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| 1 | 高强度、超疏水聚对苯撑苯并二噁唑纳米透波复合纸显示文摘聚对苯撑苯并二噁唑纳米透波复合纸在航空/航天、交通运输和5G通讯等领域具有广阔的应用前景.然而,透波复合纸内的聚对苯撑苯并二噁唑纳米纤维(PNF)间的相互作用力较低,且表面疏水性较差使其难以服役暴雨、冰雪、盐雾等恶劣自然环境.基于此,本文通过引入铁离子在PNF间构建金属配位键,并采用溶胶-凝胶薄膜转化法制备高强度聚对苯撑苯并二噁唑纳米透波复合纸,再将聚四氟乙烯(PTFE)颗粒喷涂到表面,经热处理得到双层结构的PTFE-P/PNF纳米透波复合纸.基于金属配位键的作用以及PTFE颗粒的引入,PTFE-P/PNF纳米透波复合纸具有卓越的拉伸强度(271.6 MPa)、优异的超疏水(与水的接触角为151o)和自清洁性能.此时,PTFE-P/PNF纳米透波复合具有出色的透波性能,当电磁波从透波复合纸两侧入射时,其透波率均>95%.这种兼具高强度、超疏水和自清洁的透波复合纸在雷达天线罩、电磁窗等领域有着巨大的应用潜能. | 唐林 唐玉生 张军亮 林予涵 孔杰 周琨 顾军渭 | 2022 | Science Bulletin2022，67，21： | 4 |
| 2 | Hydrophobic perfluoroalkane modified metal‐organic frameworks for the enhanced electrocatalytic reduction of CO_(2)显示文摘The electrochemical reduction of CO_(2) to value‐added chemicals would be an efficient way to utilize CO_(2) and mitigate greenhouse gas emission.However,the associated competitive hydrogen evolution reaction(HER)in aqueous electrolytes usually leads to poor selectivity for the CO_(2) electroreduction reactions(CO_(2)RR).Due to their high specific surface areas and tunable single active sites,metal‐organic frameworks(MOFs)are considered as promising candidates for CO_(2)RR.Herein,the Fe‐porphyrin based Zr‐MOF,PCN‐222(Fe),was treated with perfluorocarboxylic acid to afford the hydrophobic Fn‐PCN‐222(Fe)(n=5 and 7,n is the number of fluorine atoms in the perfluoroalkyl chain)for improving the selectivity CO_(2)RR via inhibiting the HER.Owing to the single active Fe sites were positioned in a hydrophobic microenvironment,the optimal F5‐PCN‐222(Fe)shows a high Faradic efficiency of 97%toward production of CO at−0.7 V versus reversible hydrogen electrode.Meanwhile,F5‐PCN‐222(Fe)achieved a high turnover frequency value of 3850 h−1 at−0.8 V,which was almost 3.6 times higher than that of PCN‐222(Fe)and surpassed most of other reported MOFs.This study paves a new way to improve the selectivity of the CO_(2)RR via inhibiting the associated HER by increasing the hydrophobicity of the electrocatalysts. | Xu Yang Qiu‐Xia Li Shao‐Yi Chi Hong‐Fang Li Yuan‐Biao Huang Rong Cao | 2022 | SmartMat2022，3，1： | 1 |
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