University of PardubiceFaculty of Chemical Technology

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Proton conductivity behaviour of aluminum biphenyl-4,4‘- dicorboxylate studied by impedance spectroscopy with random-walk approach

Authors: Konale Manisha Swarup | Patil Deepak | Lin Chia-Her | Zima Vítězslav | Wágner Tomáš | Shimakawa Koichi

Year: 2014

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Proton conductivity behaviour of aluminum biphenyl-4,4‘- dicorboxylate studied by impedance spectroscopy with random-walk approach	"Al(OH)(bpdc), an aluminum metal-organic framework (MOF) compound, has been synthesized under solvothermal conditions from an aluminum salt and biphenyl-4,4’-dicarboxylic acid (H2bpdc), using N,N-dimethylformamide as a solvent which affects porosity and the flexibility of the network [1]. Its structure consists of chains built of aluminum coordination octahedra bridged by bpdc linkers. This compound has a high permanent porosity. Due to presence of water molecules in the pores this compound is a moderate proton conductor. We studied the proton conductivity of this MOF as a function of relative humidity and we determined its conductivity using impedance spectroscopy (IS). We evaluated its data by a traditional equivalent electrical circuit approach, and we use a new approach called random-walk (RW) approach [2,3]. We found that conductivity increase exponentially with relative humidity of surrounding atmosphere. From the comparison of conductivity values calculated from the equivalent electric circuit and RW approaches we found that the RW approach is applicable for the evaluation of the IS data of our material. Using RW approach we got also other parameters such as number of charge carriers and diffusion coefficient and we determined their dependence on relative humidity. The thermal dependence of conductivity was also studied with the aim to determine the activation energy of the conductivity process. "	proton conductivity, impedance analysis