Characterization of a Nano-synthesised Cobalt Complex and its Electrocatalytic Properties towards Nitrite Oxidation

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We report on the synthesis of a nano cobalt complex potassium nitratopentacyanocobaltate (III) (K3[Co(CN)5NO3]) made by a simple green chemistry method. The synthesized complex was characterized using FTIR. UV-Vis, XRD. EDX. HRSEM. And TEM. Techniques. Electron transfer behaviour of the [Co(CN)5NO3]3-complex on an electrode support was investigated in a ferrocyanide/ferricyanide (Fe(CN)6]4- / [Fe(CN)6]3-) redox probe using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The EIS. Study in Fe(CN)6]4- / [Fe(CN)6]3-redox probe showed that nano cobalt complex modified edge plane pyrolytic graphite electrode (EPPGE-Co) exhibit faster electron transfer with a charge transfer resistance of Rct = 0.52 Ωcm2 which was 12 times greater than that of the bare EPPGE. (Rct = 6.42 Ωcm2). The equivalent circuit used demonstrated the pseudocapacitive and the lower capacitance of the EPPGE-Co electrode compared to the EPPGE. The EPPGE-Co showed an enhanced catalytic current (3 and 7 folds higher) in nitrite (NO2-) and nitric oxide (NO) respectively, than the current at the bare EPPGE. Electrode. The nano cobalt complex was simple to prepare, environmental friendly and should be a potential catalyst for sensors, semiconductors and energy storage devices applications.