Cathodic Reduction Mechanisms of Manganese Dioxide from Derivative Discharge Curves

1976 ◽  
Vol 123 (8) ◽  
pp. 1123-1127 ◽  
Author(s):  
H. E. L. G. Schweigart ◽  
C. R. A. Clauss
Keyword(s):  
Manganese Dioxide ◽  
Cathodic Reduction ◽  
Reduction Mechanisms ◽  
Discharge Curves

scholarly journals STUDY ON THE PREPARATION OF MANGANESE DIOXIDE VIA CATHODIC ELECTROLYSIS

2018 ◽  
Vol 55 (5B) ◽  
pp. 34
Author(s):  
Trung Dung Dang
Keyword(s):  
Manganese Dioxide ◽  
Potassium Permanganate ◽  
Electrolyte Solution ◽  
Synthesis Method ◽  
Solution Concentration ◽  
Cathodic Reduction ◽  
Solution Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cathodic Electrolysis

A novel synthesis method was developed to prepare manganese dioxide via cathodic electrolysis in potassium permanganate solution. The morphology and the composition of the synthesized products were analyzed by scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction spectroscopy (XRD). The electrolyzed products include two kinds of materials: amorphous and crystalline manganese dioxide. The manganese dioxides were formed by cathodic reduction via two reaction mechanisms: direct and indirect electrochemical reactions. The electrolysis current performance strongly depends on the electrolyte solution temperature, applied voltage and not clearly depends on electrolyte solution concentration. With high current performance and uniformity products, the cathodic reduction of potassium permanganate is promising method for manganese dioxide fabrication.  

Voltammetry of resazurin at a mercury electrode

2010 ◽  
Vol 64 (3) ◽  
Author(s):  
Semiha Çakir ◽  
Emine Arslan
Keyword(s):  
Square Wave Voltammetry ◽  
Mercury Electrode ◽  
Stripping Voltammetry ◽  
Cathodic Reduction ◽  
Reduction Peak ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Reduction Mechanisms ◽  
Electrochemical Parameters ◽  
Catalytic Hydrogen

AbstractElectrochemical behavior of resazurin on HMDE in Britton-Robinson (B-R) buffers (pH 2.0–10.0) was studied using the square-wave voltammetry (SWV), square-wave adsorptive stripping voltammetry (SWAdSV), and cyclic voltammetry (CV) techniques. The voltammogram of resazurin in B-R buffer at pH < 4.0 exhibited two cathodic reduction peaks. The voltammetric peaks were obtained at −0.144 V (reversible) and −1.250 V (irreversible) at pH 3.2, and correspond to the reduction of resorufin to dihydroresorufin and to the catalytic hydrogen wave, respectively. At pH > 4.0, a new irreversible cathodic reduction peak, assigned to the protonation of N-oxide on the phenoxazin ring, was observed. Electrochemical parameters (I p/E p, I p/v, I p/pH, I p/t acc) of the compound were determined. From the voltammetric data, electrochemical reduction mechanisms for all peaks have been suggested. Maximum peak current for the reversible peak was obtained at pH 4.1. A linear relationship between the current and concentration was determined, and also the lowest detection limit was found as 3.25 × 10−8 mol L−1 and 1.98 × 10−10 mol L−1 for SWV and SWAdSV, respectively.

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