K. Ding,a,c,*Q. Wanga and M. Zhaob
aChemistryCollege, Hebei Teacher’s University, Shijiazhuang 050016, P. R . China
bHuihua College, Teacher’s University, Shijiazhuang 050091, P. R . China
cDepartment of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8502, Japan
Abstract
In this preliminary work, for the first time, the electrochemical oxygen reduction reaction (ORR) was investigated using cyclic voltammetry (CV) on the electrodeposited manganese oxide (MnOx)-modified glass carbon electrode (MnOx-GC) at room temperature ionic liquids (RTILs) of EMIBF4, i.e., 1-ethyl-3-methylimidazolium tetrafluorobroate (EMIBF4). The results demonstrated that, after being modified by MnOx on GC, the reduction peak current of oxygen was increased to some extent, while the oxidation peak current, corresponding to the oxidation of superoxide anion, O2-, was attenuated in some degree, suggesting that MnOxcatalyzed ORR in RTILs of EMIBF4, which is consistent with the results obtained in aqueous solution. To accelerate the electron transfer rate, multi-walled carbon nanotubes (MWCNTs) were modified on GC, and then MnOx was electrodeposited onto the MWCNTs-modified GC electrode to give rise to the MnOx /MWCNTs–modified GC electrode; consequently, the improved standard rate constant, κs,originated from the modified MWCNTs, along with the modification of electrodeposited MnOx, showed us a satisfactory electrocatalysis for ORR in RTILs of EMIBF4. In addition, not only for the MnOx-modified GC but also for the MnOx/ MWCNTs-modified GC, there is a novel small oxidation peak appearing at –0.2 V vs. solid Ag/AgCl, implying that the catalysis of MnOx for ORR in EMIBF4 is somewhat different from that observed in aqueous solution, though the exact interpretation is not achieved in this preliminary work. Initiating the catalysis of MnOxon ORR in RTILs is the main contribution of this work. Further discussions are in progress.
]]>Keywords: manganese oxide (MnOx), multi-walled carbon nanotubes (MWCNTs), room temperature ionic liquids (RTILs), electrochemical oxygen reduction reaction (ORR), glass carbon (GC) electrode.
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* Corresponding author. E-mail address: dkeqiang@263.net
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