Kinetic study on regeneration of FeIIEDTA in the wet process of NO removal

Ferrous-based electrolyte for simultaneous NO absorption and electroreduction to NH3 using Au/rGO electrode.

Rechargable xLi2MnO3·(1 − x)Li4/3Mn5/3O4 electrode nanocomposite material as a modification product of chemical manganese dioxide by lithium additives

A new type of quartz crystal nano-balance (QCN) has been designed using ruthenium oxide (RuO2) electrodes as substitutes for the metallic ones, which are generally used to prepare QCN sensors. The conductive RuO2 electrodes were deposited on quartz discs using reactive magnetron sputtering. XPS measurements showed the ratio of atomic concentrations [Ru]/[O] close to 1:2. XRD indicated crystalline structure of the deposits and AFM showed highly developed surface with pits and other features of various sizes. The oxide-based resonator operated stable in both gaseous and liquid environments as demonstrated by the prolonged experiments of water adsorption–absorption in humid air and electrochemical copper deposition–dissolution in acid solution. The sensor opens new opportunities to study thin films of RuO2. One of the advantages of the sensor is possibility to avoid the galvanic effects, which may occur when using the conventional QCN with metallic electrodes.

Ruthenium dioxide quartz crystal nano-balance

http://jes.ecsdl.org/content/164/4/A937.full.pdf

Multi-Phase Li-Mn-O Nanocomposite Synthesized by Oxidation Reaction for Lithium Ion Batteries

The Fe(II)-ethylenediaminetetraacetic acid (EDTA)-NO complex formed by interaction of gaseous nitrous oxide (ca. 200 ppm) and Fe(II)-EDTA in aqueous solution was found to be convert3ed electrochemically on platinum electrodes at potentials below ca. {minus}0.6 V{sub SCE}, indicating the cathodic reduction of NO. In addition to the previous studies by which the indirect conversion of NO with dithionite as a redox mediator was confirmed, the present results should elucidate the possibility of the direct electrochemical conversion of NO in mediator-free solutions. To clearly separate this process from other reactions in the system, the electrochemical behavior of Fe(II)-EDTA and Fe(III)-EDTA was studied over a wide potential range at different pH values. Five electrode reactions could be identified, which include the oxidation/reduction of Fe{sup 2+}/Fe{sup 3+} in the EDTA complex, the reduction of EDTA, the reduction of protons, the cathodic deposition of iron, and the anodic decomposition of EDTA. The electrochemical deposition of iron from Fe(II)-EDTA at potentials E < {minus}1.0 V{sub SCE} was confirmed by electrochemical quartz crystal microbalance measurements and energy-dispersive x-ray analysis.

K. Jüttner

Papers

Electrochemical Study of NO Conversion from Fe(II)‐EDTA‐NO Complex on Pt Electrodes