Manganese(II) molybdate is an

inorganic compound In chemistry, an inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds, that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as '' inorganic chemist ...

with the chemical formula MnMoO₄. α-MnMoO₄ has a monoclinic crystal structure. It is also antiferromagnetic at low temperatures.

Synthesis

Manganese(II) molybdate can be prepared through a

double displacement A salt metathesis reaction, sometimes called a double displacement reaction, is a chemical process involving the exchange of bonds between two reacting chemical species which results in the creation of products with similar or identical bonding a ...

reaction between sodium molybdate and manganese sulphate: Manganese(II) molybdate has minimal solubility in water and will form a white-yellow precipitate which turns beige upon being refluxed. The precipitate can then be filtered from solution, which gives the monohydrate (MnMoO₄·H₂O); heating to 360 °C then provides the anhydrous salt. Manganese(II) molybdate may also be prepared by heating various manganese oxides and molybdenum trioxide to 700 °C.

Potential applications

MnMoO₄ serves as the active material in electrodes for aqueous

supercapacitors A supercapacitor (SC), also called an ultracapacitor, is a high-capacity capacitor, with a capacitance value much higher than other capacitors but with lower voltage limits. It bridges the gap between electrolytic capacitors and Rechargeable ba ...

due to fast pseudocapacitive

redox reactions Redox (reduction–oxidation, , ) is a type of chemical reaction in which the oxidation states of substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a d ...

. It has been evaluated as catalyst for hydrogen evolution.

References

Manganese(II) compounds Molybdates {{Inorganic-compound-stub