pH-Dependent Proton Conducting Behavior in a Metal-Organic Framework Material

被引：198
作者：
Phang, Won Ju [1 ]
Lee, Woo Ram [1 ]
Yoo, Kicheon [2 ]
Ryu, Dae Won [1 ]
Kim, BongSoo [2 ]
Hong, Chang Seop [1 ]
机构：
[1] Korea Univ, Dept Chem, Seoul 136713, South Korea
[2] Korea Inst Sci & Technol, Photoelect Hybrids Res Ctr, Seoul 136791, South Korea
来源：
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2014年 / 53卷 / 32期
关键词：
metal-organic frameworks; proton conducting materials; protonated water clusters; COORDINATION POLYMER; TRANSPORT;
D O I：
10.1002/anie.201404164
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A porous metal-organic framework (MOF), [Ni-2-(dobdc)(H2O)2]center dot 6H(2)O (Ni-2(dobdc) or Ni-MOF-74; dobdc(4) = 2,5-dioxido-1,4-benzenedicarboxylate) with hexagonal channels was synthesized using a microwave-assisted solvothermal reaction. Soaking Ni-2(dobdc) in sulfuric acid solutions at different pH values afforded new proton-conducting frameworks, H@Ni-2(dobdc). At pH 1.8, the acidified MOF shows proton conductivity of 2.2 x 10(-2) S cm(-1) at 80 degrees C and 95% relative humidity (RH), approaching the highest values reported for MOFs. Proton conduction occurs via the Grotthuss mechanism with a significantly low activation energy as compared to other proton-conducting MOFs. Protonated water clusters within the pores of H@Ni-2(dobdc) play an important role in the conduction process.
引用
收藏
页码：8383 / 8387
页数：5
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