title: Synthesis and conductive performance of indium-substituted ternary heteropoly acids with Keggin structures.
abstract: Two new high-proton conductors, indium-substituted ternary heteropoly acids with Keggin structures, H4[In(H2O)PW11O39]·11H2O and H5[In(H2O)SiW11O39]·8H2O, have been synthesized and characterized using elemental analysis, IR, UV, XRD and TG-DTA. Their proton conductivities were measured using electrochemical impedance spectroscopy (EIS), and the results indicate that H4[In(H2O)PW11O39]·11H2O and H5[In(H2O)SiW11O39]·8H2O are solid high-proton conductors with a conductivity of 2.60 × 10(-4) S cm(-1) and 5.25 × 10(-4) S cm(-1), respectively, at 18 °C and 80% relative humidity (RH). Their activation energies are 33.40 kJ mol(-1) and 28.52 kJ mol(-1), which suggests that the mechanism of proton conduction is the vehicle mechanism. In the range of the measured temperatures, the conductivity of both heteropoly acids increases with higher temperatures.
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China. qywu@zju.edu.cn.
authors.forename: Xuefei
authors.initials: X
authors.lastname: Wu
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China. qywu@zju.edu.cn.
authors.forename: Tianpei
authors.initials: T
authors.lastname: Huang
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China. qywu@zju.edu.cn.
authors.forename: Qingyin
authors.initials: Q
authors.lastname: Wu
authors.affiliation: Key Laboratory of Polyoxometalate Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun, 130024, PR China.
authors.forename: Lin
authors.initials: L
authors.lastname: Xu