Lithium metal batteries are emerging as a strong candidate in the future energy storage market due to its extremely high energy density.However,the uncontrollable lithium dendrites and volume change of lithium metal a...Lithium metal batteries are emerging as a strong candidate in the future energy storage market due to its extremely high energy density.However,the uncontrollable lithium dendrites and volume change of lithium metal anodes severely hinder its application.In this work,the porous Cu skeleton modified with Cu_(6)Sn_(5)layer is prepared via dealloying brass foil following a facile electroless process.The porous Cu skeleton with large specific surface area and high electronic conductivity effectively reduces the local current density.The Cu_(6)Sn_(5)can react with lithium during the discharge process to form lithiophilic Li_(7)Sn_(2)in situ to promote Li-ions transport and reduce the nucleation energy barrier of lithium to guide the uniform lithium deposition.Therefore,more than 300 cycles at 1 mA cm^(−2)are achieved in the half-cell with an average Coulombic efficiency of 97.5%.The symmetric cell shows a superior cycle life of more than 1000 h at 1 mA cm^(−2)with a small average hysteresis voltage of 16 mV.When coupled with LiFePO_(4)cathode,the full cell also maintains excellent cycling and rate performance.展开更多
Synthetic biphenyl diester, dimethyl 4, 4’-dimethoxy-5, 6, 5′, 6′-bismethylenedioxybi-phenyl-2, 2′-dicarboxylate is a new antihepatitic drug. Pharmacological studies showed that biphenyl diester has relatively str...Synthetic biphenyl diester, dimethyl 4, 4’-dimethoxy-5, 6, 5′, 6′-bismethylenedioxybi-phenyl-2, 2′-dicarboxylate is a new antihepatitic drug. Pharmacological studies showed that biphenyl diester has relatively strong SGPT lowering activity. It has been used clinically for the treatment of chronic hepatitis and lowering the elevated SGPT caused by certain chemicals and medicaments. Owing to the presence of four ortho substituents on the 2, 2′ and 6, 6′position in the biphenyl skeleton, the molecule can exist in two atropisomers.展开更多
In the study of the catalytic active center of nitrogen fixation in nitrogenase, structural models containing MoFe3S3 or MoFe3S4 cubane-like skeleton have been proposed. The syntheses of these model compounds have sin...In the study of the catalytic active center of nitrogen fixation in nitrogenase, structural models containing MoFe3S3 or MoFe3S4 cubane-like skeleton have been proposed. The syntheses of these model compounds have since attracted the attention of many chemists. Up to the present time, however, only Holm’s research group has obtained MoFe3S4 single cubane cluster compounds by multi-step cleavage reaction of Mo—Fe—S展开更多
基金supported by the National Natural Science Foundation of China(52072173)the Jiangsu Province Outstanding Youth Fund(BK20200016)the International Cooperation of Jiangsu Province(SBZ2022000084)
文摘Lithium metal batteries are emerging as a strong candidate in the future energy storage market due to its extremely high energy density.However,the uncontrollable lithium dendrites and volume change of lithium metal anodes severely hinder its application.In this work,the porous Cu skeleton modified with Cu_(6)Sn_(5)layer is prepared via dealloying brass foil following a facile electroless process.The porous Cu skeleton with large specific surface area and high electronic conductivity effectively reduces the local current density.The Cu_(6)Sn_(5)can react with lithium during the discharge process to form lithiophilic Li_(7)Sn_(2)in situ to promote Li-ions transport and reduce the nucleation energy barrier of lithium to guide the uniform lithium deposition.Therefore,more than 300 cycles at 1 mA cm^(−2)are achieved in the half-cell with an average Coulombic efficiency of 97.5%.The symmetric cell shows a superior cycle life of more than 1000 h at 1 mA cm^(−2)with a small average hysteresis voltage of 16 mV.When coupled with LiFePO_(4)cathode,the full cell also maintains excellent cycling and rate performance.
文摘Synthetic biphenyl diester, dimethyl 4, 4’-dimethoxy-5, 6, 5′, 6′-bismethylenedioxybi-phenyl-2, 2′-dicarboxylate is a new antihepatitic drug. Pharmacological studies showed that biphenyl diester has relatively strong SGPT lowering activity. It has been used clinically for the treatment of chronic hepatitis and lowering the elevated SGPT caused by certain chemicals and medicaments. Owing to the presence of four ortho substituents on the 2, 2′ and 6, 6′position in the biphenyl skeleton, the molecule can exist in two atropisomers.
文摘In the study of the catalytic active center of nitrogen fixation in nitrogenase, structural models containing MoFe3S3 or MoFe3S4 cubane-like skeleton have been proposed. The syntheses of these model compounds have since attracted the attention of many chemists. Up to the present time, however, only Holm’s research group has obtained MoFe3S4 single cubane cluster compounds by multi-step cleavage reaction of Mo—Fe—S
