Iron(II) chloride tetrahydrate

• CAS: 13748-10-9
• Catalog Number: ACM13748109
• Category: Main Products
• Molecular Weight: 198.81
• Molecular Formula: FeCl2·4H₂O
• IUPAC Name: 11-[3-(dimethylamino)propyl]-5,6-dihydrodibenzo[1,2-a:1',2'-e][7]annulen-11-ol
• Canonical SMILES: CN(C)CCCC1(C2=CC=CC=C2CCC3=CC=CC=C31)O
• InChI Key: ONSQUXZPOPTSQF-UHFFFAOYSA-N
• Appearance: light green crystalline powder
• EC Number: 214-594-6

Case Study

Iron(II) Chloride Tetrahydrate Electrolyte for Redox Flow Battery

Manohar, Aswin K., et al. Journal of the electrochemical society, 2015, 163(1), A5118.

A membrane-based iron chloride redox flow rechargeable battery is reported, which has demonstrated a high charging efficiency of 97% by maintaining the pH of the negative electrode electrolyte at 2 and using indium chloride as an electrolyte additive. In this battery system, the composition of the positive electrolyte used was a mixture of 3 M iron (II) chloride tetrahydrate and 2 M ammonium chloride in order to measure the Faradaic efficiency of iron electrodeposition in various electrolytes.
Faradaic efficiency of iron deposition
· The half-cell setup included a rotating disk electrode made of glassy carbon, a silver/silver chloride (Ag/AgCl) reference electrode, and a platinum wire counter electrode. The electrolyte consisted of a 3 M aqueous solution of iron (II) chloride tetrahydrate mixed with 2 M of ammonium chloride to enhance conductivity. Various additives, such as ascorbic acid, citric acid, indium chloride, and bismuth oxychloride, were tested in the electrolyte.
· To prevent the oxidation of ferrous ions to ferric ions, the electrolyte was de-aerated and kept under argon gas during preparation and electrochemical testing. The glassy carbon electrode was rotated at 2500 rpm throughout the experiments to promote effective transport of ferrous ions. Testing was conducted with a PAR VMC-4 potentiostat.
· Faradaic efficiency for iron deposition was assessed by applying different current densities (10-300 mA/cm2) to plate iron onto the glassy carbon electrode, followed by anodic galvanostatic stripping at 60 mA/cm² until reaching a potential of 0 V vs the Ag/AgCl reference.

Synthesis of Nanocrystalline Iron Particles from Iron(II) Chloride Tetrahydrate

Ebin B, Gürmen S. et al. Metall-Heidelberg, 2011, 65(4), 151.

Nanocrystalline iron particles were successfully prepared by combining ultrasonic spray pyrolysis and hydrogen reduction with iron(II) chloride tetrahydrate (FeCl2·4H2O) aqueous solution as raw material. Spherical nanocrystalline iron powders with crystallite sizes ranging from 23 to 33 nm were obtained at different reaction temperatures (600-1000°C) and solution concentrations (0.08-0.2 M).
Preparation procedure
· Precursor solutions were created by dissolving iron (II) chloride tetrahydrate (FeCl2·4H2O) in distilled water, yielding iron ion concentrations of 0.2 and 0.08 M. An ultrasonic nebulizer was used to atomize the precursor solution, resulting in very fine aerosol droplets.
· These droplets were then transported via a quartz tube to a heated furnace using hydrogen as a carrier and reduction gas. The selected reaction temperatures were 600 °C and 1,000 °C. Nitrogen was introduced at a flow rate of 1.0 l/min both before and after the reduction process to eliminate oxygen and maintain an inert environment.
· Within the quartz tube reactor, under spray pyrolysis conditions in a hydrogen atmosphere with a constant flow rate of 1.0 l/min, a continuous reduction process occurred in the 250 mm heated section. The particles formed were collected at the furnace outlet using washing bottles filled with ethanol, and subsequently, the particles were centrifuged and washed multiple times with ethanol.

Custom Reviews

August 25, 2023

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Preparation of chemical catalyst
Through chemical synthesis, iron(II) chloride tetrahydrate can prepare high-efficiency metallic iron catalyst.