Electrochemical Behavior of Iron(II) Species in a Hydrophobic Room-temperature Molten Salt

抄録

The electrochemical behaviors of divalent iron species were investigated in a room-temperature molten salt (RTMS) consisting of 1-n-butyl-1-methylpyrrolidinium cation (BMP⁺) and bis(trifluoromethylsulfonyl)imide (TFSI⁻) anion. The TFSI⁻-salt of Fe(II) was soluble in BMPTFSI at room temperature. The cyclic voltammetric data for the Fe(III/Fe(II) processes at 1.1 V vs. Ag/Ag(I) showed quasi-reversible kinetics on a platinum electrode. The diffusion coefficient of Fe(II) determined by chronoamperometric techniques was 9.7 × 10⁻⁸ cm² s⁻¹ at 25°C. After cathodic reduction of Fe(II) at −2.0 V, furthermore, metallic Fe was electrodeposited on a copper substrate.