Abstract
The room temperature ionic liquid 1‐ethyl‐3‐methylimidazolium tetrafluoroborate 
was demonstrated as a versatile electrolyte by examining three representative electrochemical couples: ferrocene and tetrathiafulvalene oxidations and lithium ion reduction. Square‐wave voltammetric data for ferrocene oxidation were fit to a reversible one‐electron process using the 
algorithm to give a half‐wave potential of 0.490 V vs. Al/Al(III) and a diffusion coefficient of 
. The two‐electron oxidation of tetrathiafulvalene was reversible and proceeded through two consecutive one‐electron steps; although data collected at lower square‐wave frequencies indicated a slow precipitation of the 
species. Lithium ion was reduced to lithium metal at a Pt electrode following the addition of water to the 
electrolyte, whereas lithium ion reduction at an Al wire produced the β‐LiAl alloy. Conductivities and kinematic viscosities of 
were measured from 20 to 100°C and had values of 
and 
, respectively, at 25°C.