Aqueous zinc ion batteries are regarded as one of the most promising candidates for large-scale energy stor-age due to their high safety,cost-effectiveness,and environ-mental friendliness.However,uncontrolled zinc den...Aqueous zinc ion batteries are regarded as one of the most promising candidates for large-scale energy stor-age due to their high safety,cost-effectiveness,and environ-mental friendliness.However,uncontrolled zinc dendrite growth and side reactions of the zinc anode decrease the sta-bility of Zn batteries.We report the synthesis of an air-oxid-ized carbon nanotube(O-CNT)film by chemical vapor de-position followed by heat treatment in air which is used as a protective layer on the Zn foil to suppress zinc dendrite growth.The increase in the hydrophilicity of the O-CNT film caused by air oxidation facilitates zinc deposition between the film and the anode instead of deposition on the film surface.The porous structure of the O-CNT film homogenizes the Zn^(2+)ion flux and the electric field on the surface of the Zn foil,leading to the uniform deposition of Zn.As a result,a O-CNT@Zn symmetric cell has a much better cycling stability with a life of more than 3000 h at 1 mA cm^(−2) with a capacity of 1 mAh cm^(−2),and values of more than 2000 h and 1 mAh cm^(−2) at 5 mA cm^(−2).In addition,a O-CNT@Zn||Mn^(2+)inserted hydrated vanadium pentoxide(MnVOH)full cell has a better rate per-formance than a Zn||MnVOH cell,achieving a high discharge capacity of 194 mAh g^(−1) at a high current density of 8 A g^(−1).In a long-term cycling test,the O-CNT@Zn||MnVOH full cell has a capacity retention of 58.8%after 2000 cycles at a current density of 5 A·g^(−1).展开更多
FQ171.68 2004064444 室温Si玻璃直接键合技术研究=Research on siliconglass direct bonding at room temperature[刊,中]/黄腾超(浙江大学现代光学与仪器国家重点实验室.浙江,杭州(310027)),沈亦兵…∥光电子·激光.—2004,15(5)....FQ171.68 2004064444 室温Si玻璃直接键合技术研究=Research on siliconglass direct bonding at room temperature[刊,中]/黄腾超(浙江大学现代光学与仪器国家重点实验室.浙江,杭州(310027)),沈亦兵…∥光电子·激光.—2004,15(5).—512-515 将表面亲水性处理过的玻璃和Si片在室温、大气的环境下干涉,进行温度为150℃以下、时间为20～200h的预键合。预键合后,Si和玻璃基片表面能有显著的提高,水分子和Sj表面Si—OH原子团中的O原子连在一起,OH^-团数量增加了许多,形成较多的H键。预键合的Si-玻璃基片在200℃下退火,消除由Si、玻璃热膨胀系数和热传导系数差异引起的诱导应力。2基片的Si—OH间发生聚合反应,产生水及Si—O键,使得基片键合的表面能得到了更好的提高。测量了室温键合时间对Si-玻璃表面能力的影响以及退火时间对键合强度的影响。展开更多
基金supported by the National Natural Science Foundation of China(22179093 and21905202)。
文摘Aqueous zinc ion batteries are regarded as one of the most promising candidates for large-scale energy stor-age due to their high safety,cost-effectiveness,and environ-mental friendliness.However,uncontrolled zinc dendrite growth and side reactions of the zinc anode decrease the sta-bility of Zn batteries.We report the synthesis of an air-oxid-ized carbon nanotube(O-CNT)film by chemical vapor de-position followed by heat treatment in air which is used as a protective layer on the Zn foil to suppress zinc dendrite growth.The increase in the hydrophilicity of the O-CNT film caused by air oxidation facilitates zinc deposition between the film and the anode instead of deposition on the film surface.The porous structure of the O-CNT film homogenizes the Zn^(2+)ion flux and the electric field on the surface of the Zn foil,leading to the uniform deposition of Zn.As a result,a O-CNT@Zn symmetric cell has a much better cycling stability with a life of more than 3000 h at 1 mA cm^(−2) with a capacity of 1 mAh cm^(−2),and values of more than 2000 h and 1 mAh cm^(−2) at 5 mA cm^(−2).In addition,a O-CNT@Zn||Mn^(2+)inserted hydrated vanadium pentoxide(MnVOH)full cell has a better rate per-formance than a Zn||MnVOH cell,achieving a high discharge capacity of 194 mAh g^(−1) at a high current density of 8 A g^(−1).In a long-term cycling test,the O-CNT@Zn||MnVOH full cell has a capacity retention of 58.8%after 2000 cycles at a current density of 5 A·g^(−1).
文摘FQ171.68 2004064444 室温Si玻璃直接键合技术研究=Research on siliconglass direct bonding at room temperature[刊,中]/黄腾超(浙江大学现代光学与仪器国家重点实验室.浙江,杭州(310027)),沈亦兵…∥光电子·激光.—2004,15(5).—512-515 将表面亲水性处理过的玻璃和Si片在室温、大气的环境下干涉,进行温度为150℃以下、时间为20～200h的预键合。预键合后,Si和玻璃基片表面能有显著的提高,水分子和Sj表面Si—OH原子团中的O原子连在一起,OH^-团数量增加了许多,形成较多的H键。预键合的Si-玻璃基片在200℃下退火,消除由Si、玻璃热膨胀系数和热传导系数差异引起的诱导应力。2基片的Si—OH间发生聚合反应,产生水及Si—O键,使得基片键合的表面能得到了更好的提高。测量了室温键合时间对Si-玻璃表面能力的影响以及退火时间对键合强度的影响。
