Hiroki Aoyagi, Masaya Okamura, Mika Fukunishi, Shiro Hikichi, Futoshi Matsumoto
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Generation of superoxide ions in the electrochemical reduction of molecular oxygen in concentrated lithium bis(trifluoromethanesulfonyl)imide aqueous solutions
Electrolytic generation of superoxide ions (O2•-) from the reduction of molecular oxygen (O2) was previously successful only by the formation of a hydrophobic reaction field on an electrode surface. However, in our study, O2•- was generated in concentrated lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) aqueous solutions that can be confirmed electrochemically or spectroscopically. In the concentrated LiTFSI aqueous solution, O2•- was more stable than it is in normal aqueous solutions, but it was not as stable as it is in organic solvents. When other related-concentrated electrolyte solutions are used, the electrolysis of O2•- greatly varies depending on the types of cations and anions used as electrolytes. Thus, a synergistic effect of reducing free water with cations and creating a hydrophobic atmosphere with anions was achieved.
期刊介绍:
Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.