Oxygen bases, electro generated

The oxygen reduction reaction (ORR) is the primary electrochemical reaction occurring at the cathode of a PEMFC, and is central to this promising technology for efficient and clean energy generation. The ORR is a multi-electron reaction that follows the direct four-electron mechanism on platinum-based electro-catalysts. It appears to occur in two pathways in acid electrolytes (Adzic and Lima, 2009) ... 

In this context, Rodrigo and coworkers studied the use of diamond-based electrodes to electrolyze Fe(OH)3 solutions in lOM KOH. The current efficiency obtained was very low (<0.8 %). The use of iron-powder bed as iron raw material increases the availability of oxidizable iron species and slightly improves the efficiency of the electrosynthesis with BDD [11]. Lee et al [12] observed that electrochemical generation of ferrate in acidic solution is possible using a BDD electrode. However, the electro-chemically generated ferrate undergoes rapid decomposition to produce oxygen and Fe ". ... 

Although IL electrolytes provide partial selectivity, the primary selectivity of an IL-electrochemical sensor comes from the redox properties of the analyte observed using amperometric methods, wherein the electrical current generated by reaction of an analyte at an electrode at a fixed or variable potential is measured [22]. We have shown redox chemistry that occurs only in ILs and can be exploited to enhance sensor performance [202], As shown in Fig. 2.16, we discovered that at platinum electrode in [NTf2]-based ionic liquids (ILs), facile methane electro-oxidation is observed suggesting a unique catalytic Pt-INTfj] interface for electron-transfer reaction of methane at room temperature. Little methane electro-oxidation signals are observed in ILs with other anions. In this experiment, an oxygen reduction process... 

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