121st General Meeting of the KCS

Type Poster Presentation
Area Inorganic Chemistry
Room No. Event Hall
Time 4월 19일 (목요일) 11:00~12:30
Code INOR.P-196
Subject Anisotropic Proton Conduction in a Channel-Type Metal-Organic Framework MOF-74
Authors Dahae Song, Nak Cheon Jeong*
Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology, Korea
Abstract Often characterized by large internal surface areas and extended nanoporosity, MOFs have received attentions as potential candidates for applications in chemical separations, gas storage, chemical sensing, and ion exchanges. Recently, proton conductivities of MOFs have also received substantial attention due partly to academic curiosity about the correlation between the mobility of protons and the porosity of MOF and partly to the potentials in industrial applications for fuel cells and batteries. The demonstration of proton conductivity has been confined only to several MOFs, which possess (i) abundant proton sources in either pore or framework, (ii) large pores that contains sufficient proton-transporting medium, and most importantly (iii) high chemical stability against water and acid. However, these limitations also limit the studies for proton conductivity. For examples, anisotropy in proton conduction which correlates with the pore structure of MOFs has been rarely studied. That is due to lack of a technique to synthesize large crystals of MOFs that should be connected to electrodes prior to the study. In this poster, we will present the high anisotropy in proton conductivity of robust Co-MOF-74 which contains 1-dimensional channels along c-axis. More precisely, while the MOF-74 engenders low proton conductivity with the value of 10-6 S cm-1 when the electrodes are connected perpendicular to the c-axis, it engenders approximately three-order higher conductivity with the value of 10-3 S cm-1 when the electrodes are connected parallel to the c-axis. Further, we demonstrate that this proton conductivity can be substantially enhanced when inorganic acid or base is introduced into the MOF crystals.
E-mail sdh625@naver.com