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恭喜肖成梁老师在Chem. Eur. J.上发表文章!

日期:2015-9-18 12:34:38 人气:595 

恭喜肖成梁老师关于采用阴离子交换法改性阳离子骨架材料提高质子导体性能的文章在Chem. Eur. J.上发表!

Chengliang Xiao, Yaxing Wang, Lanhua Chen, Xuemiao Yin, Jie Shu, Daopeng Sheng, Zhifang Chai, Thomas E. Albrecht-Schmitt, and Shuao Wang*, Boosting proton conductivity in highly robust three-dimensional inorganic cationic extended frameworks through ion exchange with dihydrogen phosphate anions, Chemistry-A European Journal, 2015, accepted.

Abstract: The limited long-term hydrolytic stability of rapidly emerging three-dimensional (3D) extended framework materials (MOFs, COFs, MOPs, etc.) is still one of major barriers for their practical applications as new solid state electrolytes in fuel cells. To obtain hydrolytically stable materials, two H2PO4--exchanged 3D inorganic cationic extended frameworks (CEFs) were successfully prepared by a facile anion exchange method. Both anion-exchanged CEFs (YbO(OH)P and NDTBP) show significantly enhanced proton conductivity when compared with the original materials (YbO(OH)Cl and NDTB) with increasing of up to four orders-of-magnitude, reaching 2.36×10-3 and 1.96×10−2 S cm−1 at 98% RH and 85 °C for YbO(OH)P and NDTBP, respectively. These values are comparable to the most efficient proton conducting MOFs. In addition, these two anion-exchanged materials are stable in boiling water originated from the strong electrostatic interaction between the H2PO4- anion and the cationic host framework, showing a clear advance over all the acid-impregnated materials (H2SO4@MIL-101, H3PO4@MIL-101, and H3PO4@Tp-Azo) as practical solid state fuel cell electrolytes. This work offers a new general and efficient approach to functionalize 3D extended frameworks through an anion-exchange process and achieves water-stability with ultra-high proton conductivity above 10-2 S cm-1.

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