A copper-TiO2 based catalyst（Cu-OH-Cl-TiO2） was prepared through a slurry impregnation approach and the catalyst was found to be active and selective for the epoxidation of propylene by dioxygen. With a feed gas of ...A copper-TiO2 based catalyst（Cu-OH-Cl-TiO2） was prepared through a slurry impregnation approach and the catalyst was found to be active and selective for the epoxidation of propylene by dioxygen. With a feed gas of 10% C3H6, 10% O2 and 80% N2 at a gas hourly space velocity（GHSV） of 4000 h-1, a propylene conversion of 4.8% and a propylene oxide（PO） selectivity of 38.9% were achieved over the obtained Cu-OH-Cl-TiO2 catalyst at a reaction temperature of 500 K. It revealed that Cu2＋ provided by crystalline Cu2（OH）3Cl plays a key role in catalytic conversion of propylene to PO.展开更多
A new layered zincophosphate was synthesized under solvothermal conditions by employing racemic 1,2-diaminopropane as the structure-directing agent. The structure of the compound was solved by means of single-crystal ...A new layered zincophosphate was synthesized under solvothermal conditions by employing racemic 1,2-diaminopropane as the structure-directing agent. The structure of the compound was solved by means of single-crystal X-ray diffraction analysis. It crystallized in the monoclinic space group P2_1/c (No. 14) with a= 1.047 0(3) nm, b=0.787 31(18) nm, c=0.662 68(16) nm, β=103.120(5)°, V=0.532 0(2) nm 3 and Z=4. The structure is made up of anionic zincophosphate sheets stacked in an AAAA sequence. The individual sheet contains three- and four-membered rings and the infinite Zn-O-Zn chains can also be envisaged in the sheet. The charge-balancing diprotonated racemic 1,2-diaminopropane cations are sandwiched between the layers, whereas the inorganic layers are stabilized by strong H-bonds formed between the N atoms of the amine and the O atoms in the inorganic sheets.展开更多
Solid oxide electrolysis cells(SOECs)provide a promising way for converting renewable energy into chemical fuels.Traditionally,NiO/CGO(nickel-gadolinium doped ceria)cermet has shown its excellent properties in ionic a...Solid oxide electrolysis cells(SOECs)provide a promising way for converting renewable energy into chemical fuels.Traditionally,NiO/CGO(nickel-gadolinium doped ceria)cermet has shown its excellent properties in ionic and electronic conductivity under reducing conditions.Herein,we developed a novel 1D NiO/CGO cathode through a cerium metal-organic framework(MOF)derived process.The cathode’s 1D nanostructure integrated with a microchannel scaffold facilitates enhanced mass transport,providing vertically aligned pathways for CO_(2)and H_(2)O diffusion.Additionally,the 1D framework increases the number of interfacial sites and reduces ion diffusion distances,thereby simplifying electron/ion transport.Consequently,this advanced cathode achieved a significant breakthrough in SOEC performance,maintaining efficient CO_(2)and H_(2)O electrolysis at an extraordinary current density of 1.41 A/cm^(2)at 1.5 V and excellent stability over 24 h at 850℃.The enhanced performance of this newly developed cathode not only achieves a remarkable 100%improvement compared to those of NiO/CGO cathodes with varying geometrical configurations but also surpasses those of commercial NiO/CGO catalysts by an outstanding 40%when tested under identical conditions.The development of the 1D NiO/CGO enhances the efficiency and durability of ceramic cathodes for CO_(2)and H_(2)O co-electrolysis in SOECs and improves the scalability and effectiveness of SOECs in renewable energy applications.展开更多
In the past two decades, photoluminescent semiconductor quantum dots（QDs） have received intensive attention for a variety of promising properties and applications, especially for their potential application in cellu...In the past two decades, photoluminescent semiconductor quantum dots（QDs） have received intensive attention for a variety of promising properties and applications, especially for their potential application in cellular imagingE. QDs with high quantum yield have been prepared based on cad mium（zinc） selenide（sulfide） and related coreshell compo sites. However, the release of Cd2＋, S2 and Se2 ions in evitably causes serious health and environmental concerns. Therefore, many efforts have been devoted to developing be nign alternatives with enhanced photoluminescence, such as silicon nanoparticles and nanowires. Carbonbased nanomaterials, including carbon nano tubes（CNTs） and carbogenic nanoparticles（CNPs）, represent an exciting new type of alternative to the aforementioned QDs with high quantum yield. CNPs are superior to QDs in chemi cally inertness, biocompatibility and photostability. After the report on the photoluminescence of carbon dots prepared by laser ablation with graphite as carbon sourcetill, several strate gies have been developed for the preparation of luminescent CNPs. For instance, luminescent CNPs were prepared by Liu et al.021 with candle soot via oxidative acid treatment, and the resulting CNPs with different emission colors were isolated by means of electrophoretic separation. Hu et al. employed an improved onestep approach for the synthesis of luminescent CNPs by laser irradiating a suspension of carbon materials in organic solvents of diamineterminated oligomeric poly（ethylene glycol）（PEG1500N）. More recently, luminescent carbogenic dots have been obtained by Peng and Travas via surface passivation of carbogenic dots in an aqueous solution with carbohydrates as the starting materials. Carbogenic nano particlesloaded magnesiumaluminophosphate solid phosphors.展开更多
基金Supported by the National Basic Research Program of China(No.2007CB613303)the National Natural Science Foundation of China(No.20731003)
文摘A copper-TiO2 based catalyst（Cu-OH-Cl-TiO2） was prepared through a slurry impregnation approach and the catalyst was found to be active and selective for the epoxidation of propylene by dioxygen. With a feed gas of 10% C3H6, 10% O2 and 80% N2 at a gas hourly space velocity（GHSV） of 4000 h-1, a propylene conversion of 4.8% and a propylene oxide（PO） selectivity of 38.9% were achieved over the obtained Cu-OH-Cl-TiO2 catalyst at a reaction temperature of 500 K. It revealed that Cu2＋ provided by crystalline Cu2（OH）3Cl plays a key role in catalytic conversion of propylene to PO.
基金Supported by the National Natural Science Foundation of China( No.2 993 10 10 )
文摘A new layered zincophosphate was synthesized under solvothermal conditions by employing racemic 1,2-diaminopropane as the structure-directing agent. The structure of the compound was solved by means of single-crystal X-ray diffraction analysis. It crystallized in the monoclinic space group P2_1/c (No. 14) with a= 1.047 0(3) nm, b=0.787 31(18) nm, c=0.662 68(16) nm, β=103.120(5)°, V=0.532 0(2) nm 3 and Z=4. The structure is made up of anionic zincophosphate sheets stacked in an AAAA sequence. The individual sheet contains three- and four-membered rings and the infinite Zn-O-Zn chains can also be envisaged in the sheet. The charge-balancing diprotonated racemic 1,2-diaminopropane cations are sandwiched between the layers, whereas the inorganic layers are stabilized by strong H-bonds formed between the N atoms of the amine and the O atoms in the inorganic sheets.
基金supported by the National Natural Science Foundation of China(Nos.22275121,21931005,22105122,52272265)the National Key R&D Program of China(No.2023YFA1506300)+1 种基金the Shanghai Municipal Science and Technology Major Project of China,the Open Foundation Commission of Shaoxing Research Institute of Renewable Energy and Molecular Engineering,China(No.JDSX2022038)the Project of Jiangxi Academy of Sciences,China(No.2023YSTZX01).
文摘Solid oxide electrolysis cells(SOECs)provide a promising way for converting renewable energy into chemical fuels.Traditionally,NiO/CGO(nickel-gadolinium doped ceria)cermet has shown its excellent properties in ionic and electronic conductivity under reducing conditions.Herein,we developed a novel 1D NiO/CGO cathode through a cerium metal-organic framework(MOF)derived process.The cathode’s 1D nanostructure integrated with a microchannel scaffold facilitates enhanced mass transport,providing vertically aligned pathways for CO_(2)and H_(2)O diffusion.Additionally,the 1D framework increases the number of interfacial sites and reduces ion diffusion distances,thereby simplifying electron/ion transport.Consequently,this advanced cathode achieved a significant breakthrough in SOEC performance,maintaining efficient CO_(2)and H_(2)O electrolysis at an extraordinary current density of 1.41 A/cm^(2)at 1.5 V and excellent stability over 24 h at 850℃.The enhanced performance of this newly developed cathode not only achieves a remarkable 100%improvement compared to those of NiO/CGO cathodes with varying geometrical configurations but also surpasses those of commercial NiO/CGO catalysts by an outstanding 40%when tested under identical conditions.The development of the 1D NiO/CGO enhances the efficiency and durability of ceramic cathodes for CO_(2)and H_(2)O co-electrolysis in SOECs and improves the scalability and effectiveness of SOECs in renewable energy applications.
基金Supported by the National Natural Science Foundation of China（Nos.21071060, 20731003） and the National Basic Research Program of China（No.2007CB613303）.
文摘In the past two decades, photoluminescent semiconductor quantum dots（QDs） have received intensive attention for a variety of promising properties and applications, especially for their potential application in cellular imagingE. QDs with high quantum yield have been prepared based on cad mium（zinc） selenide（sulfide） and related coreshell compo sites. However, the release of Cd2＋, S2 and Se2 ions in evitably causes serious health and environmental concerns. Therefore, many efforts have been devoted to developing be nign alternatives with enhanced photoluminescence, such as silicon nanoparticles and nanowires. Carbonbased nanomaterials, including carbon nano tubes（CNTs） and carbogenic nanoparticles（CNPs）, represent an exciting new type of alternative to the aforementioned QDs with high quantum yield. CNPs are superior to QDs in chemi cally inertness, biocompatibility and photostability. After the report on the photoluminescence of carbon dots prepared by laser ablation with graphite as carbon sourcetill, several strate gies have been developed for the preparation of luminescent CNPs. For instance, luminescent CNPs were prepared by Liu et al.021 with candle soot via oxidative acid treatment, and the resulting CNPs with different emission colors were isolated by means of electrophoretic separation. Hu et al. employed an improved onestep approach for the synthesis of luminescent CNPs by laser irradiating a suspension of carbon materials in organic solvents of diamineterminated oligomeric poly（ethylene glycol）（PEG1500N）. More recently, luminescent carbogenic dots have been obtained by Peng and Travas via surface passivation of carbogenic dots in an aqueous solution with carbohydrates as the starting materials. Carbogenic nano particlesloaded magnesiumaluminophosphate solid phosphors.
