This paper presents the restraining moments of outriggers acting on the core wall and the equation of the horizontal top deflection based on a simplified outrigger model. The deformation compatibility conditions betwe...This paper presents the restraining moments of outriggers acting on the core wall and the equation of the horizontal top deflection based on a simplified outrigger model. The deformation compatibility conditions between outriggers and core wall as well as the finite rigidities of outriggers are also considered. One case study was carried out to analyze the horizontal top deflection and the mutation of the restraining moments caused by the variation of outrigger location. The results showed that the method adopted in the paper is simple and reasonable. Some conclusions are valuable to the safety design of high-rise building structures.展开更多
Electrochemical fixation of nitrogen to ammonia with highly active,highly selective and low cost electrocatalysts is a sustainable alternative to the extremely energy-and capital-intensive Haber-Bosch process.Herein,w...Electrochemical fixation of nitrogen to ammonia with highly active,highly selective and low cost electrocatalysts is a sustainable alternative to the extremely energy-and capital-intensive Haber-Bosch process.Herein,we demonstrate a near electroneutral WO3 nanobelt catalyst to be a promising electrocatalyst for selective and efficient nitrogen reduction.The concept of near electroneutral interface is demonstrated by fabricating WO3 nanobelts with small zeta potential value on carbon fiber paper,which ensures a loose double layer structure of the electrode/electrolyte interface and allows nitrogen molecules access the active sites more easily and regulates proton transfer to increase the catalytic selectivity.The WO3/CFP electrode with optimal surface charge achieves a NH3 yield rate of 4.3μg·h-1·mg-1 and a faradaic efficiency of 37.3%at-0.3 V vs.RHE,rivalling the performance of the state-of-the-art nitrogen reduction reaction electrocatalysts.The result reveals that an unobstructed gas-diffusion pathway for continually supplying enough nitrogen to the active catalytic sites is of great importance to the overall catalytic performance.展开更多
Poor cycling stability,as a long-standing issue,has greatly hindered the commercial application of Li-rich layered oxide cathodes in high-energy-density Li-ion batteries.NiO-type rock-salt phase is commonly considered...Poor cycling stability,as a long-standing issue,has greatly hindered the commercial application of Li-rich layered oxide cathodes in high-energy-density Li-ion batteries.NiO-type rock-salt phase is commonly considered electrochemically inert but stable.Herein,an ultrathin(LixTM1-x)O rock-salt shell was in situ constructed at the particle surface during the synthesis of Li-rich layered oxide cathodes through a unique soft chemical quenching method.Comprehensive structural/chemical analysis reveals that,it not only inherits the chemical stability of traditional NiO-type rock-salt phase,but also facilitates Li^+diffusion due to the co-occupancy of Li^+and TM cations.Such a bifunctional shell could efficiently prevent TM dissolution and oxygen evolution during the long-term cycling,eventually leading to the enhanced cycling stability for Li-rich layered oxides(92.7%of capacity retention after 200 cycles at 0.5 C).It provides new guidance to design and synthesize new Li-rich layered oxides with the excellent cycling stability through utilizing some electrochemically-inert phases.展开更多
基金Project supported by the National Natural Science Foundation of China (No. 50378041) and the Specialized Research Fund for theDoctoral Program of Higher Education (No. 20030487016), China
文摘This paper presents the restraining moments of outriggers acting on the core wall and the equation of the horizontal top deflection based on a simplified outrigger model. The deformation compatibility conditions between outriggers and core wall as well as the finite rigidities of outriggers are also considered. One case study was carried out to analyze the horizontal top deflection and the mutation of the restraining moments caused by the variation of outrigger location. The results showed that the method adopted in the paper is simple and reasonable. Some conclusions are valuable to the safety design of high-rise building structures.
基金supported by Shenzhen Science and Technology Research Grant(ZDSYS201707281026184)Natural Science Foundation of Shenzhen(JCYJ20190813110605381)。
文摘Electrochemical fixation of nitrogen to ammonia with highly active,highly selective and low cost electrocatalysts is a sustainable alternative to the extremely energy-and capital-intensive Haber-Bosch process.Herein,we demonstrate a near electroneutral WO3 nanobelt catalyst to be a promising electrocatalyst for selective and efficient nitrogen reduction.The concept of near electroneutral interface is demonstrated by fabricating WO3 nanobelts with small zeta potential value on carbon fiber paper,which ensures a loose double layer structure of the electrode/electrolyte interface and allows nitrogen molecules access the active sites more easily and regulates proton transfer to increase the catalytic selectivity.The WO3/CFP electrode with optimal surface charge achieves a NH3 yield rate of 4.3μg·h-1·mg-1 and a faradaic efficiency of 37.3%at-0.3 V vs.RHE,rivalling the performance of the state-of-the-art nitrogen reduction reaction electrocatalysts.The result reveals that an unobstructed gas-diffusion pathway for continually supplying enough nitrogen to the active catalytic sites is of great importance to the overall catalytic performance.
基金Supported by National Key R&D Program of China(2016YFB0700600)Soft Science Research Project of Guangdong Province(No.2017B030301013)Shenzhen Science and Technology Research Grant(ZDSYS201707281026184)。
文摘Poor cycling stability,as a long-standing issue,has greatly hindered the commercial application of Li-rich layered oxide cathodes in high-energy-density Li-ion batteries.NiO-type rock-salt phase is commonly considered electrochemically inert but stable.Herein,an ultrathin(LixTM1-x)O rock-salt shell was in situ constructed at the particle surface during the synthesis of Li-rich layered oxide cathodes through a unique soft chemical quenching method.Comprehensive structural/chemical analysis reveals that,it not only inherits the chemical stability of traditional NiO-type rock-salt phase,but also facilitates Li^+diffusion due to the co-occupancy of Li^+and TM cations.Such a bifunctional shell could efficiently prevent TM dissolution and oxygen evolution during the long-term cycling,eventually leading to the enhanced cycling stability for Li-rich layered oxides(92.7%of capacity retention after 200 cycles at 0.5 C).It provides new guidance to design and synthesize new Li-rich layered oxides with the excellent cycling stability through utilizing some electrochemically-inert phases.
