Abstract
The participation of cations in redox reactions of manganese oxides provides an opportunity for development of chemical sensors for non-electroactive ions. A sensor based on a nanostructured hollandite-type manganese oxide was investigated for voltammetric detection of potassium ions. The detection is based on the measurement of anodic current generated by oxidation of Mn(III) to Mn(IV) at the surface of the electrode and the subsequent extraction of the potassium ions into the hollandite structure. In this work, an amperometric procedure at an operating potential of 0.80 V (versus SCE) is exploited for amperometric monitoring. The current signals are linearly proportional to potassium ion concentration in the range 4.97 × 10−5 to 9.05 × 10−4 mol L−1, with a correlation coefficient of 0.9997.
Highlights
Potassium monitoring in serum, urine, and foods is very important in the clinical and medical fields, being one of the most important routine analysis performed in a clinical laboratory [1]
The preparation, properties and application of an electrochemical sensor based on hollandite-type MnO2 for the amperometric determination of potassium ions was studied
The width peaks in the X-ray diffractograms (XRD) pattern of the sample synthesized by sol-gel suggests that the oxide powder shows higher degree of crystallinity when compared to the sample synthesized by redox precipitation
Summary
Urine, and foods is very important in the clinical and medical fields, being one of the most important routine analysis performed in a clinical laboratory [1]. The development of chemical sensors for non-electroactive species has been proposed based on the participation of non-electroactive cations in redox reactions of metal hexacyanoferrates [8] Another compound with the ability of accommodate non-electroactive cations and promote the electroactivity in function of the insertion cation is manganese oxide. Manganese oxides represent a large class of materials that have layered and tunneled nanostructures consisting of edge-shared MnO6 octahedral units. They have attracted considerable interest due to their broad potential applications in heterogeneous catalysis, chemical sensing, and rechargeable battery technology [9,10]. The preparation, properties and application of an electrochemical sensor based on hollandite-type MnO2 for the amperometric determination of potassium ions was studied. The amperometric measurements realized are based on the topotactic electrochemical reaction of insertion/extraction of the non-electroactive cation in the hollandite structure
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