%0 Journal Article
%T In Situ X-ray Photoelectron Spectroscopic and Electrochemical Studies of the Bromide Anions Dissolved in 1-Ethyl-3-Methyl Imidazolium Tetrafluoroborate
%A Arvo T£¿nisoo
%A Enn Lust
%A Ergo N£¿mmiste
%A Jaanus Kruusma
%A Rainer P£¿rna
%J Archive of "Nanomaterials".
%D 2019
%R 10.3390/nano9020304
%X Influence of electrode potential on the electrochemical behavior of a 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4) solution containing 5 wt % 1-ethyl-3-methylimidazolium bromide (EMImBr) has been investigated using electrochemical and synchrotron-initiated high-resolution in situ X-ray photoelectron spectroscopy (XPS) methods. Observation of the Br 3d5/2 in situ XPS signal, collected in a 5 wt % EMImBr solution at an EMImBF4¨Cvacuum interface, enabled the detection of the start of the electrooxidation process of the Br£¿ anion to Br3£¿ anion and thereafter to the Br2 at the micro-mesoporous carbon electrode, polarized continuously at the high fixed positive potentials. A new photoelectron peak, corresponding to B¨CO bond formation in the B 1s in situ XPS spectra at E ¡Ü £¿1.17 V, parallel to the start of the electroreduction of the residual water at the micro-mesoporous carbon electrode, was observed and is discussed. The electroreduction of the residual water caused a reduction in the absolute value of binding energy vs. potential plot slope twice to ca. dBE dE£¿1 = £¿0.5 eV V£¿1 at E ¡Ü £¿1.17 V for C 1s, N 1s, B 1s, F 1s, and Br 3d5/2 photoelectrons
%K room temperature ionic liquids
%K in situ X-ray photoelectron spectroscopy
%K binding energies
%K cyclic voltammetry
%K electrochemical impedance spectroscopy
%K micro-mesoporous carbon electrode
%K supercapacitor materials
%U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6409973/