Manganese(II) molybdate is an inorganic compound with the chemical formula MnMoO4. α-MnMoO4 has a monoclinic crystal structure.[2] It is also antiferromagnetic at low temperatures.[3]
Synthesis
Manganese(II) molybdate can be prepared through a double displacement reaction between sodium molybdate and manganese sulphate:[1]
Manganese(II) molybdate has minimal solubility in water and will form a white-yellow precipitate which turns beige upon being refluxed.[1] The precipitate can then be filtered from solution, which gives the monohydrate (MnMoO4·H2O); heating to 360 °C then provides the anhydrous salt.[1]
Manganese(II) molybdate may also be prepared by heating various manganese oxides and molybdenum trioxide to 700 °C.[4]
Potential applications
MnMoO4 serves as the active material in electrodes for aqueous supercapacitors[2][5] due to fast pseudocapacitive redox reactions. It has been evaluated as catalyst for hydrogen evolution.[5]
References
- ^ a b c d Clearfield, A.; Moini, A.; Rudolf, P. R. (1985-12-01). "Preparation and Structure of Manganese Molybdates". Inorganic Chemistry. 24 (26): 4606–4609. doi:10.1021/ic00220a035.
- ^ a b "Synthesis and Characterization of Manganese Molybdate for Symmetric Capacitor Applications (PDF Download Available)". ResearchGate. Retrieved 2017-03-10.
- ^ Ehrenberg, H.; Schwarz, B.; Weitzel, H. (2006-10-01). "Magnetic phase diagrams of -MnMoO4". Journal of Magnetism and Magnetic Materials. 305 (1): 57–62. doi:10.1016/j.jmmm.2005.11.027.
- ^ Doyle, W. P.; McGuire, G.; Clark, G. M. (1996-05-01). "Preparation and Properties of Transition Metal Molybates (VI)". Inorganic and Nuclear Chemistry. 28 (5): 1185–1190. doi:10.1016/0022-1902(66)80444-X.
- ^ a b Yan, Xiaodong; Tian, Lihong; Murowchick, James; Chen, Xiaobo (2016-03-01). "Partially amorphized MnMoO4for highly efficient energy storage and the hydrogen evolution reaction". J. Mater. Chem. A. 4 (10): 3683–3688. doi:10.1039/c6ta00744a. ISSN 2050-7496.