Size Reduced Iron Nitroprusside Particles: an Electrochemical Mediator for the Quantification of Peroxodisulfate and Nitrite

<div><p>Iron nitroprusside (FeNP) particles have been synthesized from drop by drop (n-FeNP) and bulk mixing (BM) (b-FeNP) methods. FeNP particles obtained from both methods were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). n-FeNP particles were used in constructing modified carbon paste electrode (CPE), which has been further used for electrochemical studies. The effect of pH and electrolyte cation on the electrochemical behavior of n-FeNP modified CPE has been studied in detail. Oxidation of nitrite and reduction of peroxodisulfate reactions have been electrocatalyzed at two redox centers of n-FeNP modified CPE. Based on the electrochemical experiments conducted and Tafel plots, mechanism for both the reactions has been proposed. Both the analytes were estimated in soil and ground water samples using n-FeNP modified CPE and the results were validated with the help of standard methods.</p></div

Large-Scale Production of V₆O₁₃ Cathode Materials Assisted by Thermal Gravimetric Analysis–Infrared Spectroscopy Technology

The kilogram-scale fabrication of V₆O₁₃ cathode materials has been notably assisted by in situ thermal gravimetric analysis (TGA)–infrared spectroscopy (IR) technology. This technology successfully identified a residue of ammonium metavanadate in commercial V₆O₁₃, which is consistent with the X-ray photoelectron spectroscopy result. Samples of V₆O₁₃ materials have been fabricated and characterized by TGA–IR, scanning electron microscopy, and X-ray diffraction. The initial testing results at 125 °C have shown that test cells containing the sample prepared at 500 °C show up to a 10% increase in the initial specific capacity in comparison with commercial V₆O₁₃