Glasses based on ZnO-Bi_2O_3-B_2O_3 system are expected to be a new kind of sealing glasses because of their low melting temperature and other properties.In order to reveal the effect of B_2O_3 on the rheological beha...Glasses based on ZnO-Bi_2O_3-B_2O_3 system are expected to be a new kind of sealing glasses because of their low melting temperature and other properties.In order to reveal the effect of B_2O_3 on the rheological behavior of ZnO-Bi_2O_3-B_2O_3 system glass melt,the properties of viscosity,thermal expansion,fluxion property and wetting process between cylinder samples and stainless steel were investigated with the rotating crucible viscometer,dilato meter and high-temperature microscope.The structure of sintered glass samples was investigated with scanning electron microscope.The results show that the B_2O_3 content increasing in B_1-B_3 at the given temperature between 400 ℃ and 500 ℃ leads to the increasing of the sample viscosity.When the amount of B_2O_3 increases from 5.24%to 9.24%(mass fraction),the coefficients of thermal expansion of glass samples decrease smoothly from 10.94×10^(-6) to10.71×10^(-6) and 10.38×10^(-6) ℃^(-1) respectively.In the case of sealing temperature,its value increases from 453 ℃ to 494 ℃.ZnO-Bi_2O_3-B_2O_3 system low-melting glass powder sintering was with viscous liquid to participate,which could make the densification of glass sample more effective and more efficient.With the content of B_2O_3 increasing,the wetting angle between the glasses samples and stainless steel could also increase,and the resulting appropriate sealing temperature range is 460-490 ℃.展开更多
The metal-air batteries with the largest theoretical energy densities have been paid much more attention.However,metal-air batteries including Li-air/O_(2),Li-CO_(2),Na-air/O_(2).and Zn-air/O_(2) batteries,are complex...The metal-air batteries with the largest theoretical energy densities have been paid much more attention.However,metal-air batteries including Li-air/O_(2),Li-CO_(2),Na-air/O_(2).and Zn-air/O_(2) batteries,are complex systems that have their respective scientific problems,such as metal dendrite forming/deforming,the kinetics of redox mediators for oxygen reduction/evolution reactions,high overpotentials,desolution of CO_(2),H_(2)O,etc.from the air and related side reactions on both anode and cathode.It should be the main direction to address these shortages to improve performance.Here,we summarized recently research progress in these metal-air/O_(2) batteries.Some perspectives are also provided for these research fields.展开更多
基金Project(2012BAA08B04)supported by the National“Twelfth Five-Year”Plan for Science&Technology Support of China
文摘Glasses based on ZnO-Bi_2O_3-B_2O_3 system are expected to be a new kind of sealing glasses because of their low melting temperature and other properties.In order to reveal the effect of B_2O_3 on the rheological behavior of ZnO-Bi_2O_3-B_2O_3 system glass melt,the properties of viscosity,thermal expansion,fluxion property and wetting process between cylinder samples and stainless steel were investigated with the rotating crucible viscometer,dilato meter and high-temperature microscope.The structure of sintered glass samples was investigated with scanning electron microscope.The results show that the B_2O_3 content increasing in B_1-B_3 at the given temperature between 400 ℃ and 500 ℃ leads to the increasing of the sample viscosity.When the amount of B_2O_3 increases from 5.24%to 9.24%(mass fraction),the coefficients of thermal expansion of glass samples decrease smoothly from 10.94×10^(-6) to10.71×10^(-6) and 10.38×10^(-6) ℃^(-1) respectively.In the case of sealing temperature,its value increases from 453 ℃ to 494 ℃.ZnO-Bi_2O_3-B_2O_3 system low-melting glass powder sintering was with viscous liquid to participate,which could make the densification of glass sample more effective and more efficient.With the content of B_2O_3 increasing,the wetting angle between the glasses samples and stainless steel could also increase,and the resulting appropriate sealing temperature range is 460-490 ℃.
基金supported by the National Basic Research Programme of China (2021YFB3800301)the National Natural Science Foundation of China (21633003 and U1801251)Science,and Technology Innovation Fund for Emission Peak and Carbon Neutrality of Jiangsu Province (BK20220034)。
文摘The metal-air batteries with the largest theoretical energy densities have been paid much more attention.However,metal-air batteries including Li-air/O_(2),Li-CO_(2),Na-air/O_(2).and Zn-air/O_(2) batteries,are complex systems that have their respective scientific problems,such as metal dendrite forming/deforming,the kinetics of redox mediators for oxygen reduction/evolution reactions,high overpotentials,desolution of CO_(2),H_(2)O,etc.from the air and related side reactions on both anode and cathode.It should be the main direction to address these shortages to improve performance.Here,we summarized recently research progress in these metal-air/O_(2) batteries.Some perspectives are also provided for these research fields.
