Abstract
We report on the synthesis of a nano cobalt complex potassium nitratopentacyanocobaltate (III) (K 3[Co(CN) 5NO 3]) 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) 5NO 3] 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 R ct = 0.52 Ωcm 2 which was 12 times greater than that of the bare EPPGE (R ct = 6.42 Ωcm 2). 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 (NO 2 - 2) and nitric oxide (NO) respectively, than the current at the bare EPPGE . The nano cobalt complex was simple to prepare, environmental frielectrodeendly and should be a potential catalyst for sensors, semiconductors and energy storage devices applications.
| Original language | English |
|---|---|
| Pages (from-to) | 2904-2917 |
| Number of pages | 14 |
| Journal | International Journal of Electrochemical Science |
| Volume | 7 |
| Issue number | 4 |
| Publication status | Published - 2012 |
Keywords
- Electron transfer kinetics
- Impedance spectroscopy
- Nano cobalt complex
- Nitrite oxidation
- Pseudocapacitance
ASJC Scopus subject areas
- Electrochemistry