells with efficiencies exceeding 22%
- Author
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Jiang-Yang Shao, Yu-Wu Zhong, Tian-Ge Sun, Jin-Song Hu, Ming-Hua Li, and Yu-Duan Wang
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Materials science ,Passivation ,Renewable Energy, Sustainability and the Environment ,Energy conversion efficiency ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Sulfur ,0104 chemical sciences ,chemistry.chemical_compound ,X-ray photoelectron spectroscopy ,Chemical engineering ,chemistry ,General Materials Science ,Lewis acids and bases ,Electrical and Electronic Engineering ,0210 nano-technology ,Bifunctional ,Layer (electronics) ,Perovskite (structure) - Abstract
Remarkable progress has been made in perovskite solar cells (PSCs) recently. However, the defects present in the perovskite layer act as non-radiative recombination centers to decrease the stability and restrict the further performance improvement of the device. We report herein a sulfur-rich two-dimensional small molecule, SMe-TATPyr, as a bifunctional layer to efficiently passivate the surface defects of perovskite and facilitate the hole transfer at the perovskite/spiro-OMeTAD interface. X-ray photoelectron spectroscopy analyses show that the sulfur atoms of SMe-TATPyr can passivate the uncoordinated Pb2+ defects and suppress the Pb0 defect formation as Lewis bases. As a result, the power conversion efficiency of PSCs is distinctly increased from 20.4% to 22.3%. Moreover, this simple interfacial modification could effectively enhance the stability of unencapsulated PSCs to retain 95% of the initial efficiency after storage for 1500 h at ambient conditions, in contrast to 70% efficiency retention of the device without SMe-TATPyr under the same conditions.
- Published
- 2021
5. Preparation and characterization of Ag2CrO4/few layer boron nitride hybrids for visible-light-driven photocatalysis
- Author
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Chen-Xu Zhang, Yang Sun, Ze-Hua Zhao, Xin-yue Yang, Hui Li, Yu-duan Wang, Yu Liu, Xiao-dong Gong, Xiang-feng Wu, and Yi-Jin Wang
- Subjects
Materials science ,Diffuse reflectance infrared fourier transform ,Inorganic chemistry ,Nanoparticle ,Bioengineering ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Dielectric spectroscopy ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Boron nitride ,Modeling and Simulation ,Photocatalysis ,Rhodamine B ,General Materials Science ,Charge carrier ,0210 nano-technology ,Visible spectrum - Abstract
Nanosized Ag2CrO4/few layer boron nitride composites were prepared via in situ precipitation method. The crystal structure, morphology, optical properties, and charge carrier behavior were investigated by X-ray diffraction, transmission electrical microscopy, UV-vis diffuse reflectance spectroscopy, and electrochemical impedance spectroscopy, respectively. The photocatalytic activities of the as-prepared hybrids were discussed by degradation of rhodamine B under visible-light irradiation. Experimental results showed that the average size of pure Ag2CrO4 particles was about 20 nm. Moreover, the degradation efficiency of the as-prepared hybrids was first increased and then decreased with increasing the usage amount of few layer boron nitride nanosheets. When it was 10 wt%, in 120 min, the degradation efficiency of the as-prepared hybrids had reached the maximum of 96.7%. It was much higher than 75% of pure Ag2CrO4 nanoparticles. After 3 cycles of the degradation, the efficiency of the as-prepared composites was decreased from 96.7 to 91.8%. Trapping experiment results revealed that holes played a major role during the photocatalysis process. In addition, electrochemical impedance spectroscopy results indicated that few layer boron nitride nanosheets could enhance the separation and transfer of photogenerated electrons and holes.
- Published
- 2017
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