Dimethyl ether

The chemicals used in the experiments had the following purities as given by the manufacturer and were used as supplied: nitrogen (Air Liquid, 99.999%), synthetic air (Air Liquid, 99.999%), Cl 2 (Messer Griesheim, 2.8), ethyl glycolate (Sigma-Aldrich, 98%), ethylene (Sigma-Aldrich, ≥99.5%), dimethyl ether (Sigma-Aldrich, 99%), Z-1,2dichloroethylene (Sigma-Aldrich, 97%), trichloroethylene (Supelco, 98%), and cyclopentane (Thermo Scientific Chemicals, 95%).
The initial concentrations (in ppm) used in the experiments were 1 (in FTIR) and 6 (in GC-FID) for EG, 2.4 for ethylene, 2.4 for dimethyl ether, 8 for Z-1,2-dichloroethylene, 7 for trichloroethylene, and 6.5 for cyclopentane. (1 ppm = 2.46 × 10 13 molecule cm -3 at 298 K and 760 Torr of total pressure).
The reactants were monitored at the following absorption frequencies in the infrared spectra (cm -1 ): EG at 1100; ethene at 950; and dimethyl ether at 1178.

Dimethyl ether (99%) was obtained from Sigma-Aldrich. The salts lithium bis(fluorosulfonyl)imide (99.9%) and lithium bis(trifluoromethane)sulfonimide (99.9%) were purchased from BASF and lithium tetrafluoroborate was purchased from Sigma-Aldrich. Fabrication of 50 mg cm -2 CFx cathodes was accomplished by forming and rolling a dough. First carbon black (Super-P) was mixed with a commercial carbon fluoride (Advanced Research Chemicals, ARC-5-R-175) in a 5:95 wt% ratio by using a mortar and pestle. Once thoroughly mixed, 5.6 wt% Teflon (60 wt% suspension in H2O, Sigma-Aldrich) was added dropwise to the powder mixing via mortar and pestle continued. With addition of binder the powder began to agglomerate, although not all powder adhered into one mass. To ensure a proper dough another 6.5 wt% of Teflon (wt% including previous Teflon addition)
was mixed in with mortar and pestle. A small amount of isopropyl alcohol was used to wet the mixture and facilitate spread of Teflon among the carbon and CFx powders. Approximately 10 min of hand mixing after the second Teflon addition a dough formed that was free standing and did not shed powder. The dough was then rolled on a glass slab with a glass rolling pin to a thickness of ~0.5 mm and then dried at 80℃ for 12 hr.