Research On The Controllable Synthesis, Heterostructure Construction And Electrochemical Properties Of One Dimensional Molybdates Nanomaterials

Molybdate material plays a great important role in nanotechnology application. Recent work indicates that the property of molybdate significantly depends on the morphology and scale. Hence, it is valueable to investigate the function for molybdate and its composite nanomaterial. In our work, molybdate nanomaterial has been synthesized by microemulsion and precipitation method. The crystalline structure and morphology were studied by adjusted the reaction condition, and then the formation mechanism were explored. In addition, three dimension hierachical heterostructure MnMoO4/CoMoO4 have been fabricated for discussing the electrochemical property. In this article, the essential connection between the nanostructure and property was explored, and then could provide therotical support for molybdate in electrochemistry field. The main contents and results are as follows:MnMoO4 nanomaterial was synthesized in ternary microemulsion system and quaternary microemulsion system. XRD and SEM analysis illustrate the appearance of MnMoO4 could be related to different microemulsion systems. The solvent pH value and temperature exhibit significant influence to the product. The XRD patten shows that MnMoO4 nanorod can be obtained while pH value is 6-8. From the SEM image, the formation process can be explained by Ostwald Ripening Process. MnMoO4 nanotube was obtained in quaternary microemulsion system, and the formation process of nanotube can be explained by curling mechanism. In the same mircoemulsion system, the CoMoO4 nanorod with a diameter of 300nm was found which is self-assembled by CoMoO4 nanoparticle. The growth direction of CoMoO4 nanorod could be controled by the dosage of template in precipitation method. In this paper, hierarchical MnMoO4/CoMoO4 heterostructured nanowires were controllably synthesized by a simple refluxing method under mild conditions with the back-bone material of MnMoO4 nanorods and the CoMoO4 shell thickness could be tuned by changing the molar ratio of Mn source and Co source. The capacitance for hierarchical MnMoO4/COMoO4 heterostructured nanowires is significantly higher than that for the pure 1D nanorod. And MnMoO4/CoMoO4 heterostructured nanowire electrode exhibited good reversibility with cycling efficiency of 98% after 1000 cycles.