Lithium-sulfur batteries(LSBs)can work at high temperatures,but they suffer from poor cycle life stability due to the“shuttle effect”of polysulfides.In this study,pollen-derived porous carbon/cuprous phosphide(PC/Cu...Lithium-sulfur batteries(LSBs)can work at high temperatures,but they suffer from poor cycle life stability due to the“shuttle effect”of polysulfides.In this study,pollen-derived porous carbon/cuprous phosphide(PC/Cu_(3)P)hybrids were rationally synthesized using a one-step carbonization method using pollen as the source material,acting as the sulfur host for LSBs.In the hybrid,polar Cu_(3)P can markedly inhibit the“shuttle effect”by regulating the adsorption ability toward polysulfides,as confirmed by theoretical calculations and experimental tests.As an example,the camellia pollen porous carbon(CPC)/Cu_(3)P/S electrode shows a high capacity of 1205.6 mAh g^(−1) at 0.1 C,an ultralow capacity decay rate of 0.038%per cycle after 1000 cycles at 1 C,and a rather high initial Coulombic efficiency of 98.5%.The CPC/Cu_(3)P LSBs can work well at high temperatures,having a high capacity of 545.9 mAh g^(−1) at 1 C even at 150℃.The strategy of the PC/Cu_(3)P hybrid proposed in this study is expected to be an ideal cathode for ultrastable high-temperature LSBs.We believe that this strategy is universal and worthy of in-depth development for the next generation energy storage devices.展开更多
Infections caused by viruses are one of the foremost causes of morbidity and mortality in the world.Although a number of antiviral drugs are currently used for treatment of various kinds of viral infection diseases,th...Infections caused by viruses are one of the foremost causes of morbidity and mortality in the world.Although a number of antiviral drugs are currently used for treatment of various kinds of viral infection diseases,there is still no available therapeutic agent for most of the viruses in clinical practice.Coumarin is a chemical compound which is found naturally in a variety of plants,it can also be synthetically produced possessing diverse biological effects.More recently,reports have highlighted the potential role of coumarin derivatives as antiviral agents.This review outlines the advances in coumarin-based compounds against various viruses including human immunodeficiency virus,hepatitis virus,herpes simplex virus,Chikungunya virus and Enterovirus 71,as well as the structure activity relationship and the possible mechanism of action of the most potent coumarin derivatives.展开更多
基金supported by the Innovation Platform of Energy Storage Engineering and New Material in Zhejiang University(No.K19-534202-002)the National Natural Science Foundation of China(No.21978261)the Zhejiang Provincial Key Research and Development Program of China(No.2021C01030).
文摘Lithium-sulfur batteries(LSBs)can work at high temperatures,but they suffer from poor cycle life stability due to the“shuttle effect”of polysulfides.In this study,pollen-derived porous carbon/cuprous phosphide(PC/Cu_(3)P)hybrids were rationally synthesized using a one-step carbonization method using pollen as the source material,acting as the sulfur host for LSBs.In the hybrid,polar Cu_(3)P can markedly inhibit the“shuttle effect”by regulating the adsorption ability toward polysulfides,as confirmed by theoretical calculations and experimental tests.As an example,the camellia pollen porous carbon(CPC)/Cu_(3)P/S electrode shows a high capacity of 1205.6 mAh g^(−1) at 0.1 C,an ultralow capacity decay rate of 0.038%per cycle after 1000 cycles at 1 C,and a rather high initial Coulombic efficiency of 98.5%.The CPC/Cu_(3)P LSBs can work well at high temperatures,having a high capacity of 545.9 mAh g^(−1) at 1 C even at 150℃.The strategy of the PC/Cu_(3)P hybrid proposed in this study is expected to be an ideal cathode for ultrastable high-temperature LSBs.We believe that this strategy is universal and worthy of in-depth development for the next generation energy storage devices.
文摘Infections caused by viruses are one of the foremost causes of morbidity and mortality in the world.Although a number of antiviral drugs are currently used for treatment of various kinds of viral infection diseases,there is still no available therapeutic agent for most of the viruses in clinical practice.Coumarin is a chemical compound which is found naturally in a variety of plants,it can also be synthetically produced possessing diverse biological effects.More recently,reports have highlighted the potential role of coumarin derivatives as antiviral agents.This review outlines the advances in coumarin-based compounds against various viruses including human immunodeficiency virus,hepatitis virus,herpes simplex virus,Chikungunya virus and Enterovirus 71,as well as the structure activity relationship and the possible mechanism of action of the most potent coumarin derivatives.
