Journal: Nature Communications
Article Title: Ambient methane functionalization initiated by electrochemical oxidation of a vanadium (V)-oxo dimer
Figure Lengend Snippet: Electrocatalytic kinetics. a The logarithmic of partial current density for CH 4 functionalization, log( j CH4 ), versus the logarithmic of 1 ’s concentration, log([ 1 ]). b Log( j CH4 ) vs. E under CH 4 pressures of 1 bar (blue) and 3 bar (red) with the fitted Tafel slopes displayed. c Log( j CH4 ) vs. the logarithmic of CH 4 pressure, log( p CH4 ). d The natural logarithmic of partial current density for CH 4 functionalization, ln( j CH4 ), vs. inverse of temperature, T −1 , at 1.955 V (black), 2.005 V (blue), and 2.055 V (red) vs. Hg 2 SO 4 /Hg, respectively. The corresponding apparent activation energies ( E a ) are displayed. Unless noted specifically, 25 °C, 10 mM 1 in 98% H 2 SO 4 , E = 2.255 V vs. Hg 2 SO 4 /Hg, p CH4 = 1 bar, data recorded from 6-h bulk electrolysis.
Article Snippet: The relationship is E (V vs. Hg2 SO4 /Hg) = E (V vs. Pt) + 0.755 V. The gas environment of the electrochemical cell was controlled either CH4 (Airgas, 99.5%) or N2 (Airgas, 99.999%), which were bubbled into the reactor at rates of 7.2 (CH4 ) and 10 (N2 ) standard cubic centimeters per minute (sccm) with the use of a mass flow controllers (Omega Engineering, Inc., FMA5510A).
Techniques: Concentration Assay, Activation Assay, Electrolysis