The effects of interfacial modifier on the mechanical properties of kaolin-filled polyamide 6 (PA6) have been studied. The interracial interaction between polyamide 6 and kaolin has been character ized by means of inf...The effects of interfacial modifier on the mechanical properties of kaolin-filled polyamide 6 (PA6) have been studied. The interracial interaction between polyamide 6 and kaolin has been character ized by means of infrared spectroscopy (IR) and scanning electron microscopy (SEM). The results show that the role of the interracial modifier lies in forming an elastic interlayer with good adhesion between kaolin and PA 6. A composite with high impact strength, high tensile strength and high elastic modulus can be obtained by inserting the elastic interfacial modifier into the rigid-particle-filled polymer system.展开更多
The polysulfide shuttle effect critically hinders lithium-sulfur(Li-S)battery development,therefore,the design of heterogeneous interface engineering with“adsorption-catalysis”functions for polysulfide conversion ha...The polysulfide shuttle effect critically hinders lithium-sulfur(Li-S)battery development,therefore,the design of heterogeneous interface engineering with“adsorption-catalysis”functions for polysulfide conversion has garnered considerable attention.However,the exploration of the intricate relationship between key electronic properties and catalytic activity at such interfaces remains a challenge.Additionally,a comprehensive understanding of the thermodynamic growth mechanisms for heterostructure materials is lacking.Herein,a Ni-based homologous structure was precisely constructed via thermodynamic control,with a specific focus on optimizing the interface design.The theoretical results show that the heterostructures with adjustable composition realize the appropriate upward shift to the D-band,improving the affinity towards polysulfide,and further reducing the reaction energy barrier.On this basis,the relationship between interface design and the D-band center,as well as catalytic performance,was established.Specifically,M-Ni_(3)Fe/Ni_(3)ZnC_(0.7)accomplishes the electron enrichment at the interface,supporting the further diffusion of polysulfides,and lowering the Li-S bond energy,performing the bidirectional catalytic transformation of polysulfides.As a result,the Li-S batteries with the cathode of M-Ni_(3)Fe/Ni_(3)ZnC_(0.7)/S deliver rate performances of discharge capacity of 514 mA h g^(−1)at 5.0 C.This understanding of the D-band and interfacial design provides a framework for Li-S catalyst optimization.展开更多
CO_(2)capture and conversion has been prospected as an auspicious technology to simultaneously tackle the rise in global CO_(2)emission and produce valueadded fuels with the goal of accomplishing carbon neutrality.A s...CO_(2)capture and conversion has been prospected as an auspicious technology to simultaneously tackle the rise in global CO_(2)emission and produce valueadded fuels with the goal of accomplishing carbon neutrality.A sustainable route to achieve this is via the utilization of solar energy,thereby harnessing the abundant and nonexhaustive resource to shift our reliance away from rapidly depleting fossil fuels.Graphitic carbon nitride(g-C_(3)N_(4))and its allotrope have earned its rank as a fascinating metal-free photocatalyst due to its superior stability,high surface-area-to-volume ratio,and tunable surface engineering.By leveraging these properties,robust carbon nitride-based nanostructures are engineered for photocatalytic CO_(2)conversion to energy-rich C_(1)-C_(2) product,which is indispensable in the chemical industry.Thus,this review presents the latest panorama of experimental and computational research on tuning the local electronic,surface chemical coordination environment,charge dynamics and optical properties of low-dimensional carbon nitride and its allotropes toward highly selective and efficient CO_(2)photoconversion.To name a few,structural engineering,point-defect engineering,heterojunction construction,and cocatalyst loading.To advance this frontier,critical insights are elucidated to establish the structure-performance relationship and unravel primary factors dictating the selectivity of C_(1)-C_(2) molecules from CO_(2)reduction.External-field assisted photocatalysis such as with electric(photoelectro-)and heat(photothermal)is discussed to uncover the synergistic contributions that drive the development in photochemistry.Last,future challenges and prospects are outlined for the potential application of solar-driven CO_(2)conversion,along with the scale-up strategy from the economic viewpoint toward the rational development of high-efficiency carbon nitride catalysts.展开更多
基金The project was supported by National Natural Science Foundation of China
文摘The effects of interfacial modifier on the mechanical properties of kaolin-filled polyamide 6 (PA6) have been studied. The interracial interaction between polyamide 6 and kaolin has been character ized by means of infrared spectroscopy (IR) and scanning electron microscopy (SEM). The results show that the role of the interracial modifier lies in forming an elastic interlayer with good adhesion between kaolin and PA 6. A composite with high impact strength, high tensile strength and high elastic modulus can be obtained by inserting the elastic interfacial modifier into the rigid-particle-filled polymer system.
基金supported financially by the National Natural Science Foundation of China(52172242,22109135,52371237)the Science&Technology Talents Lifting Project of Hunan Province(2023TJ-Z32)+2 种基金the Hunan Provincial Education Office Foundation of China(20B570,23B0126)the Natural Science Foundation of Hunan Province(2021JJ30659,2022JJ40423)the Postgraduate Scientific Research Innovation Project of Hunan Province(QL20230146).
文摘The polysulfide shuttle effect critically hinders lithium-sulfur(Li-S)battery development,therefore,the design of heterogeneous interface engineering with“adsorption-catalysis”functions for polysulfide conversion has garnered considerable attention.However,the exploration of the intricate relationship between key electronic properties and catalytic activity at such interfaces remains a challenge.Additionally,a comprehensive understanding of the thermodynamic growth mechanisms for heterostructure materials is lacking.Herein,a Ni-based homologous structure was precisely constructed via thermodynamic control,with a specific focus on optimizing the interface design.The theoretical results show that the heterostructures with adjustable composition realize the appropriate upward shift to the D-band,improving the affinity towards polysulfide,and further reducing the reaction energy barrier.On this basis,the relationship between interface design and the D-band center,as well as catalytic performance,was established.Specifically,M-Ni_(3)Fe/Ni_(3)ZnC_(0.7)accomplishes the electron enrichment at the interface,supporting the further diffusion of polysulfides,and lowering the Li-S bond energy,performing the bidirectional catalytic transformation of polysulfides.As a result,the Li-S batteries with the cathode of M-Ni_(3)Fe/Ni_(3)ZnC_(0.7)/S deliver rate performances of discharge capacity of 514 mA h g^(−1)at 5.0 C.This understanding of the D-band and interfacial design provides a framework for Li-S catalyst optimization.
基金support provided by the Ministry of Higher Education(MOHE)Malaysia under the Fundamental Research Grant Scheme(FRGS)(Ref no:FRGS/1/2020/TK0/XMU/02/1)This work is also funded by Xiamen University Malaysia Investigatorship Grant(Grant no:IENG/0038)+1 种基金Xiamen University Malaysia Research Fund(XMUMRF/2021-C8/IENG/0041 and XMUMRF/2019-C3/IENG/0013)Hengyuan International Sdn.Bhd.(Grant no:EENG/0003).
文摘CO_(2)capture and conversion has been prospected as an auspicious technology to simultaneously tackle the rise in global CO_(2)emission and produce valueadded fuels with the goal of accomplishing carbon neutrality.A sustainable route to achieve this is via the utilization of solar energy,thereby harnessing the abundant and nonexhaustive resource to shift our reliance away from rapidly depleting fossil fuels.Graphitic carbon nitride(g-C_(3)N_(4))and its allotrope have earned its rank as a fascinating metal-free photocatalyst due to its superior stability,high surface-area-to-volume ratio,and tunable surface engineering.By leveraging these properties,robust carbon nitride-based nanostructures are engineered for photocatalytic CO_(2)conversion to energy-rich C_(1)-C_(2) product,which is indispensable in the chemical industry.Thus,this review presents the latest panorama of experimental and computational research on tuning the local electronic,surface chemical coordination environment,charge dynamics and optical properties of low-dimensional carbon nitride and its allotropes toward highly selective and efficient CO_(2)photoconversion.To name a few,structural engineering,point-defect engineering,heterojunction construction,and cocatalyst loading.To advance this frontier,critical insights are elucidated to establish the structure-performance relationship and unravel primary factors dictating the selectivity of C_(1)-C_(2) molecules from CO_(2)reduction.External-field assisted photocatalysis such as with electric(photoelectro-)and heat(photothermal)is discussed to uncover the synergistic contributions that drive the development in photochemistry.Last,future challenges and prospects are outlined for the potential application of solar-driven CO_(2)conversion,along with the scale-up strategy from the economic viewpoint toward the rational development of high-efficiency carbon nitride catalysts.
