Iron(II) molybdate

Iron(II) molybdate

Names
IUPAC name Iron(II) molybdate
Identifiers
CAS Number	13718-70-2  Y
3D model (JSmol)	Interactive image
ChemSpider	13795022
PubChem CID	16217045
CompTox Dashboard (EPA)	DTXSID30584227
InChI InChI=1S/Fe.Mo.4O/q+2;;;;2*-1 Key: QQOCLJJWXLOEJE-UHFFFAOYSA-N
SMILES [O-][Mo](=O)(=O)[O-].[Fe+2]
Properties
Chemical formula	FeMoO4
Molar mass	215.78 g/mol
Appearance	Tan brown powder or crystals [1]
Density	5.6 g/cm3 (20 °C)
Melting point	1,115 °C (2,039 °F; 1,388 K)
Solubility in water	0.00766 g/100 mL (20 °C) 0.038 g/100 mL (100 °C)
Thermochemistry
Heat capacity (C)	118.5 J/mol K
Std enthalpy of formation (ΔfH⦵298)	−1075 kJ/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Iron(II) molybdate is an inorganic compound with the chemical formula FeMoO₄. ^[2]

Synthesis

Iron(II) molybdate is prepared by the reaction of iron(II) chloride or iron(II) sulfate ^[3] and sodium molybdate.

Na₂MoO₄ + FeSO₄ → Na₂SO₄ + FeMoO₄

Na₂MoO₄ + FeCl₂ → 2 NaCl + FeMoO₄

Due to its very low aqueous solubility, iron(II) molybdate precipitates out as a brown powder from the above reactions, which can then be obtained by filtration.

Applications

FeMoO₄ has been used as relatively stable active material for anodes in Li-ion batteries for conversion reaction, ^[4] as anode material in aqueous supercapacitors due to fast redox reactions ^[3] and as catalyst for oxygen evolution in alkaline solutions. ^[5]

Safety

Iron(II) molybdate is toxic and may cause irritation. It should not be released into the environment. Inhalation of dusts should be avoided.

References

1. "Iron(II) Molybdate". American Elements. Archived from the original on 2023-01-17. Retrieved 2023-01-17.
2. University of Akron Chemical Database ^{[ permanent dead link ]}
3. Senthilkumar, Baskar; Kalai Selvan, Ramakrishnan (2014-07-15). "Hydrothermal synthesis and electrochemical performances of 1.7 V NiMoO4⋅xH2O||FeMoO4 aqueous hybrid supercapacitor". Journal of Colloid and Interface Science. 426: 280–286. doi:10.1016/j.jcis.2014.04.010. PMID   24863794.
4. Zhang, Zhenyu; Li, Wenyue; Ng, Tsz-Wai; Kang, Wenpei; Lee, Chun-Sing; Zhang, Wenjun (2015-10-13). "Iron(ii) molybdate (FeMoO4) nanorods as a high-performance anode for lithium ion batteries: structural and chemical evolution upon cycling". J. Mater. Chem. A. 3 (41): 20527–20534. doi:10.1039/c5ta05723j. ISSN   2050-7496.
5. Singh, R. N.; Singh, J. P.; Singh, A. (2008-08-01). "Electrocatalytic properties of new spinel-type MMoO4 (M = Fe, Co and Ni) electrodes for oxygen evolution in alkaline solutions". International Journal of Hydrogen Energy. 33 (16): 4260–4264. Bibcode:2008IJHE...33.4260S. doi:10.1016/j.ijhydene.2008.06.008.