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学者姓名：魏笑峰
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Abstract ：
Ammonia is a carbon-free hydrogen carrier, and development of non-noble metal catalyst to decompose ammonia into hydrogen is desirable for practical applications. However, the metal catalyst is challenged by the sintering of metal particles under high-temperature reaction conditions. In this study, a series of Li-, Al-, and Co-containing hydrotalcite-like compounds (HTlc) were synthesized by co-precipitation and used as precursors to prepare well-dispersed and thermally stable Co nanoparticle catalysts for ammonia decomposition. The obtained precursors and catalysts were characterized by means of X-ray powder diffraction (XRD), temperature-programmed reduction (H-2-TPR), X-ray photoelectron spectroscopy (XPS), high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), and so on. All of the precursors formed hydrotalcite-like phase, which consisted of Li-Al-(Co) HTlc and/or Co-Al HTlc dependent on the Co content. Upon calcination at 500 degrees C, HTlc decomposed into an Al-substituted Co3O4 spinel oxide, as confirmed by two distinctly separated reduction steps in H-2-TPR. Following reduction at 700 degrees C, well-dispersed Co metal nanoparticles with an average particle size of similar to 9.2-12.4 nm were obtained. It was suggested that the incorporation of Al3+ into Co3O4 led to a strong interaction between cobalt and aluminum, which suppressed the crystal growth of Co3O4 and the sintering of Co metal during the thermal treatments, resulting in good Co dispersion. The optimal LiAlCo(1.5) catalyst showed superior activity than that prepared by impregnation method, giving almost complete conversion of ammonia at 575 degrees C under a space velocity of 5,000 mL g(cat)(-1) h(-1). More importantly, this catalyst maintained stable activity at 625 degrees C for 100 h, exhibiting high stability and sintering resistance. The good catalytic performance was attributed to the high Co metal dispersion and strong metal-support interaction benefiting from the uniform distribution of cobalt in the HTlc precursor. These results demonstrate the applicability of HTlc to the preparation of metal catalysts with improved dispersion and thermal stability.
Keyword ：
Catalytic ammonia decomposition Catalytic ammonia decomposition Cobalt catalyst Cobalt catalyst Hydrogen production Hydrogen production Hydrotalcite-like compounds Hydrotalcite-like compounds
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| GB/T 7714 | Wei, Xiaofeng , Su, Jiaxin , Ji, Yuyin et al. Hydrotalcite-derived well-dispersed and thermally stable cobalt nanoparticle catalyst for ammonia decomposition [J]. | MOLECULAR CATALYSIS , 2025 , 572 . |
| MLA | Wei, Xiaofeng et al. "Hydrotalcite-derived well-dispersed and thermally stable cobalt nanoparticle catalyst for ammonia decomposition" . | MOLECULAR CATALYSIS 572 (2025) . |
| APA | Wei, Xiaofeng , Su, Jiaxin , Ji, Yuyin , Huang, Hongyang , Li, Dalin , Fang, Huihuang et al. Hydrotalcite-derived well-dispersed and thermally stable cobalt nanoparticle catalyst for ammonia decomposition . | MOLECULAR CATALYSIS , 2025 , 572 . |
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Al-doped Co3O4 and CoO are prepared from Co-Al hydrotalcite by calcination in air and N-2 atmospheres, and characterized by TG-DTA, XRD, SEM, N-2 adsorption, Raman, XPS, and H-2-TPR. Co-Al hydrotalcite is oxidized to Co(Co,Al)(2)O-4 in air accompanying with the collapse of layered structure, while in N-2 it decomposes to Co(Al)O that remains the plate morphology of hydrotalcite. In both cases, Al3+ is doped into the lattice of cobalt oxides, leading to marked changes in the crystal size, surface state, and reducibility. Especially, Al-doped CoO shows smaller crystal size (4.1 nm), larger surface area (172 m(2) g(-1)), and higher degree of structural disorder than Al doped Co3O4. Meanwhile, the Al-doped cobalt oxides show different reducibilities to those of Co3O4 and CoO, indicating a strong interaction between cobalt and aluminum. The N-2-calcined sample exhibits higher activity for benzene combustion than the air-calcined sample as well as a relatively good stability during heating/cooling cycles and a good long-time durability. Under the reaction atmosphere, Co(Al)O is transferred to Co(Co,Al)(2)O-4. The resulting Co(Co,Al)(2)O-4 remains the original plate morphology and textural property and presents abundant surface adsorbed oxygen species, which accounts for its high activity.
Keyword ：
Benzene Benzene Catalytic combustion Catalytic combustion Cobalt oxide Cobalt oxide Hydrotalcite-like compounds Hydrotalcite-like compounds Volatile organic compounds Volatile organic compounds
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| GB/T 7714 | Wan, Chunsheng , Wei, Xiaofeng , Cai, Guohui et al. Hydrotalcite-derived aluminum-doped cobalt oxides for catalytic benzene combustion: Effect of calcination atmosphere [J]. | MOLECULAR CATALYSIS , 2022 , 520 . |
| MLA | Wan, Chunsheng et al. "Hydrotalcite-derived aluminum-doped cobalt oxides for catalytic benzene combustion: Effect of calcination atmosphere" . | MOLECULAR CATALYSIS 520 (2022) . |
| APA | Wan, Chunsheng , Wei, Xiaofeng , Cai, Guohui , Li, Dalin , Zhan, Yingying , Xiao, Yihong et al. Hydrotalcite-derived aluminum-doped cobalt oxides for catalytic benzene combustion: Effect of calcination atmosphere . | MOLECULAR CATALYSIS , 2022 , 520 . |
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Carbon-based fluorescent security labels are effective methods to prevent counterfeiting. However, the properties of poor optical stability, complex and energy-consuming synthesis processes and weak bonding with substrates of carbon-based fluorescent materials limit their application prospects. Here, a novel in situ fluorescent patterning strategy is developed to achieve covert, chemically stable and solvent-tolerant cellulose-based security labels by UV exposure. The unsaturated double bonds as the origin of the fluorescence were generated during the photodegradation process under UV exposure. The fluorescent emission of cellulose-based materials reveals excellent stability under acidic, alkaline, reducing, oxidizing and non-polar solvent environments. These advantages give the cellulose nanofiber based security label fantastic potential applications.
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| GB/T 7714 | Cheng, Hongrui , Wei, Xiaofeng , Qiu, Haijiang et al. Chemically stable fluorescent anti-counterfeiting labels achieved by UV-induced photolysis of nanocellulose [J]. | RSC ADVANCES , 2021 , 11 (30) : 18381-18386 . |
| MLA | Cheng, Hongrui et al. "Chemically stable fluorescent anti-counterfeiting labels achieved by UV-induced photolysis of nanocellulose" . | RSC ADVANCES 11 . 30 (2021) : 18381-18386 . |
| APA | Cheng, Hongrui , Wei, Xiaofeng , Qiu, Haijiang , Wang, Wensong , Su, Wenyue , Zheng, Yuanhui . Chemically stable fluorescent anti-counterfeiting labels achieved by UV-induced photolysis of nanocellulose . | RSC ADVANCES , 2021 , 11 (30) , 18381-18386 . |
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Cadmium sulfide (CdS) as one of the most common visible-light-responsive photocatalysts has been widely investigated for hydrogen generation. However, its low solar-hydrogen conversion efficiency caused by fast carrier recombination and poor catalytic activity hinders its practical applications. To address this issue, we develop a novel and highly efficient nickel-cobalt phosphide and phosphate cocatalyst-modified CdS (NiCoP/CdS/NiCoPi) photocatalyst for hydrogen evolution. The dual-cocatalysts were simultaneously deposited on CdS during one phosphating step by using sodium hypophosphate as the phosphorus source. After the loading of the dual-cocatalysts, the photocurrent of CdS significantly increased, while its electrical impedance and photoluminescence emission dramatically decreased, which indicates the enhancement of charge carrier separation. It was proposed that the NiCoP cocatalyst accepts electrons and promotes hydrogen evolution, while the NiCoPi cocatalyst donates electrons and accelerates the oxidation of sacrificial agents (e.g., lactic acid). Consequently, the visible-light-driven hydrogen evolution of this composite photocatalyst greatly improved. The dual-cocatalyst-modified CdS with a loading content of 5 mol % showed a high hydrogen evolution rate of 80.8 mmol.g(-1).h(-1), which was 202 times higher than that of bare CdS (0.4 mmol.g(-1).h(-1)). This is the highest enhancement factor for metal phosphide-modified CdS photocatalysts. It also exhibited remarkable stability in a continuous photocatalytic test with a total reaction time of 24 h.
Keyword ：
cadmium sulfide cadmium sulfide double heterojunctions double heterojunctions phosphate phosphate phosphide phosphide photocatalytic hydrogen evolution photocatalytic hydrogen evolution
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| GB/T 7714 | Zhao, Yi , Lu, Yongfeng , Chen, Lu et al. Redox Dual-Cocatalyst-Modified CdS Double-Heterojunction Photocatalysts for Efficient Hydrogen Production [J]. | ACS APPLIED MATERIALS & INTERFACES , 2020 , 12 (41) : 46073-46083 . |
| MLA | Zhao, Yi et al. "Redox Dual-Cocatalyst-Modified CdS Double-Heterojunction Photocatalysts for Efficient Hydrogen Production" . | ACS APPLIED MATERIALS & INTERFACES 12 . 41 (2020) : 46073-46083 . |
| APA | Zhao, Yi , Lu, Yongfeng , Chen, Lu , Wei, Xiaofeng , Zhu, Jiefang , Zheng, Yuanhui . Redox Dual-Cocatalyst-Modified CdS Double-Heterojunction Photocatalysts for Efficient Hydrogen Production . | ACS APPLIED MATERIALS & INTERFACES , 2020 , 12 (41) , 46073-46083 . |
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Fabricating electron transport layers at low temperatures is challenging but highly desired in the field of flexible perovskite solar cells (f-PSCs). In this study, highly uniform cerium oxide (CeOx) films prepared by the UV-O(3)treatment have been successfully applied as the electron transport layer (ETL) in methylammonium lead halide (CH3NH3PbI3) perovskite-based f-PSCs. Under AM 1.5 G sunlight with 100 mW cm(-2), these cells exhibited an open-circuit voltage (V-oc) of 0.98 V, a short-circuit current density (J(sc)) of 19.42 mA cm(-2), a fill factor (FF) of 0.72 and power conversion efficiency (PCE) of 14.63%. The PCE was much higher than that of the control planar CeOxETL (PCE similar to 9.08%) prepared at a low temperature (80 degrees C) without the UV-O(3)treatment, and this was ascribed to the improved CeO(x)film, enhanced light absorption and suppressed charge recombination. The cells that bend at 15 mm of radius showed excellent stability with less than 10% reduction in PCE after 500 cycles of repeated bending at ambient temperature. The charge-transmission kinetic parameters and long-term stability of the CeOx-based f-PSCs were analyzed as well.
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| GB/T 7714 | Pang, Aiying , Li, Jinlong , Wei, Xiao-Feng et al. UV-O-3 treated annealing-free cerium oxide as electron transport layers in flexible planar perovskite solar cells [J]. | NANOSCALE ADVANCES , 2020 , 2 (9) : 4062-4069 . |
| MLA | Pang, Aiying et al. "UV-O-3 treated annealing-free cerium oxide as electron transport layers in flexible planar perovskite solar cells" . | NANOSCALE ADVANCES 2 . 9 (2020) : 4062-4069 . |
| APA | Pang, Aiying , Li, Jinlong , Wei, Xiao-Feng , Ruan, Zhi-Wu , Yang, Ming , Chen, Zhong-Ning . UV-O-3 treated annealing-free cerium oxide as electron transport layers in flexible planar perovskite solar cells . | NANOSCALE ADVANCES , 2020 , 2 (9) , 4062-4069 . |
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Photocatalytic hydrogen generation will benefit from the realization of more active but less expensive cocatalysts compared with noble metal counterparts. Herein we developed a universal vapor deposition method that selectively uses the thermal decomposition products of sodium hypophosphite as a phosphorus source for the fabrication of inevensive and highly efficient metal phosphate (MPi) modified CdS nanorods. We find that the modification with a bimetal phosphate (i.e., S wt % NiCoPi) leads to an activity enhancement by a factor of approximately 52 in boosting visible-light-driven hydrogen evolution relative to the pristine CdS nanorods. The photocatalyst exhibits a high hydrogen generation rate of 13.44 mmol.g(-1).h(-1), which is much higher than that of its single metal counterparts (NiPi, 8.70 mmol.g(-1).h(-1); CoPi, 5.79 mmol.g(-1).h(-1)) and 1 wt % Pt modified CdS (1.33 mmol.g(-1).h(-1)). Its apparent quantum efficiency reaches 23.5% at 420 nm. Furthermore, it also shows remarkable photostability for eight consecutive cycles of photocatalytic activity tests with total reaction time of 24 h. The excellent photocatalytic performance of the photocatalyst is believed to be associated with the in situ formed (NiCoP)-Co-I and NiCo(III)Pi cocatalysts, which not only play an important role in photogenerated charge separation but also provide highly active catalytic reaction sites for the corresponding hydrogen evolution reaction and the sacrificial agent oxidation reaction.
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| GB/T 7714 | Chen, Lu , Zhao, Yi , Yang, Jingyao et al. New Versatile Synthetic Route for the Preparation of Metal Phosphate Decorated Hydrogen Evolution Photocatalysts [J]. | INORGANIC CHEMISTRY , 2020 , 59 (2) : 1566-1575 . |
| MLA | Chen, Lu et al. "New Versatile Synthetic Route for the Preparation of Metal Phosphate Decorated Hydrogen Evolution Photocatalysts" . | INORGANIC CHEMISTRY 59 . 2 (2020) : 1566-1575 . |
| APA | Chen, Lu , Zhao, Yi , Yang, Jingyao , Liu, Dan , Wei, Xiaofeng , Wang, Xuxu et al. New Versatile Synthetic Route for the Preparation of Metal Phosphate Decorated Hydrogen Evolution Photocatalysts . | INORGANIC CHEMISTRY , 2020 , 59 (2) , 1566-1575 . |
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本发明公开了一种催化燃烧净化工艺及其装置。该工艺和装置首先将有机废气与空气和/或氧气混合，可根据后续催化燃烧温度的需求，灵活调控两者间的混合比例，不但保证了混合气中有机废气浓度在爆炸极限之外，更重要地在于调控了后续催化燃烧温度，杜绝了催化燃烧段的飞温现象；接着将混合气分为两部分，一部分进行催化燃烧，剩余部分与各级催化燃烧段出口的混合气进行换热，通过上述方式，能及时并灵活地调整两部分的量，并利用剩余部分维持进入下级催化燃烧的混合气的温度，最终使催化燃烧能平稳进行，防止了飞温现象发生。
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| GB/T 7714 | 肖益鸿 , 蔡国辉 , 郑勇 et al. 一种催化燃烧净化工艺及其装置 : CN201710560961.1[P]. | 2017/7/11 . |
| MLA | 肖益鸿 et al. "一种催化燃烧净化工艺及其装置" : CN201710560961.1. | 2017/7/11 . |
| APA | 肖益鸿 , 蔡国辉 , 郑勇 , 江莉龙 , 林科 , 钟富兰 et al. 一种催化燃烧净化工艺及其装置 : CN201710560961.1. | 2017/7/11 . |
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Mixed metal oxides Co5 - xCuxAl (x = 0-05) were prepared from Co-Cu-Al layered double hydroxides (LDHs) and tested for benzene total oxidation. By calcination, Co-Cu-Al LDHs were mainly transformed to (Co, Cu)(Co, Al)(2)O-4 spinels, where both Cu2+ and Al3+ cations were incorporated into the spinel structure. The incorporation of Cu significantly improved the Co oxide reducibility and remarkably enhanced the light-off activity as well as the total conversion activity, indicative a strong interaction between Cu2+ and Co3+ active sites. The optimum Co4.75Cu0.25Al spinel mixed oxide was comparable with a 03%Pd/gamma-Al2O3 catalyst, highlighting the promoting effect of structural modification with Cu. (C) 2016 Elsevier B.V. All rights reserved.
Keyword ：
Catalytic total oxidation Catalytic total oxidation Cobalt oxide Cobalt oxide Layered double hydroxides Layered double hydroxides Mixed metal oxides Mixed metal oxides Volatile organic compounds Volatile organic compounds
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| GB/T 7714 | Li, Dalin , Fan, Yanyu , Ding, Yuanyuan et al. Preparation of cobalt-copper-aluminum spinel mixed oxides from layered double hydroxides for total oxidation of benzene [J]. | CATALYSIS COMMUNICATIONS , 2017 , 88 : 60-63 . |
| MLA | Li, Dalin et al. "Preparation of cobalt-copper-aluminum spinel mixed oxides from layered double hydroxides for total oxidation of benzene" . | CATALYSIS COMMUNICATIONS 88 (2017) : 60-63 . |
| APA | Li, Dalin , Fan, Yanyu , Ding, Yuanyuan , Wei, Xiaofeng , Xiao, Yihong . Preparation of cobalt-copper-aluminum spinel mixed oxides from layered double hydroxides for total oxidation of benzene . | CATALYSIS COMMUNICATIONS , 2017 , 88 , 60-63 . |
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以聚乙二醇(PEG)作为分散剂,采用共沉淀法合成La-Co-O复合氧化物,考察添加不同分子量的PEG(0,2 000,6 000,20 000g·mol~(-1))对复合氧化物的物化性质及苯完全氧化性能的影响。采用N_2物理吸附、XRD、SEM、H_2-TPR、O_2-TPD和XPS进行催化剂表征。苯完全氧化反应结果显示催化剂活性顺序为LCO-PEG6000>LCO>LCO-PG20000>LCO-PG2000,LCO-PEG6000催化剂在383℃时对苯的转化率达到99%,比LCO低126℃。N_2物理吸附实验表明所制备的样品的SBET均为9~10m·g~(-1)。XRD分析显示合成的催化剂...
Keyword ：
LaCoO3 LaCoO3 催化燃烧 催化燃烧 共沉淀法 共沉淀法 复合氧化物 复合氧化物 聚乙二醇 聚乙二醇 苯完全氧化 苯完全氧化
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| GB/T 7714 | 魏笑峰 , 李达林 , 肖益鸿 et al. 聚乙二醇辅助下的La-Co-O复合氧化物合成及其对苯的完全氧化性能研究（英文） [J]. | 光谱学与光谱分析 , 2016 , 36 (09) : 3062-3067 . |
| MLA | 魏笑峰 et al. "聚乙二醇辅助下的La-Co-O复合氧化物合成及其对苯的完全氧化性能研究（英文）" . | 光谱学与光谱分析 36 . 09 (2016) : 3062-3067 . |
| APA | 魏笑峰 , 李达林 , 肖益鸿 , 蔡国辉 , 戴武 , 谢增鸿 et al. 聚乙二醇辅助下的La-Co-O复合氧化物合成及其对苯的完全氧化性能研究（英文） . | 光谱学与光谱分析 , 2016 , 36 (09) , 3062-3067 . |
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The influence of the preparation methods of Co-Al layered double hydroxides (LDHs) on the structural and catalytic properties of Co-Al mixed oxides for benzene total oxidation was investigated. Various Co-Al LDHs were synthesized via constant pH precipitation, decreasing pH precipitation, and urea homogeneous precipitation. The synthesized samples were characterized by using N-2 physical adsorption, ICP, XRD, TG-DTA, SEM, and H-2-TPR. The characterization results showed that calcination of Co-Al LDHs gave rise to Co-Al mixed oxides consisting of Co(Co, Al)(2)O-4 spinel as the main phase, which showed relatively small crystallite size and high specific surface area, i.e., similar to 12 nm, 90-100 m(2) g (cat) (-1) . The highest catalytic activity was obtained on the Co-Al mixed oxide prepared by decreasing pH precipitation, followed by that prepared by constant pH precipitation, while the Co-Al mixed oxide prepared by urea homogeneous precipitation was much less active. The activity difference can be related to the different reducibility of Co3+ species in Co(Co, Al)(2)O-4 spinel.
Keyword ：
Catalytic total oxidation Catalytic total oxidation Cobalt-aluminum mixed oxides Cobalt-aluminum mixed oxides Layered double hydroxides Layered double hydroxides Volatile organic compounds Volatile organic compounds
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| GB/T 7714 | Ding, Yuanyuan , Fan, Yanyu , Wei, Xiaofeng et al. Total oxidation of benzene over cobalt-aluminum mixed oxides prepared from layered double hydroxides: influence of preparation methods [J]. | REACTION KINETICS MECHANISMS AND CATALYSIS , 2016 , 118 (2) : 593-604 . |
| MLA | Ding, Yuanyuan et al. "Total oxidation of benzene over cobalt-aluminum mixed oxides prepared from layered double hydroxides: influence of preparation methods" . | REACTION KINETICS MECHANISMS AND CATALYSIS 118 . 2 (2016) : 593-604 . |
| APA | Ding, Yuanyuan , Fan, Yanyu , Wei, Xiaofeng , Li, Dalin , Xiao, Yihong , Jiang, Lilong . Total oxidation of benzene over cobalt-aluminum mixed oxides prepared from layered double hydroxides: influence of preparation methods . | REACTION KINETICS MECHANISMS AND CATALYSIS , 2016 , 118 (2) , 593-604 . |
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